Kenwood TM-3530A User manual

TM-3530A
TM-2570A
TM-2530A
INSTRUCTION
MANUAL
TRIO-KENWOOD
CORPORATION
/\NA>

Thank you for purchasing the new TM-3530A/2570A/2550A/2550E/2530A trans-
ceiver. Please read this instruction manual carefully before placing your transceiver in
service. This unit has been carefully engineered and manufactured to rigid quality stan-
dards, and should give you satisfactory and dependable operation for many years.
This Instruction Manual covers the following models:
TM-3530A 220 MHz FM transceiver with KENWOOD brand.
TM-2570A 144 MHz FM transceiver with KENWOOD brand.
TM-2550A 144 MHz FM transceiver with KENWOOD brand.
TM-2550E 144 MHz FM transceiver with KENWOOD brand. (Europe version)
*TM-2550E 144 MHz FM transceiver with TRIO brand. (England version)
TM-2530A 144 MHz FM transceiver with KENWOOD brand.
*in the U.K. the TM-2550E is available under the brand name “TRIO”. The
TM-3530A/2570A/2550A/2550E/2530A with KENWOOD brand appearing in
this instruction manual is not sold in the U.K., as they are made to a different market
specification.
When there are differences in operation separate instructions will be given for each
model. Ilustrations show the TM-2550A.
The following explicit definitions apply in this manual:
Note: \f disregarded, inconvenience only, no risk of equipment damage or personal
injury.
Caution: Equipment damage may occur, but not personal injury.
4-1, CONTROLS AND THEIR FUNCTIONS..
4-1-1, Front panel
1. LCD group....
2. Keyboard..
4-1-2. Rear pane! ..
4-1-3. Microphone
4-2, RECEPTION........
4-3. TRANSMISSION ...
4-3-1. Precautions
4-4, MEMORY
4-4-1, Microprocessor memory back-up
4-4-2. Initial state and reset of
the microprocessor.
A. Initial state of the microprocessor
From the factory .....scecsseeseseereentneee 15
B. Microprocessor reset ..
4-4-3. Memory input......
4-4-4, Paired channels...
4-4-5, Priority channel select...
4-5. SCAN... cccccseteseseeneeneereee
4-5-1. Memory scan from the keyboard ..
4-5-2. Programmable band-scan from
the keyboard oo... es scccessseneesenetsesenertees
4-5-3. Scan direction.
4-5-4. Scan speed......
4-5-5. Scan lockout (Skip)
4-5-6. Scan release
4-5-7. Priority channel scan (Alert)
4-8. REPEATER.......ccsscceceeseees
4-6-1. Automatic repeater offset
4-6-2. Tone frequency
1. Setting...
2. Release...
4-7. AUTOMATIC TELEPHONE NUMBER
TRANSMISSION SYSTEM
4-7-1. Telephone number programming.
CONTENTS
eFRATURES
3.
03s2.,-2ccdscestedechssieitetsesrscnseesacss
aaieeaneeeery
4
4-7-2,
Storing
a
telephone
channel
in
NOPMaAl MEMOTY ......sesesesecersesseesesreeeseeene 22
.
SPECIFICATIONS
AND
ACCESSORIES..............
5
4-7-3.
Automatic
telephone
number
2-1. SPECIFICATIONS. 5 transmission. 2s
2-2,
ACCESSORIES
....
6
4-8.
DCL
(Digital
Channel
Link)
SYSTEM.
23
4-8-1. DCL system description 23
. INSTALLATION AND CONNECTION . 7 4-8-2. DCL system keyboard
3-1. INSTALLATION... 7 4-8-3. Digital code entry
3-1-1. Precautions . 7 4-8-4. Code squelch
3-1-2. Power supply. 7 4-8-5, Channel linkage
3-1-3. Mounting bracket.. 8 4-8-6. Recall.
3-2, CONNECTION...... 8 4-8-7. Reset and return.
3-2-1. Precautions . 8 4-8-8. Call sign entry. oar
3-2-2,
Fixed
station
9
4-8-9,
DCL
SyStem
NOteS
....scessesesceseesesrecnentens
32
3-2-3. Mobile ..... 9
A.
Battery
)
5.
MAINTENANCE
AND
ADJUSTMENT
B. Ignition noise 8 5-1. GENERAL INFORMATION
3-2-4. Antenna 3 5-2. SERVICE...
5-3. CLEANING.
. OPERATION... .10
5-4. MICROPROCESSOR BACK-UP LITHIUM
BATTERY REPLACEMENT ..
5-5, ORDERING SPARE PARTS..
5-6. ADJUSTMENTS........
5-6-1. Cover removal.
5-6-2. Low power output..
5-6-3. Microphone gain
5-6-4, DTMF level...
5-6-5. Sidetone and beeper level...
5-6-6. RF power meter..............
5-6-7. TO (Timer Operated) scan timer...
5-6-8. Open channel search step size
SELECTION. ....cceceestnereesensceeteessesseneeesensnee 35
5-6-9. Microphone UP/DWN step size and
scan step size selection
5-6-10. Microprocessor reset pins .
5-6-11. Call sign monitor test pins ....
6. BLOCK DIAGRAM 36
6-1. TM-3530A .
6-2. TM-2570A....
6-3. TM-2550A/2530A..
6-4. TM-2550E
7. OPTIONAL ACCESSORIES... 40
7-1. TU-7 TONE UNIT......
7-2, MU-1 MODEM UNIT ..
7-3, VS-1 VOICE SYNTHESIZER UNIT..
7-4. OTHER ACCESSORIES
8. REFERENCE
8-1. ANTENNA .
8-1-1. Fixed station
8-1-2. Mobile .........
8-2, MOBILE INSTALLATION...
8-2-1. Noise reduction
8-2-2, Battery capacity ...

1. FEATURES
@ Easy-to-operate panel layout using a large LCD
display
The large LCD display shows operational conditions
at a glance. The panel layout is ergonomically de-
signed for easy operation.
@ IHuminated keys for easier operation
Keyboard keys are back lit. Illumination is also provid-
ed for operational switches reducing mistakes in oper-
ation.
@ Dual microprocessor system
Two microprocessors provide a versatile range of
functions that has not been possible in the past.
@ High RF power output with excellent stability
A high stability, high power output is also assured thru
the use of a heat sink that incorporates improved ther-
mal design characteristics.
@ Microphone check function
This is useful for checking the microphone and modu-
lation circuits.
@ Automatic autopatch transmission
(TM-3530A/2570A/2550A/2530A only)
Autopatch operation has been simplified by incorpor-
ating the ability to store up to 15 telephone numbers
in memory and then allow automatic dialing on com-
mand.
@ DCL system (optional)
Using the latest in digital technology, this new com-
munication system for amateur radio communications
makes possible automatic open channe! search, auto-
matic station connection, code squelch (digital
squelch}, etc. (Fully compatible with KENWOOD’ cur-
rent DCS system.)
@ Voice synthesizer function
The selected frequency, digital code and ASCIl code
may be announced by synthesized human voice. (This
is provided by the optional VS-1 voice synthesizer.)
[Telephone number may also be announced.
{TM-3530A/2570A/2550A/2530A only)]
® improved tone function
{TM-3530A/2570A/2550A/2530A only}
38 subaudible tone frequencies can be selected and
stored in memory or from the keyboard. (This is pro-
vided by installation of the optional TU-7 tone unit.}
2.
SPECIFICATIONS
AND
ACCESSORIES
2-1.
SPECIFICATIONS
Phar
Mode!
TM-3530A
|
TM-2570A
|
TM-2550A
TM-2550E
TM-2530A
Specification
220 to 144 to 148 MHz 144 to 144 to
Frequency range
225 MHz 146 MHz 148 MHz
Mode
FM
F3
(F3E),
F2
(F2D)
(Control
signal
for
DCL
system)
Antenna
impedance
50
ohms.
Power
requirement
12
to
16
VDC
(13.8
VDC
reference)
Grounding
Negative
epee a with no 0.6A
Current drain
General
HI!
transmit
mode
Approx.
6.54
|
Approx.
164A
Approx.
9.54
Approx.
6.54
)
LOW
transmit
mode
Approx.
2.5A
|
Approx.
44
Approx,
3A
Approx.
2.54
Operating
temperature
-20°C
to
+50°C
(-4°F
to
+122°F}
Dimensions
Wide
1.80-mim
{Projection
not
High
60
mm
included)
Deep
195
mm
250
mm
215
mm
195
mm
:
1.8kg
2.35
kg
1.95
kg
1.8kg
Weight
{4
lbs)
(5.2
Ibs)
{4.3
Ibs)
25
W
min.
70
W
min,
45
W
min.
25
W
min.
5
W
approx.
Low
Adjustabl
Adjustable
u
Adjustabl
Output
power
jjustable
up
|
Adjustable
up
justable
up
{at
TeNDC.
to
out20
W
|
toout60W
Adjustable
up
to1out
40
W
to
out
20
W
ip
|:
oo
Obms
lead)
Pate
ical
1
minute
:
Transmission
z
ecommenced.
duty
3
minutes:
Reception
A
cycle
&
Modulation
Reactance
FE
Frequency
stability
Less
than
+15
PPM
Less than-60 dB
Maximum
frequency
deviation
+5
kHz
Audio
distortion
(at
60%
modulation}
Less
than
3%
(300
Hz
to
3000
Hz}
Spurious radiation
Circuitry
Double
conversion
superheterodyne
Intermediate
1st
20.935
MHz
10.695
MHz
frequency
2nd
455
kHz
f
12
dB
SINAD
Less
than
0.25
pV
Sensitivity
-
S+N/N
More
than
50
dB
at
1
mV
input
3
as
-6
dB
More
than
12
kHz
3
|
Selectivity
3
-60
dB
Less
than
24
kHz
i
Spurious
response
Beter
than
70
dB
(except
fd-IF/2)
Squelch
sensitivity
Less
than
0.125
iV
(threshold)
Scan
stop
level
Less
than
0.2
zV
(threshold)
Output
More
than
1.5
W
across
8
ohms
load
(5%
distortion}
External speaker impedance
Code
8 ohms
NRZ equal-length code
Modulation MSK modulation
Frequency deviation
+3.5 kHz reference
1200 Hz, +200 PPM
1800 Hz, +200 PPM
1200 bits/second, +200 PPM
Mark frequency and deviation
DCL control
Space frequency and deviation
Code transmission speed and deviation
Note: Circuit and ratings are subject to change without notice due to development in technology.

2-2. ACCESSORIES
Unpack your TM-8530A/2570A/2550A/2550E/2530A carefully and confirm that it
is supplied with the following accessories.
@ Dynamic microphone
Dynamic microphone (England only}.
@ Hook
@ Tapping screw .
(T91-0357-05) ..
(T91-0335-05) ..
ws (J19-1346-04) ..
.. {N87-4008-41) ..
1 pe.
1 pc.
a T po.
«2 pes.
@® Mobile mounting kit
a. Bracket (A13-0668-04) .. we T pe.
b. Bracket assy (Right) . (A13-0666-02) .. . Tpe.
c. Bracket assy (Left) (A13-0667-02) .. .1 pe.
d. Cushion we {G13-0823-04) . . 4 pes.
e. Allen bolt (Black) ... . (N99-0304-04) . . 4 pes.
f. Hex socket screw . . (NO9-0008-04) . . 4 pes.
g. Flange nut wo. (N14-05 10-04). . 4 pes.
h. Flat washer (Black) . (N15-1040-45) .
i, Flat washer .... . (N15-1060-46) .
j. Spring washer . (N16-0060-46) .
k. Tapping screw .. . {NO9-0632-05) ....
1. Hex wrench .......
@® DC power cable for TM-2570A
DC power cable for TM-3530A/2550A/
ZBBOE/2530A wise cecccscssstssseceseseneeneeessteneesnennens {E30-2022-15) ......ce 1 pe.
@® Spare fuse for TM-2570A (20A) .. (FO5-2034-05) .. 1 pe.
Spare fuse for TM-2550A/2550E (10A) .. (FO5-1031-05) 1 pe.
Spare fuse for TM-3530A/2530A (8A) (FO5-802 1-05) . 1 pe.
OO FOOt caine ew waandiakieed: (JO2-0439-05) .. 4 pes.
instruction manual (Excluded in England)... {B50-8039-20} 1 copy
Instruction manual (England only} (B50-8040-00) 1 copy
Warranty card (U.S.A. only) .. (B46-0410-00) ... . 1 copy
(W01-0401-05) ....
. (E30-2044-05) ....
Shipping container:
Save the boxes and packing in the event your unit needs to be transported for remote
operation, maintenance, or service.
3.
INSTALLATION
AND
CONNECTION
-1.
INSTALLATION
3-1-1. Precautions
1. Avoid direct sunlight, and select a dry, well ventilated
location.
2. Since the heat sink is on the rear panel, avoid placing
the equipment with the bottom and rear sides close to
a wall or desk.
3. When installing the equipment in an automobile, en-
sure adequate ventilation. Install the equipment in a
location where the rear does not make direct contact
with the seat, and is not directly exposed to vibration.
4, Avoid installing the equipment in front of the car
heater air outlet.
3-1-2. Power supply
The standard operating voltage of transceiver is 13.8 V.
Do not use a power supply (both fixed and mobile} that
provides over 16 V with the power switch of transceiver
turned off.
Operation under such a condition will void the warranty.
Also, do not use a power supply that does not supply at
least 12V in transmit or receive. Use of such a supply
“may cause the performance of the equipment to suffer.
3-1-3. Mounting bracket
Using the supplied mounting bracket, install the trans-
ceiver in any convenient location. (Fig. 3-1)
Caution:
Do not install the speaker directly on the transceiver, it
may cause howling. The heat sink provided at the rear of
the transceiver will get hot during long transmission. Do | Underside of
not install the radio in a position where the heat sink may dashboard
come in direct contact with the dashboard. Installation
near heater air outlets should also be avoided.
If your car is equipped with an electronic fuel injection
system, the transceiver should be mounted as far from
the control equipment as possible.
Side of console:
Install the bracket as shown in Fig. 3-2 and Fig. 3-3.
Note:
Do not install backwards.
Ae Body
Body
nf
lat
rae washer Fiat washer from your knees.
Mounting Spring
bracket Bolt washer
Tapping screw
The transceiver should be located
Underside of
dashboard
Drill holes in the bottorn of
dashboard. Secure the mounting
bracket with nuts and bolts.
Fig. 3-1
Mounting
bracket
Fig. 3-2

leo _—oil@
@ Lift the fever.
(a)
@ The angle of the bracket may
be adjusted to any of 5 possi-
ble viewing angles by loosen-
ing the 4 allen bolts at the
top of the bracket using the
hex wrench provided:
After the desired angle has
been selected tighten the 4
@ Press the lever down ta se-
cure the transceiver.
<_——_ © Carefully slide the transceiver
into the mounting bracket.
® By installing a Jock thru the
keyhole on the side of the
mounting bracket, the lever
can be locked and the trans-
ceiver secured.
Fig. 3-3
3-2. CONNECTION
3-2-1. Precautions
4.
When
connecting
or
disconnecting
the
power
cable
to
3
or from the power connector, be sure to turn off the
POWER
switches
of
the
transceiver
and
the
DC
power
4
supply.
2. Observe polarity of the cable. The transceiver oper-
ates on 13.8 VDC, negative ground. Battery polarity
must be correct. The power cable is color coded.:
Red and white : ® polarity (Positive)
Black and gray : © polarity (Negative)
. The standard operating voltage of the equipment is
13.8V. Do not operate below 12V or over 16V.
. When charging your vehicle battery, or when jump-
starting a dead battery, ALWAYS disconnect the
power cable from the back of the transceiver, or da-
mage may result to the transceiver.
3-2-2. Fixed station
A regulated DC power supply (13.8 VDC) is required. The
PS-430 is recommended for TM-3530A/2550A/2550E/
2530A. The PS-50 is recommended for the TM-2570A.
A. PS-50/430 connection
B. Connection of another DC source.
TM-3530A/
2570A/
2550A/
SP-430 2550E/
2530A
aii
Caution:
The PS-430 cannot be used with the
TM-2570A.
The KPS-7A can also be used with the
TM-3530A/2530A. (U.S.A. only)
TM-3530A/2570A/ Regulated DC
2B50A/2550E/ Power supply
2530A
Standard voltage: 13.8 VDC
Current capacity: TM-2570A:16 A
TM-2550A/2550E: 10 A
TM-3530A/2530A: 7 A
Note:
Preferably, the voltage should be adjusted to
13.8 VDC. The regulated supply should be
equipped with a built-in protection circuit for
both overcurrent and overvoltage.
Caution:
A battery charging power supply cannot be
used.
3-2-3. Mobile
A. Battery
Connect the power cable with fuse directly to the battery
terminals. Connecting to the cigarette lighter socket can
cause a poor connection, and excessive voltage drop.
Battery
TM-3530A/2570A/2550A/2550E/2530A
Rubber grommet
Feo battery
B. Ignition noise
This transceiver is designed to suppress ignition noise;
however, if excessive noise is present, it may be neces-
sary to use suppressor spark plugs (with resistors).
The PG-3A DC line noise filter is available as an optional
accessory for additional filtering, if required. (Except
TM-2570A}
3-2-4. Antenna
Note that the SWR of your antenna should be less than
1.5. A high SWR will cause the TM-3530A/2570A/
2550A/2550E/2530A protective circuit to operate, re-
ducing the transmit output power.

i
i
1
H
H
|
H
!
4. OPERATION
4-1. CONTROLS AND THEIR FUNCTIONS
4-1-1, Front panel
@ AL (Alert) switch
This switch is used to check the specified priority
channel. Depress the switch and the priority channel
will be checked at about 6 second intervals regardless
of the KEY/M.CH switch position. A “dual beep”
sounds when the priority channel is in use.
@ PRIO (Priority) switch
This switch is used to recall the priority channel. By
depressing the switch, the operating frequency is
switched to the priority channel, and the PRIO indica-
tor lights.
@ LCD Group
See page 12.
@ Keyboard
See page 13.
® F.LOCK (Frequency Lock) switch
Pressing this switch locks the selected frequency.
The LED indicator lights when this switch is ON, as a
visual reminder.
@® ON AIR indicator
This LED (Light Emitting Diode} will light during trans-
mission.
@ M.CH (Memory Channel) switch
This switch is used to select either key mode (key-
board operation) or memory mode {memory channel
operation). The MEMORY CHANNEL selector is illu-
minated in the memory made.
MEMORY CHANNEL and TONE FREQUENCY
selector
This switch is used to select the desired memory
10
@ ®
@® 9
Laut
pao
7
||
KENWOOD
TM-2550A
FLOCK
onan
MEH]
a)
|e
ion]
El
@
ca
a
coawn
me
root
Lt
z
aN
LOW]
S&RF
—
|
|
anim)
|
|S
Fo
pusnon||
|[
ctun
}
[rio
|[
rev
|[
cw
|
(a
144MHz
FM
TRANSCEIVER
Aa
4@CS
@CSQ
RESET
SCHL
mDCL
7)
vot
é
a
SQL.
ny
Q
.
<<
oO
Cj
oO
[POWER
|
I
®
channel. There are 23 memory channels. CH 1 to 19,
CH A (A), CH b (4), CH d (co!) and CH U (i). [This
control is also used to select one of the 38 tone fre-
quencies or one of the 75 telephone numbers.
({TM-3530A/2570A/2550A/2530A only)]
@® VOICE switch
Pressing the switch actuates the VS-1 voice synthe-
sizer unit.
TONE switch
(With the TM-3530A4/2570A4/2550A/2530A)
This switch is used to select the desired tone fre-
quency. Any one of which can be 38 different fre-
quencies between 67.0 Hz and 250.3 Hz are availa-
ble. See page 20 for additional information on this
switch. (Optional tone unit TU-7 required.)
{With the TM-2550E)
When this switch is pressed, the repeater control tone
signal (1750 Hz) circuit is activated and the unit is set
in the transmit mode.
@ (With the TM-35304/2570A/2550A/2530A)
PHONE switch
Press this switch to select the telephone address
number and program or recail the desired telephone
number.
See page 21 for further information on this function.
(With the TM-2550E)
P. MR (Paired memory channel direct recall)
switch
This switch is used for direct recall of paired memory
channels (16 CH).
— @ © @® ® ®
@® SQL (Squelch) control
To eliminate receiver noise during no-signal period,
! slowly adjust the SQL control clockwise until the
noise disappears and the C.TUN indicator goes off
H {threshold point).
When a signal is received, the squelch will open, the
i C.TUN indicator will light and the speaker will oper-
i ate. If the signal is. weak or fades during mobile opera-
| tion, readjust the squelch for constant reception. For
: scan operation, this control must be set to the thre-
i shold point.
@ POWER/VOL control
Power ON/OFF switch and volume control are com-
: bined. Turning the control fully counterclockwise will
i
turn the power OFF. Clockwise rotation will increases
the audio output.
'
DCL
system
keyboard
See
page
25.
® MIC connector (8-pin)
For connection of the supplied microphone {and or
¥ MC-48 autopatch microphone).
Earth (GND}
® Mic
7-@ STBY (PTT)
@® DOWN
@ uP
@ Earth (Mic)
® Nc
® ev
fl
1
Caution:
The radio may be damaged if an external source vol-
tage is applied to pins 2-5.
HIGH/LOW switch (1 HIGH = LOW)
HIGH setting: This setting allows the TM-2570A to
transmit up to 70 watts output, the TM-2550A/
2550E up to 45 watts output and the TM-3530A/
2530A up to 25 watts output.
LOW setting: This setting allows the TM-3530A/
2570A/2550A/ 2550E/2530A to transmit up to ap-
prox. 5 watts output.
@ SCAN switch (11 TO .= CO)
When TO (Time Operated) scan has been selected the
scan will stop on an occupied channel for a specific
time frame {internally adjustable between O and 5 se-
conds). When CO (Carrier Operated) scan is selected
the radio will remain on a station until the carrier
drops out.
LAMP switch (=. ON)
This switch is used to illuminate the keys and
switches.
REV switch
This switch is used to reverse the repeater shift
(+600 kHz for the 144 MHz band, + 1.6 MHz for the
220 MHz band) and other transmit/receive frequen-
cies (CH 16 -CH 17, CH 18-CH 19).
44

1. LCD group
{== 3-5 —7T—9-— — LL
[_¢-tun [prio | REV
@® TX offset indicators
[-| By pressing the key on the keyboard, the [-
indicator will light in sequence to show the trans-
mit frequency is switched down 600 kHz (1.6
MHz with the TM-3530A) from the receive fre-
quency.
[S| By pressing the [OS] key on the keyboard, the [S
indicator will light in sequence to show the trans-
ceiver is operating in the simplex mode.
+] By pressing the [OS] key on the keyboard, the [+
indicator will light in sequence to show the trans-
with the TM-3530A) from the receive frequency.
@[T]indicator
This lights when the tone function has been selected.
@ SCAN indicator
This indicator lights when scan operation is in pro-
gress.
@ TELEPHONE indicator
This indicator lights when the automatic telephone
number transmission function has been selected. See
page 21. (With TM-3530A/2570A/2550A/2530A
only)
© Hz indicator
“MHz” lights in the frequency display mode.
[The display changes to “Hz” in the tone frequency
display mode. (TM-3530A/2570A/2550A/2530A
only)
12
mit frequency is switched up 600 kHz (1.6 MHz
@® CHL (Channel Link) indicator
This indicator lights when the DCL (Digital Channel!
Link) has been completed.
@ Memory channel display indicator
These indicators display memory channels 1 to 19, A
(Abb) d(d )orU (iF).
* mark
Memory channel scan lock-out designator.
If you desire to skip a busy memory channel during
memory scan, press the [LO] key. The star designates
the channel will be skipped during scan.
©® REV (Reverse) indicator
This indicator lights when the REV switch is ON.
PRIO (Priority) indicator
This indicator lights when the PRIO switch is ON.
@ C.TUN (Center Tuning) indicator
This indicator lights when the receiver has tuned in to
another station. :
@ S/RF level meter
This LED level meter indicates the relative receive in-
put signal strength or transmit RF output.
The level meter also indicates the microphone input
level during low-power transmission so that micro-
phone checking is possible.
@® Frequency, digita! code, and call sign (ASCII code) in-
formation are displayed.
[The tone frequency, telephone channel number and
telephone number are also displayed. (With
TM-3530A/2570A/2550A/2530A only)]
2. Keyboard
@® Numeric keypad [7]~-[0]
Depress the [6], [9/, [4] and [0] keys respectively. The
frequency display will indicate “6.940" (146.940
MHz). .
{The number keys function also serve as autopatch
keys during transmit mode. (TM-3530A/2570A/
2550A/2530A only)]
0) (Offset Select) key
Depress this key to select a frequency shift other than
the one recommended by the ARRL Band Plan (Sim-
plex, +, or -, 600 kHz for the 144 MHz band and 1.6
MHz for the 220 MHz band) and the ITU Region 1
Band Plan (Simplex, -600 kHz for the 144 MHz
band). (The standard ARRL and Region 1 Band Plan
have been pre-programmed.)
@ [PS] (Priority Select) key
This key is used to designate the priority channel.
First, select the desired channel, then depress the
PRIO switch and finally press the [PS] key.
The microprocessor is reset by turning the POWER
switch ON while depressing this key.
@ [LO] {Lock-Out) key (Skip)
This key is used to designate the memory channel(s)
to be skipped during memory scan. Select the chan-
nel to be skipped when the select switch is set to
M.CH and then press this key. A star * appears on the
LCD to show the channel has been locked-out.
© [SC](Scan) key
This key is used for scan operation. Press the key
when the squelch is ON. Band-scan operation is exe-
cuted while in the key mode and memory-scan opera-
tion is performed in the memory mode.
®([C] (Clear) key
Use this key if you have made an error during pro-
gramming. By pressing this key, the frequency set by
the numeric keypad is cleared. When cleared, the fre-
quency display will indicate the frequency that was
displayed before the last entry was cleared. This key
is also used to release scan operations.
@[M] (Memory) key
This key is used to store frequency and offset.
[This key is also used to store tone frequencies and
telephone numbers in memory. (TM-3530A/3530A/
2570A/2550A/2530A only)]

t
‘
i
i
4-1-2, Rear panel
@ EXT SP (External Speaker) terminal
Connect a 4 ~ 16 ohm speaker using the supplied
plug.
@ ANT terminal
Connect a 50-ohm antenna to this terminal.
4-1-3. Microphone
@ Fuse holder
@ DC power input terminal
Connect the supplied power cable. Input voltage is
13.8 VDC. Do not reverse the polarity!
@ UP/DWN switches
These switches are used to step the operating fre-
quency up or down during both keyboard and memory
channel operation.
@ PTT (Press-To-Talk) switch
PTT switch used for transmission. This will also re-
lease scan operation.
4-2. RECEPTION
After power and antenna connections have been com-
pleted, set the controls and switches as follows:
@ Turn the POWER/VOL control, clockwise, to turn on
power. The indicators on the display will light to
show the transceiver is operating.
The indicators normally work about 0.5 seconds after
the power switch is turned on. [When the power
switch is initially turned on, 4.000 (0.000 with the
TM-3530A) will be displayed.]
@ As the POWER/VOL control is turned clockwise,
either background noise or a QSO will be heard.
@® To eliminate the no-signal noise, use the SQL control.
For SOL control operation, refer to the following ex-
planation.
@ Enter the desired frequency using the numeric keypad.
4-3. TRANSMISSION
4-3-1. Precautions:
@ The TM-3530A/2570A/2550A/2550E/2530A an-
tenna impedance is 50 ohms. Be sure to use only an
antenna of 50 ohms impedance.
@ Check the intended transmit frequency before operat-
ing to prevent interference with other stations.
@ Pressing the PTT switch places the transceiver in
transmit mode; the ON AIR indicator will light and the
LED bar meter will show the relative transmitter
power. Recommended talk distance to the micro-
phone is approximately 5 cm.
To transmit, first select the desired frequency and see
whether it is busy or not. If it is not busy, simply depress
the PTT switch and speak into the microphone. The ON
AIR indicator will light.
HI/LOW switch
Local OSO’s can be enjoyed with less interference to
others, and with less power consumption, by reducing
the RF output power.
The relationship between the HI/LOW switch positions
and the actual output power is as follows.
TM-2570A Hl : 7OW/approx. 16 A
LOW: Approx. 5W/approx. 3A
TM-2550A/2550E HI : 45 W/approx. 9.5 A
LOW: Approx. 5 W/approx. 3 A
TM-3530A/2530A HI : 25 W/approx. 6.5 A
LOW_ : Approx. 5 W/approx. 2.5 A
At LOW power, the power indication will drop to approxi-
mately “4 — 6” on the meter, and the microphone modu-
lation check function operates.
4-4. MEMORY
4-4-1. Microprocessor memory back-up
A lithium battery is contained in the transceiver to retain
memory. Turning off the POWER switch, disconnecting
the power cable, or a power failure will not erase the
memory. The battery should last for approximately five
years. When the battery discharges, an erroneous dis-
play
may
appear
in
the
display.
(For
the
lithium
battery
replacement, refer to section 5-4 on page 33.)
Notes:
1.
When
the
lithium
battery
is
replaced,
the
micropro-
cessor
must
be
reset,
using
the
procedure
in
section
4-4-2.
2. When the lithium battery fails, the radio’s microcoded
functions are NOT affected. Only information stored
in memory will be cleared.
4-4-2. Initial state and reset of the micropro-
cessor
A. Initia! state of the microprocessor from the
factory
Default setting after reset
Display |
Frequency: 4,000 (144.000 MHz}
[0.000 (220.000 MHz} with the
TM-3530A)
Offset: (Simplex)
Memory channel: CH 1
KENWOOD TM-2550A,
ure
ae ees
SARE 7
L
‘144M FM TRANSCEIVER:
[acs e050 RESET SCHL mDCL
Hoooo
Display after reset
B. Microprocessor reset
When the microprocessor has functioned erroneously or
when setting the transceiver in the initial state, switch on
the power with the PS key pressed.
Note:
The microprocessor can be easily reset. However, only
perform this operation when necessary since the con-
tents of memory are cleared by resetting.
KENWOOD
a
boc
ra
aah PH TRANECEER,
OboOO
Turn POWER switch ON while
depressing the [PS] key.

@ ® D Set to key
mode
7 = 3 fos}a {FLOCK on ain MICH]
4s) 6) | Lesie
7 is jie ic c
* Mev Fa
WJ) |(od| fe) (ele G
— CH17
— CH19
TX
— CHi6
— CH18
4-4-3. Memory input
(The same procedure is used with the TM-3530A.}
Example: Storing 144.650 MHz with +600 kHz offset in
memory CH 5.
@ Set the M.CH switch to key mode. (The MEMORY
CHANNEL selector will not be illuminated.)
® Press the [4], (6], [5]and [0] keys in order.
(“O” will be automatically selected as the last digit
when you enter O ~ 4, as the last digit. “5” will be se-
lected when you enter 5 ~ 9 as the last digit.)
@ Press the [OS] key to select an offset other than the
standard offset for that frequency. You can scroll thru
the different possibility by repeatedly pressing the
key. lf you want the standard offset skip this step.
@ Rotate the MEMORY CHANNEL selector until memory
CHS appears in the memory channel indicator.
@ Press the [M| key to enter the information into
memory.
To confirm memory channel entry press the M.CH key.
Tne MEMORY CHANNEL selector will be illuminated.
The LCD should show the frequency and offset that you
just entered, 4.650 “+”. If the display does not show the
correct data, simply repeat steps 1 thru 5.
If you wish to store new data into a memory channel
simply repeat steps 1 thru 5 for the desired memory
channel. Old data will be lost when you press the [M]key.
‘4-4-4, Paired channels
Two paired channels allow for “odd split" frequency
shifts. Use this option when the desired frequency shift
is other than the standard 600 kHz (1.6 MHz with the
TM-3530A) shift. Any split within the full operating
range of the radio is possible.
Channel pairs are: CH’s 16-17 and CH’s 18-19
Example: A 1 MHz split stores 144.600 MHz in CH 16
and 145,600 MHz in CH 17.
@ Follow the “MEMORY INPUT” procedure on page 17
to store these frequencies in channels 16 and 17.
Either frequency (receive or transmit) may be stored! in
either channel of the pair.
@ To operate this channel pair, set the M.CH switch to
memory mode and select either CH 16 or CH 17 with
the MEMORY CHANNEL selector.
@® Transmit, and the displayed frequency changes to the
transmit frequency stored in the alternate channel of
the pair.
@ Release the PTT switch, and the original receive fre-
quency stored in CH 16 or CH 17 will display.
The other channel pair, CH 18 - 19, operates in the same
way. When channel pairs are used, the 600 kHz (1.6
MHz with the TM-3530A) shift and mode indicators, |+
=]and [S| do not function.
de gees ote Se
Set the AL
switch to ON.
@ Press to designate the
priority channel.
Ta mae || KENWOOD.
TM=2550A
@Select
the
desired
channel.
4-5. SCAN
Select to TO ar CO prior to ini-
tiating scan.
-=CO.MTO PUSH ON
Lights during scan operation. @ Set to memory mode.
LZ
5]
PHONE TONE VOICE.
Oooo
@ Press to start
scanning
@ Press to release scanning.
{Scanning may also be re-
leased by pressing the PTT
switch.)
4-4-5. Priority channel select
Any
one
of
the
23
memory
channels
can
be
selected
as
the priority channel.
@ Depress the AL switch.
@
Select
the
memory
channel
to
be
the
priority
channel
using
the
MEMORY
CHANNEL
selector.
@ Press the [PS] key to enter the selection.
SCAN
operations
are
divided
into
keyboard
scan,
memory
scan
and
priority
channel
scan.
For
SCAN
oper-
ation,
the
squelch
control
should
be
advanced
to
the
threshold
point.
(See
page
11
for
squelch
control)
First,
select
either
TO
(Time
Operated)
hold
or
CO
(Carrier
Operated)
hold
with
the
SCAN
switch.
The
TO
scan
duration
may
be
set
thru
the
use
of
an
inter-
nal
potentiometer.
For details, see page 34.
4-5-1, Memory scan from the keyboard
@
Press
the
M.CH
switch
to
select
memory
mode.
(The
MEMORY
CHANNEL
selector
will
light.)
@ Press the [SC] key to initiate scanning.
Scan
will
begin
from
the
current
displayed
channel
ad-
vancing, toward the higher numbered channels.

|
Lights during scan operation @ Select key mode.
FLOCK oNAR MICH
PHONE TONE VOICE
OOo
@ Press to release scanning. @ Press to start
{Scanning can also be re- scanning.
leased using the PTT
switch.)
@ Select the channel ta @ Set to memory
Lock outindicator be locked out. mode.
(cock “onan
Na OE
| By
PHONE TONE VC
OOC
@ A star * will appear on the @When the Lo] key is pressed
display when this key is again, the star * will disap-
pressed, indicating that pear and lockout will be re-
Jockout has been complet- _ leased.
ed.
18
4-5-2. Programmable band-scan from
the keyboard
The
lower
limit
may
be
programmed
into
memory
“d”
and
the
upper
limit
into
memory
“U”.
@ Press the M.CH switch to select key mode. The
MEMORY CHANNEL selector lamp will go OFF.
@ Press the [SC] key to initiate scan operation. If scan is
initiated within the limits set in channel“ d“ and” U",
scan will proceed from the currently displayed fre-
quency (within the programmed limits}, in 5 kHz
steps. If you initiate scan outside the programmed
limits, scan will proceed outside the programmed
limits, in 5 kHz steps.
@ When the same frequency has been stored in both
memory “d“ and memory “ U". The radio will scan
the entire frequency range of the radio.
4-5-3. Scan direction
During scan operations you can reverse the direction of
scan with the UP and DWN pushbuttons on the micro-
phone. Pressing the DWN key causes scan to proceed
down in frequency. Pressing the UP key causes scan to
increase in frequency.
4-5-4. Scan speed
Scan speed can be increased by holding either the UP or
the DWN key depressed, depending upon the desired di-
rection of scan.
4-5-5. Scan lockout (Skip)
This transceiver has a scan lockout function which al-
lows you to temporarily skip unwanted memory channels
during memory scan.
@ Press the M.CH switch to select the memory mode.
(The MEMORY CHANNEL selector will light.)
@ Select the memory channel to be skipped by using the
MEMORY CHANNEL selector.
@ Press the key and a star * appears to the left of
the memory channe! number.
@ Repeat steps @ and @ to lockout any unwanted
memory channels.
To cancel channel lockout, select the memory channel
to be restored, and press the [LO| key. The star will
disappear.
4-5-6. Scan release
Scanning can be released by any one of the following
operations: Select the most convenient.
@ Press the [C| key.
@ Press the PTT switch once.
@® Turn power OFF.
@ Set the PRIO switch to ON.
® Set the F.LOCK switch to ON.
Al PRO)
4-6. REPEATER
4-6-1. Automatic repeater offset
The standard ARRL and ITU Region 1 Band Plan, as far as
TX offsets is concerned, has been pre-programmed into
the TM-3530A/2570A/2550A/2550E/2530A. This
4-5-7. Priority channel scan (Alert)
To
monitor
the
priority
channel,
press
the
AL
switch
in.
When
there
is
activity
on
the
band
you
will
hear
two
beeps
at
about
six-second
intervals.
The
REV
switch
deactivates
this
priority
alert.
may
be
easily
overridden
by
using
the
[OS]
key.
The
chart
below
graphically
displays
the
programmed
off-
sets,
(With the TM-3530A}
a Se
{With the TM-2570A/2550A/2530A)
144.00
145.10
145.50
(With the TM-2550E)
220,000 223940 224995
446.00
146.40
146.60
147.00 147.40
14760
148.00
144.00 : 146.00

® [indicator tights.
1) © Select the tone
frequency.
KENWOOD.
[TM-2550A
hi
aor
=
Tie)
cs
oe
|||]
®
ee
te
:
TT
healealcalen|
7
\
i
y
a
4
seceteraniver
||
OI
LeU
Fed
Be
[ars _ecco Absey scm
Ito Oo
SOE | voll ee SOL pare
a0; ©: ji
% ® TONE switch ON.
@ Store in memory.
® [FT indicator will go OFF.
MEMORY CHANNEL selector
“Te wwe rm tamnscewer
wes seee— Weer
ce WEL
oO
@®Q Release.
4-6-2. Tone frequency
(TM-3530A/2570A4/2550A/2530A only)
(The tone unit TU-7 option is required for this function.)
1. Setting
@ Turn the MEMORY CHANNEL selector to select the
desired memory channel.
(When in the key mode you may ignore this step.)
@ Press the TONE switch. The display will indicate the
CTCSS tone frequency, or” = ———".
@ Tum the MEMORY CHANNEL selector to select a tone
frequency from the 38 possible frequencies. The |T
indicator will light.
@To store the tone frequency into a memory channel,
press the |M|key.
{This step may be ignored when in the key mode.)
@® Press the TONE switch to return to the frequency dis-
play mode. When transmission is begun in this mode,
the tone frequency currently selected will be transmit-
ted.
Example: To store tone frequency 88.5 Hz in memory
CHS
@ Set the M.CH switch to memory mode (so that the
MEMORY CHANNEL selector is illuminated} and turn
the MEMORY CHANNEL selector to display “5S” in the
memory channel display indicator.
@ Press the TONE switch.
@ Turn the MEMORY CHANNEL selector to display
“88,5 Hz” in the tone frequency display. The [T]indi-
cator will light.
@ Press the [M] key, to complete the storage of the tone
frequency.
@ Press the TONE switch to return to normal frequency
display mode.
2. Release
® Instead of step @ above, press the [C] key or rotate
the MEMORY CHANNEL selector to display“ —--—".
The [T]indicator will go OFF.
@ To release the tone frequency stored in memory,
press the [C] key.
Available CTCSS tone frequencies
4-7. AUTOMATIC TELEPHONE NUM-
BER TRANSMISSION SYSTEM
(TM-3530A/2570A/2550A/2530A
only}
®
—= KENWOOD. TH-2550A fea Pee oe EP =a
o -3 Olapoe|PAse
————, — 3))| (Cs) feade|
hero coef LL | 15 Ear
. _ Le FoaumeParenigeeven | || CO 7
f See etsy AEE ECE Ao) | vO ory SOL =
Oo wy OOo
Telephone number channe! ao
Memory channel
Telephone number channel display (Fig. 1}
KENWOOD. TM-25508,
Peele
Generel CL
[=
Testa Fu TARPSCEIVER
face _ectt_AcseT sen { wort]
Oooo
Telephone number channel
First three digits entry (Fig. 2)
Tata || KENWOOD “TM-2550A,
==) [xm] [=n
Come)
7
coro|| 4557 Ba
ae
[a]
“Goo
ao J Z
=e |e
(evi)
Teeth Fi TRANSCENER,
Final four digits entry (Fig. 3)
This
function
simplifies
conventional
16-key
autopatch
operation
by
utilizing
a
one-touch
automatic
dialing
sys-
tem.
Up
to
15
different
7-digit
telephone
numbers
may
be
stored
in
memory.
A
separate
channel
is
assigned
to
each
telephone
number,
and
all
telephone
number
pro-
gramming
is performed
in
reference
to
this
channel.
Example:
Storing
the
telephone
number
(123-4567)
in
the
telephone
number
CH
3.
4-7-1. Telephone number programming
@ Press the PHONE switch
The
display
will
show
“fi--"
if
no
telephone
data
has
been
programmed,
or
the
reset
button
has
been
installed.
If
data
has
been
programmed
the
display
will show the current telephone channel number.
@
Rotate
the
MEMORY
CHANNEL
selector
to
select
the
desired
telephone
number
channel.
The
telephone
in-
dicator
14)
will
light
and
the
display
will
show
“FD
1
(thru
Ff
15)".
@ Press the [PS] key.
The
display
will
show
the
first
three
digits
and
a
hyp-
hen,
or
three
blanks
and
a
hyphen
if
no
data
has
been
entered.
The
memory
channel
display
will
now
indi-
cate
the
selected
telephone
number
channel
(1
—
15),
rather
than
the
normal
memory
channel
numbers
(1
—
19,
8,
6,
J,
Lf).
A
beep
will
sound
each
time
you
pass
channel
1
as
a
quick
audio
check
of
your
relative
position.
As
you
rotate
the
MEMORY
CHANNEL
se-
lector
the
telephone
channel
number
will
change
and
the
first
three
digits
of
the
telephone
numbers
con-
tained
in
the
various
channels
will
be
displayed.
If
no
data
is
entered
the
display
will
only
show
the
hyphen.
@
Enter
the
first
three
digits
of
the
telephone
number
us-
ing
the
numeric
keypad.
Input
errors
may
be
cleared
by
pressing
the
[C]
key.
After
the
third
digit
has
been
entered
a-beep
will
sound
and
the
display
will
show
4
blanks,
indicating
the
radio
is
waiting
for
you
to
enter
the
final
four
digits.
@
Use
the
numeric
keypad
to
enter
the
final
four
digits.
After
the
final
digit
has
been
entered
a
beep
will
sound,
and
the
display
will
return
to
show
the
first
three
digits
of
the
telephone
number.
You
can
review
the
contents
of
the
entire
telephone
channel
by
repea-
tedly
pressing
the
[PS]
key.
(To
enter
a
pause,
or
blank
press
the
|SC]
key.)
Entry
of
the
remaining
telephone
channels
is
performed
as
in
steps
4
and
5
above.

¥:
';
PHONE TONE VOICE
O®
(FLOCK [ox an CH
i
4-7-2, Storing a telephone channel in normal
memory
@ Select the desired memory channel with the MEM-
ORY CHANNEL selector.
@® Press the PHONE switch.
@ Select the desired telephone channel number with the
MEMORY CHANNEL selector.
(When the [C] key is pressed, “Fi—-" will be dis-
played,
erasing
any
previously
stored
telephone
chan-
nel number, and turning off the telephone indicator
pi. !f you wish to review the contents of the tele-
phone
channel
press
the
[PS]
key
as
previously
de-
scribed.}
@® Press the [M] key.
(Pressing the fu] key stores the telephone channel in-
formation in the selected memory channel. Either the
key mode or the memory mode may be used for this
operation.)
@® Press the PHONE switch to return to the normal fre-
quency display.
Any
telephone
number
channel
may
be
entered
into
any
memory
channel
location
using
the
above
procedures.
4-7-3.
Automatic
telephone
number
transmis-
sion
@ Select the desired telephone number channel using
the MEMORY CHANNEL selector.
@ Press the PTT switch.
@ Press the PHONE switch to initiate transmission of
the telephone number.
(Pressing the PHONE switch with the telephone indi-
cator off will cause an alarm to sound, signifying an
error in operation.
* Conventional 16-key autopatch operation is also possi-
ble, as is a combination of automatic dialing and con-
ventional dialing. Simply press and hold the PTT bar
when conventional! operation is desired.
4-8.
DCL
(Digital
Channel!
Link)
SYSTEM
(The
optional
modem
unit
MU-1
is
required
for
DCL
sys-
tem
operation.}
*Packed
with
a
variety
of
new
ideas,
the
DCL
system
makes
possible
multiple
functions
with
simple
opera-
tion.
*The
DCL
system
incorporates
additional
features
but
is
compatible
with
the
current
DCS
system.
4-8-1. DCL system description
A,
Aiitomatic
QSY
from
any
frequency
to
an
open
channel
The
DCL
system
searches,
on
command,
for
an
open
channel,
remembers
it,
returns
to
the
original
frequency
and
transmits
control
information
to
the
receiving
station
that
switches
both
radios
to
the
open
channel.
Micro-
processor
control
assures
fast
and
reliable
operation
of
the
DCL
system.
B. Operating principle of DCL system
The
circuit
concept
of
the
DCL
system
is
shown
in
the
diagram,
IC2
is
the
main
processor
which
controls
the
DCL
system’s
input/output
processing
and
other
general
functions.
1C3
is
a
processor
concerned
primarily
with
data
processing,
and
Modem
(modulator/demodulator)
is
the
data
transmission
LSI
using
MSK
(Minimum
Shift
Keying).
As
the
digital
data
interface,
the
modulator
sec-
tion
sends
data
required
for
transmission
as
a
MSK
sig-
nal
synchronized
with
the
clock.
The
demodulator
sec-
tion
decodes
the
incomming
MSK
signal!
to
obtain
the
data
signal,
and
also
reproduces
the
clock
signal
at
the
same
time.
Required
data
is
exchanged
between
these
iCs
as
is
the
clock
data,
so
as
to
process
various
func-
tions.
Conventional method [manual} DCL system
Find an open channel from the
operating fraqueney (channel). ]
Send the open freq
uency information
to the receiving station. |
Both stations move to
the open channel.
Allaperations
are automatic with
the DCL system.
Main
Ic2
Sub
processor
1c
‘To TX modulator
Control signal {(MSK)
Keyboard
‘Transmission/
eption
judgemant,
Busy judgement
From BX detector
Concept of DCL system
1 Mark Space
1 4200H2 1 1800 Hz
i
a
ag
ne nt
tt
H
a
t
1
1 ’ '
MSK
signal
x
1
h
1 1
t
H
L :
Data
Relationship
between
MSK
signal
and
data
C.
Digital
code
memory
function
for
handling
multiple
stations,
plus
standby
functions:
There
are
100,000
5-digit
code
groups
possible.
Several
different
codes
can
be
stored
in
memory.
D.
Recall
and
reverse
functions
for
preventing
received
station
being
lost:
When
the
DCL
system
of
the
station
which
has
received
digital
signa!
is
not
ON,
or
when
skipping
to
an
open
channel
is
not
possible,
due
to
interference
or
distur-
bance,
instructions
to
the
called
station
can
be
easily
retransmitted.
E.
Automatic
transmission
and
display
of
cali
sign
Up
to
6
characters
can
be
input
as
the
cal!
sign.
Alth-
ough
the
input
uses
ASCII
codes,
2-digit
hexadecimal
numbers
are
actually
utilized
for
call
sign
entry.
Each
code
is
converted
into
an
ASCII
code
inside
the
radio.
Call
sign
data
is
transmitted
as
long
as
the
DCL
switch
is
ON.
An
unique
feature
of
this
system
is
that
by
combin-
ing
it
with
the
optional
CD-10
call
sign
display,
it
can
de-
code
the
signal
from
a
station
which
uses
the
DCL
sys-
tem
and
display
that
call
sign
alphanumerically.
F.
New
code
squelch
function
with
repeater
operation
Code
squelch
is
a
selective
squelch
system
operated
thru
the
use
of
digital
codes.
It
allows
you
to
listen
only
for
those
stations
that
transmit
the
proper
digital
code.
It
is
especially
powerful
when
more
than
one
station
is
on
the
frequency,
like
when
using
repeaters.
Its
advantages
are;
1)
Very
few
operation
errors
thanks
to
digital
control;
2)
Multiple
access
code
monitoring;
3)
Possibility
of
linkage
to
an
open
channel
even
during
long
periods
of
inactiv-
ity.
When
operating
on
a
repeater,
the
control
signal
(as
shown
in
the
diagram)
is
transmitted
to
assure
proper
code
squelch
operation.
23

Control
signals
for
CHL
operation
Control
signal
:
&
:
The
contro!
signal
with
channel
data
G
:
The
control
signa!
with
no
channe!
data
Flashing CHL indicator
Beep: Beep 1
DCL system indicator ON
CHLindicator
ON
S1Beep 2
-
1
Time
>
1
DCLSwW
CHLSW
!
ON ON
Time
—
Original
RX
freq.
af
Open
channe!
RX
asy
Fig. a. Simplex mode
DCL
system
indicator
ON
©
|©§
———__-—_____->
Flashing
CHL
indicator
ee
indicator
ON
—+
—K
=|
Beep
2
Time
—>
4
“Beep
1
pcLsw CHLSW
t
1
1
!
i
ON oh | Sub tone Y
Sub tone
Time
—
rey
eRe
PTT
SW
Original RX freq.
ON Approx. 1 sec.
7 Open channel receive
PTTSW
OFF
Fig.
b.
Offset
mode
(TM-3530A/2570A/2550A/2530A)
Flashing CHL indicator
Beep I-3—+ St
DCL system indicator ON
CHL indicator ON-
ter Beep 2
Time
—
at
i
|
“Beep
1
|
persw
CuLSW
;
ON
1750
He]
G
el
tone
Time
—>
t
TONE SW TONE SW PTT SW
ON OFF
Approx. 1 sec.
Original
RX
freq-
Open
channel
RX
asy
PTT SW
OFF
Fig. c. Offset mode (TM-2550E)
G.
Control
signal
of
DCL
system
The
DCL
control
signal
consists
of:
1)
Bit/frame
sync
signal
for
distinction
of
the
DCL
signal
from
noise
or
other
data
communication
signals;
2}
5-digit
digital
code
data
for
station
recognition;
3)
Open
channel
data;
and
4)
Call
sign
data
which
is
a
combination
of
alphanumeric
data.
Auxiliary
data
is
also
provided
for
future
system
ex-
Time
+
pansion.
This
control
signal
is
transmitted
at
a
speed
of
1200
baud,
requiring
approx.
0.2
seconds,
which
has
al-
most
no
effect
on
normal
communication.
A
beep
sound,
peculiar
to
DCL,
(similar
to
the
sound
of
“packet
radio")
is
heard
when
this
signal
is
received.
DCL operation control signal
BZ
The
control
signal
with
no
channel
data
| _= system indicator lighting
i i
i
DcLSW
PTTSW
prisw
ON
ON
OFF
Fig. a. Simplex mode
DCL system indicator ON-——_____
‘Sub tone ‘Sub tone
‘Synchronizing signa!
‘Auxitiary
Composition
of
control
signal
Call sign
data
nA
Time = sel sas Rian Ts pITsw
oN at sw 8 ‘OFF
Fig. b. Offset mode
{TM-3530A/2570A/2550A4/2530A)
DCL system indicator ON
—,
Time + ‘Approx. 1 sec.
oo
pirsw
re
Fig. c. Offset mode (TM-2550E)
4-8-2. DCL system keyboard
acs
|
®
@
CS
(Code
Set)
key
Use
this
key
when
programming
the
digital
code
and
call sign.
@ C.SOQ indicator
This lights when the C.SQ function is ON.
® C.SQ (Code Squelch) key
Use
this
key
to
turn
the
code
squelch
function
ON
or
OFF.
The
C.SQ
indicator
lights
when
this
function
is
activ-
ated.
4-8-3. Digital code entry
Operating procedure
@ RESET key
Use
this
key
to
reset
channel
linkage
operation.
©® CHL (Channel Link) key
Use this key for channel linkage.
@® DCL system indicator
This lights when DCL is ON.
@
DCL
(Digital
Channel
Link)
key
Use
this
key
to
turn
the
DCL
system
ON
or
OFF.
The
tive.
Operation
DCL
system
indicator
lights
when
this
function
is
ac-
Remarks
1. Press the CS key to cause the digital
access code to be displayed.
("00000" is displayed initially.)
KENWOOD. Te 2550A
2 Ee
miner
eps Lt Lt sae
{ea ‘petra ra REET
|
Rome!
Pressing
the
key
once
causes
the
digital
access
code
to
be
displayed.
(Pressing
the
key
again
will
return
you
to
the
normal
frequency
display.)
The digital code cannot be
programmed with the
F.LOCK on.
This function is independent
of the DCL key setting.
2. Enter the digital code using the nu-
meric keypad.
KENWOOD: “TM-2560A
fesiiealioay
ae
fer iean
VoL, ‘504, ro!
few)
ey
The
code
is
stored
in
memory
automati-
cally,
when
the
final
digit
is
entered,
and
is
confirmed
by
long
beep.
Itis possible to receive while
setting the codes but not to
transmit.
3. Rotate the MEMORY CHANNEL se-
lector to select the desired code posi-
tion for data entry, or to review the
contents of the other 9 code memor-
[wal
[ex]
Oi O OW |.
Each
time
the
MEMORY
CHANNEL
se-
lector
is
rotated
one
detent
position
the
code
memory
will
increment/decrement
one
position.
Continued
rotation
will
al-
low
continious
tuning
of
the
code
posi-
tions.
An audible beep is emitted
from the radio each time the
dial is rotated to code me-
mory position one.
4.
Press
the
C.SQ
key
to
activate
the
C.SQ
indicator.
OSes
oo
Pressing
this
key
once
lights
the
standby
indicator.
Pressing
the
key
again
will
turn
the
indicator
OFF.
This operation is valid only
while the digital code is be-
ing displayed.

Operating procedure
Operation
Remarks
5. Press the CS key to return to the nor-
mal frequency display.
KENWOOD "Ti 2E608
[eset »
oe
aie SV IMNEEN ER
BoOooL
Notes:
After all inputs have been completed,
press the CS key to return to the normal
frequency display.
As long as you are displaying
the digital codes you will not
be able to transmit.
Attempting to transmit will
cause an error alarm of three
beeps to sound.
@
To
manually
release
the
code
squelch,
press
the
C.SQ.
key
again
or
press
the
PTT
switch.
(This
does
not
start
transmission.)
@ Channe! linkage using the DCL system is effective
even in code squelch mode.
4-8-5. Channel linkage
Channel linkage operations cannot be performed until
you have completed entering at least one digital access
code. This information is required for proper system
operation. You do not need to use the code but ft must
With
the
DCL
system
ON
(DCL
key
ON)
in
the
code
squelch
condition
(C.SQ
key
ON),
turning
the
DCL
key
OFF
will
also
release
the
code
squelch
function.
@
The
alert
function
has
priority
over
code
squelch
oper-
ation.
be
present.
The
DCL
function
allow
easy
one
touch
QSY
to
the
first
available
open
channel,
of
not
only
your
radio,
but
the
receiving
radio
as
well.
1. The digital code that appears when the CS key is
pressed is the code that will be transmitted, regard-
less of the standby status.
2. The digital code that appears when the CS key is
4-8-4. Code squelch
This function gives the operator the ability to select
which stations he/she wants to listen to. Only those sta-
tions that transmit the proper access code will be able to
“OPEN” squelch.
For example: when station A wishes to talk with station
pressed will also be one of the “Active” codes in re-
ceive, along with any other codes that have the
standby indicator “ON”.
B only, both stations should prearrange to be on the
same frequency, with the same access code.
Example: Frequency : 146.520 MHz
Digital code: 12345
The same procedure is used with the TM-3530A.
Station A Station B
1.
Press
the
C.SQ
key.
(C.SQ
indicator
will
light
and
un-
desired
signals
will
not
break
squelch.)
1. Press the DCL key to turn on the DCL system.
RENWOOD T5508.
BS520 »
=<aie
Te FW TRONEEENER
2. Signals of other stations (with different digital access
codes, or no digital code) will not be heard, even
though the S meter confirms their presence.
TENWOOD Tao
foo” |
ps2n
lesicoe ane i
iG o
3. When station B transmits the proper access code, the
C.SQ indicator will go out, and digital squelch will
open.
Three beeps will sound to signal reception of the de-
sired code.
KENWOOD TH2SoOR,
2
520
ait
eee
L&E
eA AWN
a]
ae
3. Press the PTT switch to send the transmit code.
(Code information is sent at the beginning and the end
of each transmission.)
ey) KENWOOD TM-ZSS0A
Coe AE ae
||
Fane! | ab |G
Eznanml
Operating procedure
Operation
Remarks
1. Enter the frequency that you want
open channel searches to begin from
into memory channel A.
KENWOOD TH 25808
=)
BY OT ow
ea "nana rpaneenee | IER
oom
Memory entry is as discussed in previ-
ous sections. The digital channel search
will search up to 11 channels from the
frequency stored in memory channel A (a
total of 12 channels).
(With the TM-2570A/2550A/2550E/
2530A) :
The step size is: 15 kHz (or 20 kHz by
cutting internal diode) for the
TM-2570A/2550A/2530A, and 25 kHz
with the TM-2550E.
Example: When 146.400 MuHz is en-
tered in CH A (TM-2570A/
2550A/2530A) search pro-
ceeds as follows:
1. 146.400
2, 146.415
3. 146.430
12. 146.565
(With the TM-3530A)
The step size is: 20 kHz (or 40 kHz by
cutting internal diode)
Example: When 223.540 MHz is en-
tered in CH A search pro-
ceeds as follows:
1. 223,540
2. 223.560
3. 223.580
12. 223.760
If you have entered a fre-
quency into memory channel
“b", that is one of the fre-
quencies that will be
scanned by the channel
search function, that fre-
quency will not be selected
as the open channel, even if
itis vacant.
Note:
Open channel! search will not
stop on the original fre-
quency under any circum-
stance.

Operating procedure
Operation
Remarks
2. Press the DCL key to switch the sys-
tem ON.
KENWOOD "TM-2S5OA
Aaa en HONSEEICR
Rue!
Pressing once turns the system ON and
lights the DCL system indicator. (Press-
ing again switches the system OFF.)
< When the offset is [S ](Simplex) >
3. Press the CHL key to start channel
linkage operation.
When the key is présséd office, the LCD
indicator flashes and the open channe!
range is scanned. (The frequency display
also displays the open channel being
scanned.) When an open channel is
found, the original operating frequency is
selected and data is automatically trans-
mitted for movement to the open chan-
nel.
lf the C.SQ system of the receiving sta-
tion is on, in conjunction with the DCL
system, you must ensure that the trans-
mit code is the same as his receive code
for proper system operation. If the
codes are the same the DCL system will
operate normally, ie. both radios will be
switched to the open channel.
4. When an open channel is
not found, press the PTT
switch or RESET key to
release the search.
2. if another station is trans-
mitting on the original fre-
quency when the unit re-
turns from the open chan-
nel search, automatic
transmission will not take
place. The radio will enter
a receive mode, in which a
series of three beeps
sounds repeatedly, while
normal receive functions
occur, As soon as the
channel is open you can
initiate the automatic fre-
quency change by simply
pressing the PTT switch.
< When the offset is [4+]or[-|>
3. Press the CHL key to start channel
linkage operation.
omy i
PR
When the key is pressed once, the LCD
indicator flashes and the open channel
range is scanned. {The frequency display
also displays the open channel being
scanned.)
When an open channel is found, the ori-
ginal operating frequency is selected and
the radio will enter a receive mode, in
which a series of three beeps sounds re-
peatedly, while norma! receive functions
occur.
As soon as the channel is open you can
initiate the automatic frequency change
by simply pressing and releasing the PTT
switch. (TM-3530A/2570A/2550A/
2530A only)
The TONE switch must be on for proper
operation. (TM-2550E only)
1. If an open channe! is not
found, press the PTT
switch or RESET key to
release DCL functions.
2, Channel! linkage does not
occur until the PTT switch
is released.
3. Just as when operating in
the simplex mode C.SQ.
system may also be used.
However, some repeater
systems may not pass the
DCL signal properly. This
is due to a time delay in
the repeater, and is nota
fault of the DCL system.
To move to an open channel during communication be-
tween stations A and B at 146.520 Mhz, proceed as fol-
lows. {In this example, 146.520 MHz is the frequency of
operation.)
The same procedure is used with the TM-3530A.
Station A
Example:
Initiating station: Station A
Waiting station
Digital code
Offset
Memory CH A
: Station B
> 12345
: [S}(Simplex}
> 146.400 MHz
Station B
1. Confirm the digital code.
"EM-2ESOA,
Press the CS key to check that the digital code is
“12345”, then press the CS key again.
1. Confirm the digital code.
Press the CS key to check that the digital code is
“12345”, then press the CS key again.
RENWOOD,
TH-BSEOK,
ea FUDOUISCENER
Oia
DOO}.
2. Press the DCL key to swi
KENWOOD. TM 25508
Tama TataeeER
2. Press the
DCL key to switch the DCL system ON.
KENWOOD,
Te-aESOR
3. Press the CHL key.
The CHL indicator flashes and a search for an open
channel begins.
(This example assumes that there is-an open channel
at 146.430 MHz.)
KENWOOD,
TM B550R
3. Standby.
KENWOOD
Tie 2550A,
= aa ae
b52e0 ae
[oso O] lez
fer eeraaees Fo Bee
oo
oi oom LA
4. The original operating frequency (146.520 MHz) is se-
lected and data is transmitted automatically.
KENWOOD "TM-ZSSOR,
oa ae
a “I
£5 we
DoOooM
4. The transmit data of station A is received.
fecal
[ax] {o)
(23) i
5. The radio OSY's to the open channel.
As the movement to the open channel
146.430 MHz)
occurs, the flashing CHL indicator lights continuously
and beep sound is generated to announce the comple-
tion of channel linkage.
KENWOOD.
TM 2EeO
5, The radio QSY's to the open channel.
As the movement to the open channel! (146.430 MHz}
occurs, the CHL indicator lights continuously and
beep sound is generated to announce the completion
of channel linkage.

4-8-6. Recall
The recall function is a channel re-linkage operation. If, in
the previous example, the channel linkage could not be
completed, station A would use the recal! function to
again attempt to bring station B to the open channel
(146.430 MHz).
The same procedure is used with the TM-3530A.
f
Station A Station B
[KENWOOD T2508 KENWOOD. “TH-2E50A
= ==) [e=)(ex|[oan ——
BY AG mw BS2o
TEA ____wovrrrurroenreeee
Old O Dio
Station A operation
Press the CHL key again.
Steps 4 and 5 of the previous section will be repeated.
i You may repeat this operation as many times as neces-
oo |a| era sary, as long as the LCD indicator is ON.
[Coes Ce
ooo G
4-8-7. Reset and return
A. Reset function:
Use this function to move to another open channel after
completing a channel linkage. This function enables
either station to initiate channel linkage by resetting the
CHL system. (This is confirmed by the fact that the CHL
indicator is turned OFF.)
Operating procedure Operation Remarks
1. Press the RESET key.
Pressing once turns the LCD indicator
OFF and releases the channel linkage
operation.
Now, new channel linkage is possible.
ee 2 Ea
zifesl
moe
cy
B. Return Function:
Use if automatic QSY fails on any station you are com-
municating with. For example: stations A and B are co-
municating with each other. Station A initiates the chan-
nel linkage function. However station B is not successful
in the linkage operation. Pressing the RESET key will re-
turn the radio to the original operating frequency with a
simple one touch operation.
Operating procedure Operation Remarks
1. Press the RESET key. Pressing the key again after reset opera-_ | The original operating fre-
tion causes the original channel quency and the open channel
(146.520 MHz) to be displayed. Each are stored into memory at
time the key is subsequently depressed the time the channel! linkage
the display will switch between the ori- operation is originally com-
gina! operating frequency (146.520 pleted.
MHz) and the open channel frequency
(146.430 MHz). Press the CHL key
while the original operating frequency is
displayed and channel linkage operation
will be initiated again.
The same procedure is used with the
TM-3530A.
30
4-8-8. Call sign entry
The TM-3530A/2570A/2550A/2550E/2530A employs
a method of displaying and entering the call sign digit by
digit using decimal ASCII codes. Set the call sign by re-
ferring to the ASCII call sign data.
After the call sign has been entered, it will not be neces-
sary to reenter it as long as you operate the TM-
3530A/2570A/2550A/2550E/2530A.
(However, if the reset (page 15) is depressed or the lith-
ium battery were to fail, reprogramming may be neces-
sary).
Conversion of call sign to ASCII code
Digit : 1 2 3 4
Example: WwW D 6 D
(87) (68) (54) (68)
Operating procedure
ASCII call sign data
W : 87
Space : 32
2:50
5 6
J Y
(74) (89)
6: 54
Operation
Remarks
1. To display the call sign, first press the
CS key and then, the RESET key.
Each time the RESET key is pressed, the
call sign and digital code will be dis-
played alternately.
Referring to the lefthand illustration, 1 of
“1 00” indicates the first digit of the call
sign, WD6DJY, for example.
Whenever the call sign dis-
play has been selected by
pressing the RESET key, the
1st digit of the call sign will
always be displayed.
2. Enter the call sign, referring to the
ASCII table on page 26, using the nu-
meric keypad.
KENWOOD. TH-2550R
eal
ET |e ea
=a
=p |p
ro: SOL, peta
To enter “W”, press [8] then [7] on the
numeric keypad. A short beep will sound
each time you press a key to confirm
data entry and the digit will appear in the
display. A long beep will sound after the
2nd digit of each alphanumeric char-
acter, and the display will change to indi-
cate the next character.
Itis possible to receive, but
not to transmit while enter-
ing the call sign. Attempting
to transmit will cause an er-
ror alarm of three beeps to
sound.
er the remaining characters.
KENWOOD, THA ZEEOR
2 BF
inne | [exienlfery
Termararthansetaren | LE eal ial
Ooty i
Enter the remaining characters using the
key below;
(D) = 68, (6) = 54, (D) = 68, (J}=74, (Y)=
89.
After the final 9 has been entered, the
display will return to the first character
position.
Enter your call sign using the procedures
in step 2 and 3.
To check the call sign data
rotate the MEMORY CHAN-
NEL selector. A beep will
sound each time you display
the first character.
4, Press the CS key to return to the nor-
mal frequency display.
After all digits have been entered, press
the CS key to return to the normal fre-
quency display.
Remember that transmit is
inhibited while entering the
call sign.

4-8-9. DCL system notes
1. Standby digital code
The standby indicator is a visual indication of which
digital access codes will actually open the squelch on
the radio. Simply stated it shows the “Active” codes.
When the indicator is “ON” the code is active, when
the indicator is “OFF” the code is not active, and is ig-
nored,
Fig. 1 illustrates an example code with the standby in-
dicator “ON” {active}.
The code that is displayed when the CS key is pressed
“ON” (called a “Transmit digital code”) becomes an
active code regardless of the standby indicator. For
example, the digital codes as shown in Fig. 2 are
stored in station A’s memory. Digital codes a, b and d
are active codes. If station B transmits the proper
code (a, b or d) he will open the squelch of station A.
When station A receives one of the active digital
codes, the microprocessor will determine if the re-
ceived code matches the current transmit code. If the
codes do not match, the microprocessor will change
the transmit digital code so that it matches the incom-
ming digital code.
For example, if station B transmits a signal with code
d (Fig. 2), the squelch of station A will open. Simulta-
neously, station A’‘s transmit digital code (a in Fig. 2)
will be changed to d. This may be confirmed by press-
ing the CS key. Code d will be displayed.
2. If the CHL indicator CHL is “ON” you will not be able
to initiate, or receive channel linkage information.
This is to prevent accidental channel linkage.
3. Detection of open channel
The DCL system detects the presence of an open
channel by determining if the signal level is below ap-
prox.—14 dBy (0,2 uv) for approx. 1.5 seconds, Occa-
sionally, channel linkage may occur on a busy channel
due to transients in the microprocessor.
4. Automatic transmission of channel linkage data is not
performed after finding an open channel, if another
station is transmitting on the original channel at the
time the radio returns to the original channel. The ra-
dio will enter the receive mode, and waits for a com-
mand to send the data.
5. Channel linkage during scan operation
Channel linkage cannot be actuated during scanning.
32
2
faau
mecS
keyis
ON,
5
a
on
|
pat
tet
«
f
t
ruma
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TIE
{
{
74
(47
‘fr
1ogo
«
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a
ie
eee
a
et
ee
|
r
a
<Fig.2>
. Normal transmission using PTT switch
When the DCL switch is ON, data is transmitted for
approx. 0.2 seconds at the beginning and at the end-
ing of the transmission: Wait a short period before
start talking after this moment.
. Offset switch
When the |OS| key is not set to simplex, automatic
transmission of DCL data from the origina! frequency
does not occur, Pressing the PTT switch manually
transmits data and causes movement to the open
channel.
. When channel linkage is initiated, the original operat-
ing frequency, offset and tone frequency are stored
into memory. The open channel operates in simplex
with no tone, regardless of original settings.
5.
MAINTENANCE
AND
ADJUSTMENT
5-1. GENERAL INFORMATION
Your
transceiver
has
been
factory
aligned
and
tested
to
specification
before
shipment.
Under
norma!
circum-
stances,
the
transceiver
will
operate
in
accordance
with
the
instructions
in
this
manual.
if
your
transceiver
fails
to
work,
contact
the
authorized
dealer
from
which
you
purchased
it
for
quick,
reliable
re-
pair.
All
adjustable
trimmers
and
coils
in
your
transceiver
were
preset
at
the
factory
and
should
only
be
readjusted
5-2. SERVICE
Should it ever become necessary to return the equipment
to your dealer or service center for repair, pack it in its
original box and packing, and include a full description of
the problems involved. Also include your telephone
number. You need not return accessory items unless dir-
ecily related to the service problem. If you do include ac-
cessory items please list them in your correspondence.
You may return your radio for service to the Authorized
TRIO-KENWOOD Dealer from whom you purchased it. A
copy of the service report will be returned with the unit.
Please do not send sub-assemblies or printed circuit
boards. Send the complete unit, in its original boxes and
packing.
Tag
all
returned
items
with your
name
and
call
for
identi-
fication.
Piease mention the model and serial number of your ra-
dio in any correspondence, whether phone or written.
For future reference, record this information in the space
provided on the back cover of this manual.
Service note:
Dear OM, if you desire to correspond on a technical or
5-3. CLEANING
The knobs, front panel and cabinet of the transceiver are
likely to become soiled after extended use. The knobs
should’ be removed from the transceiver and cleaned
by
a
qualified
technician
with
proper
test
equipment.
Attempting
service
or
alignment
without
factory
authori-
zation,
may
void
the
warranty.
When
operated
properly,
the
transceiver
can
give
years
of
service
without
requiring
realignment.
The
informa-
tion
in
this
section
gives
some
genera!
service
proce-
dures
which
can
be
accomplished
without
sophisticated
test
equipment.
operationa!
problem,
please
make
your
note
short,
com-
plete,
and
to
the
point.
And
PLEASE
make
it
readable.
Please list: Model and serial number.
The question or problem you are having.
Please
give
sufficient
detai!
to
diagnose:
other
equip-
ment
in
the
station,
meter
readings
and
anything
you
feel
might be useful in attempting diagnosis.
Notes:
1.
Record
the
date
of
purchase,
serial
number
and
dealer
from
whom
purchased.
2.
For
your
own
information,
retain
a
written
record
of
any
maintenance
performed
on
the
unit.
3.
When
claiming
warranty
service,
please
include
a
photocopy
of
the
bill
of
sale,
or
other
proof
of
pur-
chase
showing
the
date
of
sale.
Caution: .
Do
not
pack
the
equipment
in
crushed
newspapers
for
shipment!
Extensive
damage
may
result,
during
ship-
ping.
with
a
neutral
soap
and
warm
water.
Use
a
neutral
soap
(not
harsh
chemicals)
and
damp
cloth
to
clean
the
cabi-
net
and
front
panel.
5-4.
MICROPROCESSOR
BACK-UP
LITHIUM
BATTERY
REPLACEMENT
Z
5-5. ORDERING SPARE PARTS
When
ordering
replacement
or
spare
parts
for
your
equipment,
be
sure
to
specify
the
following:
Model
and
serial
number
of
your
transceiver.
Schematic
number
of
the
part.
Printed
circuit
board
number
on
Lithium
battery
replacement
should
be
performed
by
an
authorized
TRIO-KENWOOD
service
facility;
either
your
TRIO-KENWOOD
dealer,
or
the
factory,
since
this
unit
contains
CMOS
type
circuitly.
Note:
When
the
lithium
battery
is
replaced,
the
microprocessor
must be reset, using the procedure on page 35.
which
the
part
is
located,
part
number
and
name,
if
known,
and
quantity
desired.
Part
numbers
for
most
re-
placement
parts
is
contained
in
the
service
manual
(avai-
lable
as
an
option
from
your
dealer).

j
Call
si
ite
:
.
:
test
pins
monn
5-6-7.
TO
(Timer
Operated)
scan
timer
(Upper case} (Lower case)
Final unit
Top view
5-6-1. Cover removal
For
each
of
the
upper
and
lower
cases,
remove
four
screws
as
shown
in
the
illustration.
Be
careful
of
the
speaker
wiring
on
the
upper
case.
Cautions:
4.
Before
removing
the
cover,
turn
the
DC
power
sup-
ply’s
power
switch
OFF
and
disconnect
the
power
ca-
ble.
2.
Do
not
pinch
wiring
when
opening
or
closing
covers.
Notes:
The
following
cautions
pertain
for
the
adjusting
points.
1.
Never
touch
adjustment
points
other
than
those
indi-
cated
by
the
instructions.
2.
When
adjusting
or
cutting
a
part,
avoid
contact
with
nearby
parts.
5-6-2. Low power output
Adjust
VR4
on
the
Final
unit
to
the
desired
power
level.
Adjustment
is
possible
up
to
SOW
with
the
TM-2570A,
40W
with
the
TM-2550A/2550E
and
20W
with
the
TM-3530A/2530A.
5-6-3. Microphone gain
VR7 for microphone gain control.
5-6-4, DTMF level
Adjust VR1 (X60-1280-10) to the desired level.
5-6-5. Sidetone and beeper level
The autopatch sidetone level during and beeper level
transmit are adjustable. As the volume is advanced, the
level increases.
1. Adjust the VOL control to your normal listening level.
2. With the PTT pressed any key on the keyboard switch
depressed, adjust VR2.
5-6-6. RF power meter
Adjustment is required after adjusting the low power out-
put. VR4 for RF power meter.
wnnnee
4
x834la90-10
Bottom view
Microprocessor reset pins
The
scan
timer
is
factory
preset
at
approximately
5
se-
conds.
This
can
be
adjusted
from
3
to
15
seconds.
1.
Place
the
SCAN
switch
to
TO.
2.
Turn
the
SQL
control
fully
counterclockwise
to
open
the
squelch.
3.
Press
the
M.CH
switch
to
select
memory
mode.
4.
Initiate
scan
by
pressing
the
SC
key.
5.
Adjust
VR1
(X53-1440-10)
to
the
desired
delay.
5-6-8.
Open
channel
search
step
size
selection
(TM-3530A/2570A/2550A/2530A
only)
Cut
the
diode
D22
to
change
the
open
channel
search
step
size
for
channel
linkage
from
15
kHz
to
20
kHz
(from
20
kHz
to
40
kHz
with
the
TM-35304A)
steps.
Note:
When
the
diode
(D22)
is
cut,
reset
the
microprocessor
using
the
procedure
on
page
15.
5-6-9.
Microphone
UP/DWN
step
size
and
scan
step
size
selection
(TM-2550E
only)
The
microphone
UP/DWN
step
size
and
scan
step
size
can
be
changed
to
12.5
kHz
by
cutting
D12
on
the
con-
trol
unit
(X53-1440-10).
However,
frequency
entry
by
use
of
the
numeric
keypad
is
still
possible
in
either-5
kHz
or
12.5
kHz
steps.
Note:
When
the
diode
(D12)
is
cut,
reset
the
microprocessor
using
the
procedure
on
page
1
5.
5-6-10.
Microprocessor
reset
pins
When
the
microprocessor
reset
using
the
procedure
on
page
15
is
unable
or
the
lithium
battery
is
replaced,
short
these
two
pins
while
depressing
the
PS
key.
5-6-11,
Call
sign
monitor
test
pins
The
test
pins
are
short-circuited
to
monitor
the
own
call
signal
when
the
Call
Sign
Display
option
is
used.
Be
careful
of
noise
interfering
with
the
reception
due
to
this
operation.
QA
35

6-2. TM-2570A
6. BLOCK DIAGRAM
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