Kenwood TR-7850 User manual

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INTRODUCTION
You are the owner of our latest product, the new TR-7850 transceiver. Please read this instruction manual
carefully before placing your transceiver in service. The unit has been carefully engineered and manufactured to
rigid quality standard, and should give you satisfactory and dependable operation for many years.
AFTER UNPACKING
* Shipping container:
Save the boxes and packing in the event your unit needs to be transported for remote operation, maintenance,
or service.
* The following explicit definitions apply in this manual:
Note: If disregarded, inconvenience only, no risk of equipment damage or personal injury.
Caution: Equipment damage may occur, but not personal injury.
CONTENTS m ACCESSORIES
ACCESSORIES ........... 2 Carefully unpack your TR-7850 and check that it is supplied
FEATURES essas iron AE asd ia 3 with the following accesories:
SPECIFICATIONS.... 4 Ha memio: micro phone: tip Mteh nO
SECTION 1. INSTALLATION (790-0313-05) DEE AR AR NR DR ERRA e 1 piece
(2) Mounting Bracket
1.1
Interconnection.............
5
Mounting
parts:
1.2 Mobile Installation ............... 5 Hex wrench (W01-0401-04) ......... 1 piece
1.3 Fixed Station Installation ..................... 6 Nuts (5 mm diameter)
1.4 Back-up Power... 7 Ah Goi-ifo for À RD PR 4 pieces
SECTION 2. CONTROLS AND TERMINALS FIex-SOERDE Seraiy |
Sa BONE DERA so ini aaa ia Ra 8 (NO9-0008-04)............... Ene a an 4 pieces
Flat washers (6 mm diameter)
2.2 Rear Panel... 10 (N15-1080-46)... 4 pieces
SECTION 3. OPERATION Spring washer (6 mm diameter)
3.1 Generals... 11 ENT6:0000-26) saias aims era 4 pieces
3.2 Memory Input... 11 (3) Feet
3.3 SCAN (Busy stop) Operation ...................... 12 Rubber foot (small. rear) |
34 PRIORITY OPER Switch 12 (102-0069-05) assim nica cianiaueciaeradinsios 2 pieces
Rubber foot (large, front)
3.6 TX OFFSET and REVERSE........................ té (J02-0070-05)........i 2 pieces
3:6 AUTO PATCH Operation ........................... 12 Screw (N30-3006-46) .......... 2 pieces
Sd OQUELCA cessa iso imita sas and sb ssa lia 12 Screw (N30-3008-46) ..........ciii iii 2 pieces
3.8 HI/LOW Switch... 12 (4) DC power cord (with 2P plug and fuse)
39 MOLOÊ suas si Bi iss dei ai 13 (E30-1685-05) ..........ss sc ei siersecerreesesesereeeeneeess 1 piece
3.10 TONE Switch... 13 o) apaie mS6! NOR) APOR- 09 10h ita snisini nRreco
3.11 Adjustments ............ 13 HeuNAniatUro plug Mor exeral epeanem
ii oAo 6/26 280 [57 RPE PN 1 piece
SECTION SAD DONA INFORMADON siomi IS (OVA CARO: sonia qrad inicio ind 1 copy
SECTION
5.
OPTIONAL
ACCESSORIES................
14
(10)
Instruction
manual...
1
copy
SCHEMATIC DIAGRAMS ............. 15 E
BLOCK DIAGRAMS ............. 16

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e 15 MULTIFUNCTION MEMORY CHANNELS, EASILY e BUILT-IN AUTOPATCH DTMF ENCODER
SELECTABLE WITH A ROTARY CONTROL Keyboard operates as autopatch encoder to access
M1—M13.. memorize frequency and offset (+600 kHz repeater autopatch.
or simplex) | e FRONT-PANEL KEYBOARD
M14,MO..... memorize transmit and receive frequencies
ly
f
dard
off
For
frequency
selection,
transmit
offset
selection,
independently
an
gd
memoneprograimiina,
Soap
control-ahd
sélacdon-d!
MO
amctasêaas
priority
channel
with
simplex,
+6
z,
or
Disss
tel
rancodaR
doca
nonstandard offset operation.
e INTERNAL BATTERY BACKUP FOR ALL MEMORIES
All memory channels (including transmit offset) are
retained when four AA Ni-Cd batteries (not KENWOOD
supplied) are installed in battery holder inside TR-7850.
Batteries are automatically charged while transceiver is
connected to 12V DC source.
e PRIORITY ALERT
MO memory is priority channel.
e EXTENDED FREQUENCY COVERAGE
143.900 — 148.995 MHz in switchable 5 kHz or 10 kHz
steps, allowing simplex and repeater operation on many
MARS frequencies.
cd a a a
BEFORE USE
e AUTOSCAN
Entire band (5 kHz or 10 kHz steps) and memories.
Automatically locks on busy channel; scan resumes
automatically after several seconds unless CLEAR or mic
PTT button is pressed to cancel scan.
e SEPARATE DIGITAL READOUTS
To display frequency (both receive and transmit) and
memory channel.
e SELECTABLE POWER OUTPUT
40 watts (Hi)/Low Power (1 to 15W)
e BUILT-IN PIEZO-ELECTRIC BUZZER
Do not adjust coils, trimmers, or pots!
After parking in the sun, and inside temperature is HOT,
cool this unit BEFORE transmitting.
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BEFORE connection, check polarity. Keep equipment away from heat and out of direct sunlight.

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SPECIFICATIONS
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[General]
Semiconductors .................ci sr MPU 1
ICs 19
Transistors 60
FETs 9
Diodes 77
Frequency range .................css isso 144.000 to 147.995 MHz
Frequency synthesizer............................ Digital control, phase locked VCO
NGdO sera ea O FM (F3)
Antenna impedance ...........................s.... 50 ohm
Power requirement .......................cis... 13.8V DC +15%
CrOUNdINO) ixsesiass ir a O Dig Negative
Operating temperature............................. — 20ºCto +5OºC
Currentdralh
ss
ses
si
alga
0.4A
in
receive
mode
with
no
input
signal
9A in HI transmit mode (Approx.)
Less
than
3
mA
for
memory
back
up
(from
an
external
power
supply
through the back up terminal)
Less
than
2
mA
for
memory
back
up
(from
battery)
DIMCNSIONS spa A 175 mm (6-7/8") wide
64 mm (1-1/2") high
220 mm (8-5/8”") deep
(projections excluded)
CTT
|
|
RR
RD
RR
RR
2.2
kg
(4.84
Ibs)
(approx.)
[Transmitter Section]
RF output power (at 13.8V DC, 5012 load) ..... HI 40 Watts min.
LOW 1 to 15 watts approx. (According to FREQ.)
ModulatóON siso es ari Variable reactance direct shift
Frequency tolerance.......................s... Less than +20 x 10
( — 20ºC— + 50ºC)
Spurious radiation...................ccssss sie HI Less than — 60 dB
LOW Lessthan — 53 dB
Maximum frequency deviation (FM)............. +5 kHz
MICTODHONE
ssa
erissras
aaa
its
ana
sia
Dynamic
microphone
with
PTT
switch,
5009
[Receiver Section]
CIFCUITIV sara sina OD A Double conversion superheterodyne
Intermediate frequency ................................ Ist IF 10.695MHz
2nd IF 45b5kHz
Receiver
sensitivity
....................
Better
than
0.5uV
for
30
dB
S/N
Better than 0.2uV for 12dB SINAD
Receiver
selectivity
.................c
More
than
12kHz
(—
6dB)
- Less than 24 kHz ( — 60dB)
Spuriour response ........................ccsssee. Better than 60 dB
Squelch sensitivity ....................sc 0.16uV (threshold)
Auto scan stop level...................cc Less than 0.2uV (threshold)
AUdIO
OUIDUÊ
mussi
ssarase
pes
prniaseda
isa
ia
unas
More
than
2.0
watts
across
8
ohm
load
(10%
dist.)
Note:
Circuit
and
ratings
are
subject
to
change
without
notice
due
to
developments
in
technology.

SECTION 1
00080 «0000000000,
1-1 Interconnection
Connect the antenna and power supply as shown in Fig.
1-1 for fixed station.
1-2. MOBILE Installation, [general]
* Installation location
Using the supplied mounting bracket, install the transceiver
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INSTALLATION
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*- Power supply
Connect the supplied power cord with fuse directly to the
battery terminals. Connecting to the cigarette lighter socket
can cause a poor connection, and excessive voltage drop.
* Ignition noise
The transceiver is designed to suppress ignition noise;
however, if excessive noise is present, it may be necessary
to use suppressor spark plugs (with resistors).
under the dashboard or on the side of the console in your
car. Mount the unit for safe operation: easy keyboard
access, and display visibility.
Refer to Fig. 1-2A and Fig. 1-2B.
If your car is equipped with an electronic fuel injector, the
transceiver should be as far from the control equipment as
possible.
Antenna installation
Various types of antenna for 2 meter mobile operation are
available. (See Fig. 1-2C)
NOTE:
For gutter-mount installation, the antenna bracket must be
grounded to the car body as shown in Fig. 1-2C. Affix the
antenna securely, referring to the antenna instruction.
Regulated power supply (10A or more)
O) O) KPS-12
Fixed station operation
2
4
Ep sss0 00101 A
VBR RBLRaaIatAaRARaat
lh)
GLISDISLISSSSASISISISISSDISSDISISISTSSSS SS,
/
BC-1 (120V AC)
(WO09-0008-05)
L0MOOISOSISSSSIASSSS ADIADO DISSO 4)
9
A
DC power
E E terminal
(E
[e]
(o)
Connect battery to DC power terminal.
For detailed instruction, see page 6.
UHF type
connector E ANT
EA u
ANT terminal
DDD DDD DDD
Coaxial cable
AN y 77)
For mobile antenna installation,
see page 6.
Mobile station operation
Fig. 1-1 Antenna and Power Supply Connections

1-3. FIXED STATION Installation, [general]
*- Power supply (Fig. 1-3)
A regulated DC power supply (13.8V DC, 10A or more) is
required.
* Antenna (Fig. 1-3)
Various types of fixed station antennas are commercially
A. Installation position
Mounting
bracket
Underside of
dashboard
Sideof
console
Drill holes in the bottom of
dashboard. Secure the mounting
bracket with screws and nuts.
The transceiver should be away |!
nt
from your knees.
* Pass through the rear
window.
Gutter-mounted
whip antenna
C. Antenna Installation
Antenna bracket
Remove the paint to insure
grounding to the car body.
Front fender
Trunk lid system
Be sure to use a 2m mobile antenna.
Fig. 1-2 Installation for Mobile Operation
D. Coaxial cable connections
* Insert through the bonnet.
* Connect Directly to the battery terminais.
available, Select your desired antenna according to your in-
stallation space and application.
Note that the SWR of your antenna should be less than 1.5.
A high SWR will cause the TR-7850 protective circuit to
operate, reducing the transmit output power.
Flat washer
Spring washer
Insert the transceiver into the
mounting bracket.
Adjust the installation angle and fully tighten 4 bolts using the hex wrench.
* Pass through the door fitting.
The cable can be inserted easily
ifthe door cushion soft. Note
that rain water may enter along
the cable.
Coaxial cable
E
* Use a Drip-loop if possible.
7
ii
Lift
the
trim
plate
and
install
the
A cable.
TR-7850
MUDA.
e” Coaxial cable
To antenna
grommet
Ui
Es /
Battery RE EN
É To battery

1-4. Back-up Power
WI
HI
.
Em EA
1. With power supplied directly from the car battery, the
micro computer continues operating even when the
power switch is OFF. 7 7
Current drain is very low, approximately 2.5 mA. | Remove 4 screws |
2. If you wish to retain the memories even when moving —
the unit between the car and the fixed station, utilize a |
battery back-up system. Otherwise, all the memories
are cleared when the power cord is disconnected. S NãO) |
[Battery Back-up] oa, | |
(1) Use four AA NiCd batteries, available Locally. o o Ff T71
(2) Open the lower cover of the transceiver. O O eg pes !
(3) Install the batteries into the battery case located (JH) a ER:
on the left side, making sure that polarity is cor- A j |
rect. & S [ope
(4) The batteries are charged regardless of the power e RR |
switch position. Install 4 AA | oo Ro
Charging current is about 15 mA. The battery Ni-Cd batteries a
back-up function operates only when the power
cord is disconnected.
3. Back-up is available for about 3 to 5 days. To extend
the back-up period, connect the (optional) BC-1 to the
external back-up terminal.
INOTE]
1) Remove the batteries if you don't intend to use them for
a long period of time.
Fig. 1-4 Battery Back-up
1.
Power
supply
connection
Regulated
DC
|
Standard
voltage:
13.8V
DC
k
ower
supp!
2.
Connection
of
itv:
Regulated
power
supply
p
pply
SS
e
fes
Current
capacity:
More
than
10A
NOTE:
Preferably, voltage should be
TR-7850
el Õ adjustable between 12V and
el Tee eng
| || A * The regulated supply should
> be equipped with a built-in
1, 24 - A a 2 ê
ram em protection circuit for both
Antenna installation overcurrent and overvoltage.
(example) CAUTION:
Battery charging power supplies
cannot be used.
SP-120 TR-7850
Transceiver performance
| depends largely on the type of antenna
Yagi antenna (stacked) used. For fixed station operation,
there are gound plane antennas
(omni-directional) and Yagi antenna
| Ground plane (uni-directional). The Yagi antenna
| antenna is suitable for long distance
operation (DX) or communication
Coaxial cable | with a specific party
(having excellent directivity and
high gain). An omni-directional
antenna is generally used for local
operation.
Regular antenna
Regulated power supply
Antenna select
switch
—>» Yagi antenna
—» Ground plane
antenna
Control cable
It is convenient to install both
Yagi and ground plane antennas
for selectable use.

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Ê
POWER
OFF
& xenwooo
2-1. Front Panel
1. VOL/POWER
Power ON-OFF switch and volume control are combined.
Turning the control fully counter clockwise will turn the
power OFF. Clockwise rotation will increase the volume.
In the power OFF position, about 2.5mA current is drawn to
back-up the micro-computer and about 6maA of leakage cur-
rent for final module, provided the power cable is connected
to a constant power source.
To completely disable the transceiver, disconnect the power
cable.
2. SQUELCH
The squelch control is used to eliminate noise during no-sig-
nal time. Normally, this control is adjusted clockwise until
the noise disappears and the BUSY indicator goes off
(threshold level). For scan operation, this control must be
set to the threshold point.
3. TX Shift Indicator
+ (RED): By pressing the key on the keyboard
(11), the indicator will light, indicating that
transmit frequency is switched up 600 kHz
from the receive frequency.
SECTION 2. CONTROLS AND TERMINALS
O e 0000 + oO00O = 00000 a 0000 = CO00DO=cB0ODO= 000000 -c0O00O = 00000 =c00L0O- 000000 -000000-00000D-000000- 0000 -ADO0OD= 000000 -O0UDO-4DUNDO=CONUDD=COODO=CBU0OD=C000DD=CONODO-ABUUTD=4TU0HO-CQUODO 0 L0ODO 0 N000D=ABU0D-CONNDO=CONUDO=0DACHD-AGOLOD=COOODD- CONGO = CBO LD =cA0UDD=ANULDD=CNOLDD=COUODO=CTO0DO 000000 = 000000 -C0D0DO-CLDODD-C0000D=A00OHD- 000000 -0D0000”
de
PRIORITY —
ALERT
S (YELLOW): By pressing the key on the keyboard
$(11), the indicator will light, indicating that
the transceiver is operating in the simplex
mode.
by pressing the (-) key on the keyboard
$(11), the indicator will light, indicating that
transmit frequency is switched down 600
kHz from the receive frequency.
— (RED):
4. Frequency Display
This LED frequency display indicates the operating
frequency in 4 digits (MHz-kH2z).
Example: 146.940 MHz is indicated as “6.940”.
5. BUSY Indicator
This. lamp will light when the squelch is open in receive
mode.
6. S/RF Level meter
This LED level meter indicates receive input signal strength
(in S units) or transmit output (RF).

7. ON AIR Indicator
A light emitting diode (L.E.D) will light during transmit
mode.
8. CH Indicator
This indicates the channel No., O through 14, in 2 digits.
9. HI/LOW Switch
This switch is used to set transmit output power to either
40W (high) or low power (1 to 15W).
Power is high at the normal out position (HM), and is low at
the in position (mm). (refer to Page 13)
10. MIC Connector (6-pin)
For connection of the supplied microphone.
(3) DOWN
(Blue)
UP (4)
(Red) (2) STBY
(Back)
GND (6)
(Braid) (1) MIC AUDIO
NC (5) (White)
MIC connector from FRONT PANEL (lead color)
11. Keyboard
The keyboard has the following functions (Refer to
“SECTION 3. OPERATION"):
— (0) (Number keys):
Depress four keys to set the desired operating frequency.
Depress the (5) . (5). (4) and (0) keys.
The frequency display will indicate “6.940”
(146.940 MHz).
The number keys function as auto-patch keys
during transmit mode.
(+ shift key):
After setting the operating" frequency, depress this key.
The transmit frequency will be offset 600 kHz up from
the receive frequency.
(Simplex key):
Depress this ky and the transceiver will remain in
simplex mode (transmit and receive frequencies are the
same).
(=) (— shift key):
After setting the operating frequency, depress this key.
The transmit frequency will be offset 600 kHz down
. from the receive frequency.
(Memory key):
This is used to input the desired frequency (including
+600 kHz offset) to each channel for memory.
Press the key and a check-tone will be heard.
(Clear key):
By pressing this key, the frequency set by the number
keys is cleared. When cleared, the frequency display
will indicate the frequency that was displayed before
the last entry was cleared. Use this key you have
mistakenly entered setting this key is also used to
release the scan operation.
Example:
(Scan key):
This is used for scan operation. Press the key when the
SQUELCH (2) is ON. This will start auto-scan or memo-
ry-scan depending on the position of the KEY/M. SEL
switch and STEP switches.
Auto Patch:
During transmission, keys, 1 — 9, * and É operate
DTMF. Keys(3) (6) (5) will operate fourth column
in conjunction with the REV switch.
12. KEY/M. SEL Indicator
This indicates the position of the KEY/M. SEL switch. The
KEY indicator will light when the switch is depressed (mm),
and the M. indicator will light in the out position ( E).
13. KEY/M. SEL Switch
This switch is used to select the method of setting
frequency, either by the keyboard or the memory. In the
(-m ),in position, the operating frequen-y is set by the
keyboard; in the normal out position ( HM ),the operating
frequency can be set by using the MEMORY channel
selector (16).
14. STEP Switch
Use this switch to select the steps (HH: 10 kHz, mm : 5kHz)
during frequency scan or microphone UP/DOWN operation.
15. REV Switch
In receive, this switch is used to reverse the repeater shift
(+600 kHz) and other transmit/receive frequencies (CH O,
14). Itis a momentary non-lock type switch and returns to
the normal out position when released.
In transmit, this switch shifts DTMF tones on column 3 to
column 4 (ABCD) function.
16. MEMORY Channel Selector
This switch is used to select one of 15 memory channels. Of
these, channels 1-13 store frequencies including +600kHz
offset. The other two channels, 1 and 14 are “ODD slit”
channels, storing transmit and receive frequencies
individually.
Channel “'O' is the priority channel.
17. PRIORITY ALERT Switch
This switch is used to check the priority, channel “0”.
Depress the switch and the priority channel will be checked
at about a 6 second interval regardless of the KEY/M. SEL
switch position. A tone sounds when the priority channel is
in use.
18. PRIORITY OPER Switch
This switch is used to call-up the priority channel “O”. By
depressing the switch, operating frequency is switched to
the priority channel.

19. TONE Switch
The tone switch is for control of a user-supplied tone
generator (not available from TRIO-KENWOOD).
2-2 Rear Panel
20. ANT Terminal
Antenna terminal. Connect an antenna of 5O ohms
impedance.
10
21. DC Power Terminal
DC power input terminal. Connect the supplied power cord
with plug. Input voltage is 13.8V DC.
Observe plus ( + ) and minus ( — ) polarity!
22. EXT. BACK-UP
External power back-up terminal to retain the memories.
For internal back-up operation, install four AA NiCd
batteries in the built-in battery case. Use this terminal to
retain the memories for a long period of time (more than 1
week), or with the power cord disconnected.
23. EXT. SP Terminal
External speaker terminal. Connect an 8 ohms speaker using
the supplied plug.
24. DWN Switch
This switch is used to step the operating frequency down
during both keyboard and MEMORY Channel operation.
When pressing the switch, a tone will sound.
When the UP or DWN switch is held on, frequency shifts
rapidly.
Pressing both the UP and DWN switches simultaneously
results in stopping the frequency control operation.
25. UP Switch.
This switch is used to step up the operating frequency in
both keyboard and MEMORY channel operation.
When pressing the switch, a tone will sound.
26. PTT Switch
Press-to-talk switch used for transmission. This will also
release scan operation.

qem mem mm
a ac cc O mc ia
Lo SECTION 3 OPERATION ||
3-1 General (4) Input the shift mode.
1. This transceiver uses a PLL synthesizer controlled by
micro-computer.
The operating frequency can be
shifted in either 5 kHz or 10 kHz steps.
2. The transceiver covers a wide frequency range of
143.900 to 147.995 MHz (which includes some MARS
frequencies).
3. Operating frequencies can be set by simply pressing the
keys on the keyboard. Frequencies can also be stored in
the (15) memory channels.
4. Transmitter precautions
(1)
The TR-7850 antenna impedance is 50 ohms. Be
sure to connect an antenna of 50 ohms
impedance.
(2) Check the transmit frequency before operating to
insure that you do not interfere with other
stations.
(3)
By pressing the microphone PTT switch, the
TR-7850 is set in transmit mode; the ON AIR
indicator will light and the meter indicates
transmit power. Hold the microphone about 5 cm
from your mouth and speak.
5. Micro-Computer Reset (At first power-up)
If, at initial TURN — ON, an erroneous or incorrect read-
out is displayed, reset the MICRO — COMPUTER.
This is not an equipment malfunction.
(1)
(2)
Disconnect the power plug from the DC power
terminal (21) and after about five seconds recon-
nect the power plug.
Turn on the power switch (1).
BACK-UP BATTERIES INSTALLED
First remove the batteries, and reset the
MICRO — COMPUTER as previously described.
Reinstall the batteries.
3-2 Memory Input
The TR-7850 has two different memories; normal memory
and split channel
channel).
memory (including priority memory
1. Normal memory (CH 1-13)
Example: To store 146.940 MHz ( — 600 kHz shift) in
CH 5,
(1) Set the KEY/M.SEL switch to the KEY position
(mm).
(2) Set the MEMORY channel selector (16) to the CH
5 position.
(3) Enter the frequency.
[DISPLAY]
Frequency before
input:
a) Press the (6) key (MHz digit)............. [2
b) Press the (9) key (100 KHz digit)....... 50
c) Press the (4) key (10 kHz digit)......... BS
d) Press the key (1 kHz digit)........... 5940
(Simplex operation)
Press the (-) key (the indication changes from “S”
to “ — “9.
(5) Store the frequency in the memory.
Press the key.
A tone will sound, indicating data entry.
Change the channel and input other frequencies in
the same manner.
Notes: (MEMORY input)
a.
To
input
MHz
digits,
use
the
3
through
8
keys.
b.
When
the
MHz
digit
is
3,
use
only
the
9
key
to
the
input
the
100
kHz
digit.
c.
When
a
wrong
frequency
is
input
in
error,
press
the
key
to
clear
the
frequency.
The
frequency
display
will
indicate
the
previous
frequency
before
the
last
input.
Reenter
the correct
frequency
by
again
pressing
the
keys,
starting
with
the
MHz
digit.
d.
When
the
1
kHz
digit
keys
((D)-(4))
are
pressed,
the
frequency
display
indicates
4.
When
the
((5)-(9))
keys
are
pressed,
the
display
indicates
5.
e.
Do
not
press
any
other
key
until
the
correct
fre-
quency
is
input.
The
transceiver
holds
the
previous
frequency
until
the
new
frequency
is
input.
Notes: (GENERAL)
tg
If
you
wish
to
change
the
shift
mode
from
simplex,
press
the
shift
key
for
the
desired
offset.
2.
For
frequencies
outside
the
144.00
—
174.995
MHz
amateur
band,
the
transceiver
operates
in
simplex
mode
independent
of
the
or
(=)
keys.
3. When the transmit frequency is offset (+600 kHz
and is outside the amateur band, the transceiver
will operate thusly:
Indication
EM
Bar
pda
.
(
|
a,
Pressthe (=) key: SS: UInn
(Us Ls
Shift mode is indicated.
Ea L! (mm
pese de MULA LS
TE
Press the key:
Frequency is out-of-band and is not
stored in memory.
(Tone does not sound.)
Transmit: Mode changes to simplex, pressing
the PTT switch.
(Tone sounds at this time.)
Receive:
Remains
in
simplex
mode
at
PTT
release.
The
simplex
frequency
can
now
be
memorized.
11

2. Split channel memory (CH O, 14)
Example: To store 146.580 MHz receive and
147.660 MHz transmit in CH 14,
proceed as follows:
1. Set the KEY/M.SEL switch (13) to the KEY position
(mm ).
2. Set the memory channel selector (16) to CH 14.
3. Enter the receive frequency.
input:
a) Press the (E) key (MHz digit)...........
b) Press the key (100 KHz digit)....
c) Press the key (10 kHz digit)....... h.
d) Press the (O) key (1 kHz digit).........
E im
nO
pn
Dm
Note:
For frequency input precautions, refer to “Notes”
in the preceding section.
(4) Store the receive frequency in memory.
Press the key.
A pulsed tone will sound, indicating transmit
frequency is ready to be accepted.
Note:
1. The tone will sound intermittently until the
transmit frequency is stored in memory.
2. When the receive frequency is stored,
transmit frequency before the split (CH 14) is
indicated.
(5
—
Enter the transmit frequency.
a) Press the key (MHz digit)............ 7
b)
Press
the
(E)
key
(100
kHz
digit)......
25
c) Press the (E) key (10 kHz digit)........ 156
d) Press the (O) key (1kHz digit)......... 1565
(6) Store the transmit frequency in memory.
Press the key (tone stops.)............... 65H
The transceiver is now ready for split frequency
operation.
Set the KEY/M. switch (13) to the M.position( HH).
NOTE:
After the transmit frequency is stored, the frequency
display indicates the receive frequency previsouly set by
step (3).
3. Memory channel operation
With the KEY/M.SEL switch in the M. position (HH).
the transceiver operates on the frequency set by the
MEMORY
channel
selector
(16).
4. Changing memory frequencies.
If you wish to change any memory frequency, store a
new frequency in that channel using the above proce-
dures. The old frequency is erased when the new
frequency is stored.
3-3 SCAN (Busy stop) Operation
The SCAN operation is devided into keyboard scan, memory
scan and priority channel scan. For SCAN operation, the
squelch control should be advanced to the threshold point.
See section 3.7, Squelch.
12
Frequency before
* KEYBOARD SCAN
1.
Set
the
KEY/M.SEL
switch
(13)
to
the
KEY
position
(am).
2. Depress the key. Scan starts automatically in 10
kHz or 5 kHz steps depending on the position of the
STEP switch (14).
3. When a signal is present, scanning stops. Scan restarts
automatically after about 5 seconds.
4. To release the scan, press the key (or the microphone
PTT switch.
- MEMORY SCAN
1.
Set
the
KEY/M.
SEL
switch
(13)
to
the
M.
SEL
position.
2.
Depress
the
key.
The
memory
channels
are
scan-
ned.
Scan
stops
and
restarts
the
same
as
in
keyboars
scan.
- PRIORITY CHANNEL SCAN
Depress the PRIORITY ALERT switch (17). Regardless of
the KEY/M. SEL switch position, a tone will sound and the
BUSY indicator (5) will light at about 6 seconds intervals if
the PRIORITY channel is in use. Traffic on the PRIORITY
channel will also be mommentarily heard.
3-4 PRIORITY OPER Switch
To
call-up
the
frequency
stored
in
the
priority
“O”
channel
depress
the
PRIORITY
OPER
switch
(19).
3-5 TX OFFSET and REVERSE
After setting channel frequencies by the keyboard, press the
or (=) key. Transmit frequency will be offset plus or mi-
nus 600 kHz from the receive frequency and the TX shift
indicator (3) will display the offset.
By pressing the REV switch (15), the transmit and receive
frequencies will be reversed. If, at this time, the transmit
frequency is beyond the amateur band frequency, a tone will
sound and the transceiver is automatically in simplex mode.
When the REV switch is pressed, the frequency indicated on
the display is also reversed, but the TX shift indicator (3)
will not change.
3-6 AUTO PATCH Operation
With the PTT switch depressed, the keyboses operates in
DTMF. Tone signals will be transmitted for auto patch
operation. In transmit, to operate the fourth column
(ABCD),had the REV switch in and key the third column (3,
6, 9, 7).
3-7 SQUELCH
To eliminate receiver noise at the no-signal condition, slowly
adjust the squelch clockwise until the noise disappears and
the BUSY indicator goes off (threshold point).
The squelch will open, the BUSY indicator will light and the
speaker will operate when a signal is received.
The squelch control is also used for scan operation control.
If the signal is weak or fades during mobile operation,
readjust the squelch for consistent reception.

3-8 HI/LOW Switch
For local communication, it is recommended that power be
reduced to eliminate interference to other stations and to
minimize power consumption. By pressing the HIl/LOW
switch, transmit power is reduced from 40W to about 1 to
15W according to Freguency.
3-9 Meter
The LED level meter functions as an “S'”” meter during
reception. One LED ON equals O dBu, Five LEDs ON equal
20 dBu (+10, —2 dB). During low power transmission, 2
or 4 LED's will light, and 5 LED's will light during high power
transmission.
3-10 TONE Switch
This switch is provided to control a user supplied and instal-
led tone encoder. TRIO-KENWOOD does not manufacture
or supply this item.
To install, refer to Fig. 3-1.
3-11 Adjustment
* Low Power
The TR-7850 low power characteristic is shown in Fig.
3-2.
Low power may be adjusted by VR4, shown in Fig. 3-3.
* Deviation
On the RX unit X55-1270-10, VR3 adjusts mic deviation,
clockwise increases deviation.
On the control unit X53-1180-10, VR1 adjusts tone
deviation, clockwise reduces tone deviation.
OUTPUT POWER IN WATTS
US)
144 145 146 147 148 149
CARRIER FREQUENCY IN MHz
Fig. 3-2
3-12. Miscellaneous Information
LÊ
Frequency
step-up
at
power
switch
ON
or
OFF.
*
In
KEY
mode
operation,
the
frequency
may
step
by
one
step,
according
to
the
selected
channel
step.
*
In
memory
mode
operation,
the
channel
number
may
advance
by
one
channel.
These
are
normal,
and
not
a
mulfunction.
- Power consumtion at power switch OFF.
The
final
power
amplifier
in
this
high-power
tranceiver
is
fed
directly
from
the
power
source
without
passing
through
the
power
switch.
For
this
reason,
about
6
mA
of
leakage
current
is
consumed
by
the
final
section
when
the
power
switch
is
off.
Backup
current
at
about
2.5
mA
is
consumed
to
retain
memories.
If
backup
batteries
are
installed,
charge
current
at
about
15
mA
is
also
consumed.
J Remove 4 screws. TT
|
|
Solder the leads.

DO TERMINAL
VR3
PROTECTION VR4
LOW POWER
FINAL UNIT (X45-1180-10)
TC2
Es
So
VR1 PLL UNIT (X50-1650-10)
L24 L25 126
F.ADJ 133.3/0MHz
TP3
133.305MHz
OD 6 Ls RT
O
HET
ed BALANCE LT CONNECTOR
LR CONNECTOR
S. IND. vRi
TC1 10.6950MHz
VR3
DEVIATION
SkHz VR2
'
| MB SETTING
'
MB
ELA Ata) CONTROL UNIT (X53-1180-10)
ENCODER UNIT (X54-1500-10)
RX UNIT (X55-1270-10) | O
7% EA
VS
SS O, RR
Ev
e
eae
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na
»
Ns
S
RAS O SO SO SO SE PDR
XX ASS SS SO
||| XXX SS RSS CO SS
RSS
(> 9,
SS] vos 00.0. o!
CS
CX
SOS SOS
SS
696%
Fig. 3-3(A) Fig. 3-3(B)
00000-000000-000000- 000000 -000000- 000000 -000000 000000 -c00N0O-000000- 0000000 00000- 00000-000 = 000000 -000000-000000-0 00000-000 -000000 000000 -000000-000000-000000-000000- 00000-000 a OCO = 000000 -CO000D- 0000000 00000-000000- CONGO 000000 -CO0O0O- 000000 000000 - 0000004 0O0D-CONO0O=40ONDO-C00LDO-C00000- 000000 -4 00000 -000000-CO000O=00000Ar 0000-4005
SECTION 5. OPTIONAL ACCESSORIES
COOOD0O 0000000 00D00- 000000 -000000-00000-000000-000000- 000000 = 000000 = 000000 = 000000 -0 00000-004 000 = 000000 000000-C00000- 000000 - 000000 -000N0O- 000000 - 000000 =CON00O-000000-C00000-4 NONO = 00000 -400NDO-C0U0DO- 000000 -C00000- 000000 -C00D00- 00000-000 -COO00D-000000-000000-0000D- 00000 COND 00O0DD= 400000 = 000000 -C000DD-C000DO=000000-C00000=0000D0-000000-00000
VO0do-«BO0Do- «Bandas,
,
The following accessories are available for more 5-3 Charger BC-1
sophisticated operation of the TR-7850.
This charger is used as a Back-up power supply when the
5-1 Fixed Station DC Power Supply KPS-12 main power supply is off for extended periods.
The KPS-12 DC power supply perfectly matches the
TR-7850's design. It incorporates a circuit for protecting
the transceiver against shorted output and power supply
overload.
5-2 External Speaker SP-40
Designed for mobile operation. Styling and tone quality
match the TR-7850 perfectly.
14

0 000000000 000-000000-000000-6 000800 0000D< 000000 = 000000 -400000 400080 -0 00005 -4000DO=000080- 00000-000 00D< 000000 -C 00000 A0ONDO=0 0000 -00000OA0NNDO- 00000 = 000000 -4NU0DO-000000-0 0000-0000 -0U000O-4N00DO 000000 - 000000 -00D00D-00000D- 00000 -00000M000000-000000-40000D-000000-00D00D-a0NNTO= 00000 -AGD00M 400000 -000000-000000-400000-000000-000000-aN0
TR-7850
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Model TR-7850
Serial No.
Date of Purchase o e A
Dealer O mn Se ap E a ma
E E E
product of |
TRIO-KENWOOO CORPORATION
17-5, 2-chome, Shibuya, Shibuya-ku, Tokyo, 150, Japan
CRE SS SS
TRIO-KENWOOODO COMMUNICATIONS, ING.
1111, West Walnut Street, Compton, California, 9022
TRIO-KENWOOO COMMUNICATIONS, Gmbkh
D-6374 Steinbach TS. Industrestrasse BA, West Germany
TRIO-KENWOODO( AUSTRALIA)DPTY. LTO.
30 Whiting Street, Artarmon, Sydney NSW Australia 2064
O 15104 PRINTED IN JAPAN B50-3901-00 (K) (6)