Kenwood TK-701S User manual

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Synthesized
FM Two-Way Radio
32 Ch | Capability,
KENWOOD 20-50W 150-174 MHz.
TK-7O1S
SERVICE MANUAL

SERVICE MANUAL QUESTIONNAIRE
Your Name Dealer No
Company Name
Company Address
Zip
Today's Date
Service Manual Title
Printing Date (Bottom of Back cover)
USER FEEDBACK (Please print or write legibly)
As the user of this manual, we think you know what kind of information you need to service our equipment. We are
willing to listen to your suggestions if we can get them.
1. Is the Installation information good? __.ssdf not, what do you need?
2. Do you use the Circuit Description Section? __._ I it too difficult, too simple, or OK?
3. Do you use the suggested test procedures? Do you have test setups or test procedures that you
have found quicker or easier?
4. Do you use the suggested alignment procedure? —_______ If not, what procedure do you use?
5. Are the Parts Lists quick and.easy to use? If not, how would you like to see Parts Lists arranged?
6. What other information would you like to see?
7. General Comments
Fold, tape-seal and mail; postage will be paid by TRIO KENWOOD COMMUNICATIONS.
Please do not staple

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| | | | IF MAILED
IN THE
UNITED STATES
BUSINESS REPLY MAIL
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1111 WEST WALNUT STREET
COMPTON, CA 90220
ATTN: LM PUBLICATIONS

CONTENTS.
SPECIFICATIONS.
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1-1
GENERAL
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2-1
INTRODUCTION
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OPERATING
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PRE-INSTALLATION
CONSIDERATIONS
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FIELD
REALIGNMENT
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1.
DEALER
SALES
FLOW
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2.
SYSTEM
SET-UP
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3.
INSTALLATION
AND
CONVERSION
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4-1
3.
COMMON
PLL
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Channel
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replacement
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PARTS
LIST
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CIRCUIT
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LIST.
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TK-701
1. SPECIFICATIONS
(GENERAL)
aya
Yel
01-1
410,28
£1
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150
~
174
MHz
Number
of
Channels...
6
channel
on
basic
unit
16
semi-duplex
channels,
or
32
simpiex
channels,
adaptable.
Channel
Spacing
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kHz)
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GAA
0)
[0
1°
|:
Pepe
CEE
PET
ED
OOO
ODODE
OPESEOTSOTSESSSSESTOSEONOCEESECISTSSTESIOOSIOCSOTEOISOIOOIOTSCSEOIOOSS
13.8V
DC
negative
ground
Current
Drain
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1.0A on receive
10.0A on transmit
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Receiver
100%,
Transmitter
20%
Temperature
Range....ccccccccccccceceeectsesesceetecesenseeecssssecseseesscreeseencensecseseressessesesnecersensenecnay
-30°C
to
+60°C
(-22'F
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[email protected]
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|
1
So
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4.9
Ibs
(2.2
kg)
(RECEIVER)
(Measurements made per EIA standard RS-204-C)
RF
Input
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0.45uV
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distortion
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Channel
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Spread.
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MHz
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RF
Power
Output
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20
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Impedance...
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Modulation
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16F3,
+5
kHz
for
100%
at
1000
Hz
Direct FN Modulation
EM
NOiS@
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Microphone Impedance.........cceccccecsseecseseesesceeeerenecscsescevecsesseansetensnesesserssaseeserseasasasasnenesesaseenecseneneracaeaensneaias Lov inmpedance
Audio Distortion ...ccccccccccccccecseceescececassecssecesesassecsceseeteessecaceecescerevsensecsenetaeeaeesaseeseensenesnaespesiaaenenenes Less than 3% at 1000 Hz
Frequency Stability........ccccccsseeceeeeesreesreeneerteitiaieneeentrmensssnnees + 0,0005% from -3)°C to +60°C
Channel
Frequency
Spread....c..ccccccccccececvceceesseceeserseserecerscenscnessesecieneeesenessesecssesesseessseecsecsesectenenesietisirsncientnetineeaieene
7
MHz
1-1

2. GENERAL
INTRODUCTION
SCOPE OF THIS MANUAL
This manual is intended for use by experienced techni-
cians familiar with similar types of commercial grade com-
munications equipment. It contains all required service
information for the equipment and is current as of the pub-
lication date. Changes which may occur after publication
are covered by either Service Bulletins or Manual Revi-
sions. These are issued as required.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment infor-
mation, the full part identification number should be
included. This applies to all parts: components, kits, or
chassis. If the part number is not known, include the chas-
sis or kit number of which it is a part, and a sufficient de-
scription of the required component for proper identifica-
tion.
OPERATING INSTRUCTIONS
OFFS VOL
TK-701
PERSONNEL SAFETY
The
following
precautions
are
recommended
for
per-
sonnel
safety:
@ DO NOT transmit if someone is within two feet (0.6
meter) of the antenna.
@ DO NOT transmit until all RF connectors are verified
secure and any open connectors are properly ter-
minated.
@ SHUT OFF and DO NOT operate this equipment near
electrical blasting caps or in an explosive atmosphere.
@ All equipment should be properly grounded before
power-up for safe operation.
@ This equipment should be serviced by a qualified tech-
nician only.
Fig. 2-1 Operating Controls and Indicators
2-1

TK-701S
1. POWER-UP
To turn on the radio, rotate the OFF-VOLUME control
clockwise until a click is heard. The channel lamp indica-
tor will illuminate to indicate power is ON.
2. TO RECEIVE
Operation
Procedure
1. Disable QT
(if so equipped}
Remove microphone from its hanger.
2. Unsqueich radio
Turn SQUELCH control counterclock-
wise until noise is heard.
3. Set VOLUME control
Adjust VOLUME control for a normal
listening level.
4. Set SQUELCH control
Advance SQUELCH control clockwise
until noise just stops.
5. Select operating fre-
quency. (Multichannel
models only)
Rotate CH selector switch to desired
channel.
The radio will now receive all traffic on the selected channel.
6. Enable QT
(if so equipped)
Insert microphone back into its hanger to
activate KQT-1 or -2.
You will now hear messages for your system only.
3. TO TRANSMIT
Operation
Procedure
1. Disable QT
(if so equipped)
Depress MONITOR button ON.
.- Ore
Remove microphone from hanger.
2. Select operating fre-
quency.
(Multichannel models
onty)
3. LISTEN
DO NOT TRANSMIT if channel is in use.
4. Key transmitter Press and hold the microphone PTT
switch. The Red LED on the front panel
will glow indicating the transmitter is
ON.
5. Transmit message
Hold microphone at about 2 inches dis-
tance and speak at a normal voice level.
Keep transmissions brief.
6. Receive reply
Release the microphone PTT switch.
7. Enable QT at end of
the conversation.
(if QT equipped)
Depress MONITOR to the out position.
and
Replace the microphone into its hanger.
PRE-INSTALLATION CONSIDERATIONS
1. UNPACKING
Unpack the radio from its shipping container and
check for accessory items. If any item is missing, please
contact TRIO-KENWOOD immediately.
2. LICENSING REQUIREMENTS
Federal regulations require a station license for each
radio installation (mobile or base} be obtained by the
equipment owner. The licensee is responsible for ensuring
transmitter power, frequency, and deviation are within the
limits permitted by the station license.
Transmitter adjustments may be performed only by a
licensed technician holding an FCC first, second or general
class commercial radiotelephone operator's license. There
is No license required to install or operate the radio.
3. PREINSTALLATION CHECKOUT
3-1. Introduction
Each radio is adjusted and tested before shipment.
However, it is recommended that receiver and transmitter
operation be checked for proper operation before installa-
tion.
3-2. Testing
The radio should be tested complete with all cabling
and accessories as they will be connected in the final
installation. Transmitter frequency, deviation, and power
output should be checked, as should receiver sensitivity,
squelch operation, and audio output. QT equipment opera-
tion should be verified.
4. PLANNING THE INSTALLATION
4-1. General
Inspect the vehicle and determine how and where the
radio antenna and accessories will be mounted.
Plan cable runs for protection against pinching or
crushing wiring, and radio installation to prevent overheat-
ing.
4-2. Antenna
The favored location for an antenna is in thecenter
of a large, flat conductive area, usually at the roof tenter.
The trunk lid may also provide a good antenna locaion. If
the trunk lid is prefered, bond the trunk lid and vehicle
chassis using ground straps to ensure the lid is at thaassis
ground. ;

4-3. Radio
The universal mount bracket allows the radio to be
mounted in a variety of ways. Be sure the mounting sur-
face is adequate to support the radio’s weight. Allow suffi-
cient space around the radio for air cooling. Position the
radio close enough to the vehicle operator to permit easy
access to the controls when driving.
4-4, DC Power and wiring
1. This radio may be installed in negative ground electrical
systems only. Reverse polarity will cause the cable fuse
to blow. Check the vehicle ground polarity before in-
stallation to prevent wasted time and effort.
2. Connect the positive power lead directly to the vehi-
cle battery positive terminal. Connecting the Positive
lead to any other positive voltage source in the vehicle
is not recommended.
CAUTION:
If DC power is to be controlled by the vehicle ignition
switch, a switching relay should be used to switch the posi-
tive power lead. The vehicle ignition switch then controls
DC to the relay coil.
3. Connect the ground lead directly to the battery negative
terminal.
4. The cable provided with the radio is sufficient to handle
the maximum radio current demand. If the cable must
be extended, be sure the additional wire is sufficient for
the current to be carried and length of the added lead.
5. INSTALLATION PLANNING - CONTROL STATIONS
5-1, Antenna system
Control station. The antenna system selection de-
pends on many factors and is beyond the scope of this
manual. Your KENWOOD dealer can help you select an
antenna system that will best serve your particular needs.
5-2. Radio location
Select a convenient location for your control station
radio which is as close as practical to the antenna cabie
entry point. Secondly, a source of 117 volt, 60 Hz power
must be available. Make sure sufficient air can flow
around the radio and power supply to allow adequate cool-
ing.
2-3
TK-701
SERVICE
This radio is designed for easy servicing. Refer to the
schematic diagrams, printed circuit board views, and
alignment procedures contained in this manual.

3. FIELD REALIGNMENT
1. DEALER SALES FLOW CHART
Merchandise
received.
!
! License and frequency
TK-701
allocated by FCC.
Choose transceiver
classification by
frequency (K, K2, K3 or K4) K: USA MARKET
1 (M, M2, M3 or M4) M: OTHERS
Determination of
channel numbers Frequency range Type
to be used. 150 ~ 160 MHz TK-701S K,M
156 ~ 163 MHz TK-701S K2, M2
{ 162 ~ 169 MHz TK-701S K3, M3
With or without .
signalling, CTCSS, 168 ~ 174 MHz TK-701S K4, M4
etc.
Two PROM ICs installation Fre-
quency data input by PROM.
(Refer to KPT-10 section.)
J
With or without KTT-1
Time-out Timer.
|
Check out and possible
realignment using actual
operating frequency.
Delivery
(Instailation)
3-1

Basic MODEL
Frequency 6 CH
allocation. Duplex.
v
See 3.1
Frequency
PROM writer.
J
Need 32
channels?
NO
Need 16
RCC NO
used?
YES
See 3.2
Semiduplex
conversion.
A
See 3.13 RCC Other than CTCSS
conversion.
No signalling. — Which
signalling system
is
used?
See
3.4
J
Signalling other
than KOQT-1 or -2
| Other than CTCSS. Which signalling No signalling.
J
system
is
used?
ij
See 3.9
Time-out timer YES (KTT-1) Conversion to
used? 32 channels.
q
See 3.11 CTCSS with NO (KQT-2)
Time-out timer ROW?
NO installation.
<
YES
(KQT-1)
v y
See 3.12 See 3.4
Realignment using Signalling other See 3.6 CTCSS ROM $99 381 oTCSS unit
operating
frequency.
than
KOT-1
or
-2
installation.
installation.
J {
J
See
3.9
;
See
3.10
.
See
3.9
;
Conversion
to
Conversion
to
Conversion
to
Delivery 32 channels. 32 channels. 32 channels.
(Installation)
L
L
See 3.4
See 3.7
channels?
YES
Need
NO
duplex?
See 3.2
Duplex
conversion.
Other than CTCSS. Kwe> No signalling.
v
Signalling other
than KQT-1 or -2
{
Conversion to
16 channels.
—
system is used?
See 3.8 ;
Conversio
16 channe
CTCSS
with
NO
(KQT-2)
PROM?
YES (KQT-1)
q
See 3.5 See 1.6 :
CTCSS ROM CTCSS unit
installation. installation.
' ,
See 3.8 See |.7
Conversion to Conversipn to
16 channels. 16 channels.

Koa\
v
system is used?
CTCSS with
ROW?
YES
Which signalling
No signalling.
(KQT-1}
CTCSS ROM
installation.
Conversion to
32 channels.
See 3.9
Conversion to
32 channels.
NO (KQT-2)
j
See 3.6
CTCSS unit
installation.
q
See 3.9 ;
Conversion to
32 channels.
L
See 3.4
See 3.7
NO
channels?
YES
Need
NO
duplex?
See 3.2
Duplex
conversion.
j
v
Other than CTCSS. Knw> No signalling.
Signalling other
than KQT-1 or -2
v
Conversion to
16 channels.
L
system is used?
See 3.8 ;
Conversion to
16 channels
CTCSS with NO (KQT-2)
PROM?
YES (KQT-1)
See 3.5 See 3.6
CTCSS ROM CTCSS unit
installation. installation.
1 i
See 3.8 ; See 3.7
Conversion to Conversion to
16 channels. 16 channels.
LL
See 3.3
Need
simplex?
Simplex
conversion.
t
Other than CTCSS: Kom
J
See 3.4
Signalling other
than KQT-1 or -2
_ See 3.5
TK-701S —
2. SYSTEM SET-UP
No signalling.
system is used?
CTCSS with
PROM?
YES (KQT-1)
CTCSS ROM writer
installation.
NO (KQT-2)
y
See 3.6
CTCSS unit
installation.

TK-701S
3. INSTALLATION AND CONVERSION
1:
Writing a frequency into PROM (Fig. 3-1)
Input an allocated frequency with the PROM writer.
5: Installing KOT-1 (Fig. 3-2, 3)
Connect plug P32 (E31-2181-05) to J32 on the
For simplex, duplex, etc. input, refer to the PROM
writer instructions.
2: To modify a 16CH transceiver for duplex, install JU14
on the PLL unit.
3: To modify a 6CH transceiver for simplex, open JU12
on the PLL unit.
4: Installing Signalling other than KOT-1, -2.
Refer to the manual supplied with the Signalling de-
vice.
————
—
=|
Lod
\
l
I
1
q
a ——
———
an
yl
Fig. 3-1
BOTTOM VIEW
3-3
CTCSS unit and that of E31-2181-05 supplied to PLL
unit JQ.
To install a CTCSS unit, remove the screws in the
CTCSS mounting holes, secure the supplied hex
bosses in their holes, remove P6 from PLL unit J6 and
install the CTCSS plug in J6. Secure the CTCSS unit
to the hex bosses with two machine screws.
oo.
b
Canon O
o) — Sea
Who ud * fo =
-
(itty
nf | PLL unit 5
no 3%
ia O 0° ©) °
=< — rk
BOTTOM VIEW
Fig. 3-2
KQT-1 CTCSS
EST= 2181-08
6CH ONLY
PLL unit
L. © O =
O =
|
° 06 Jo
0 gO ¢ ial
_——— — w,
BOTTOM VIEW
Fig. 3-3
6: Installing KOQT-2 (Fig. 3-5)
For installation on the PLL unit, proceed as in item 5.
In this case, the cable assembly with plug is not sup-
plied with the CTCSS unit.
PLP
Ole
n
——)
J6
|
-—
Jf)
|P
omme
=
O
fo w * RE
tr PLL unit
mf] O .
BB
BOTTOM VIEW
Fig. 3-4
wep ll
oO
|
ie)
se
. unit Of}
TT J E
[
O
PLL unit
O =
O —
|
O 0 oO ‘o)
O gO ¢ al
BOTTOM VIEW
Fig. 3-5
7: Conversion to 16CH with KOQT-2 or without CTCSS
Disengage the front panel, remove the 6CH rotary
switch S$01-1433-05 secured to the chassis, then
10:
disconnect the rotary switch plug connected to
PLL unit J7. Install the new rotary” switch
$29-1432-05 and cable E31-2176-05 to the 16CH
revision kit PC board. Secure the rotary switch to
the chassis and connect the cable plug P9 to PLL
unit J9. Cut off the brown and red wires from the
plug, since these two wires are not used.
: Conversion to 16CH with KQT-1
The only difference from item 7 is that cable plug P9
is now connected to CTCSS unit J31.
Cable: E31-2182-05
: Conversion to 32CH without signalling or CTCSS
Basically the same as in item 7. Use the 32CH revi-
sion kit in lieu of the 16CH kit and connect the brown
and the red leads (cut in item 7) to the S2 AUX switch
on the TX-RX unit, as shown.
TX-RX unit
MON AUX
Ore ©
Lor |? hh Red
i) hy
0 1 &) fo a
a a
« a
a
ze
be —,
we J
Brown
IT
Fig. 3-6
11:
12:
13:
tt
(1
{E
(2

6: Installing KOT-2 (Fig. 3-5)
For installation on the PLL unit, proceed as in item 5.
In this case, the cable assembly with plug is not sup-
plied with the CTCSS unit.
©)
Fig. 3-4
KQT-2
QL
LL
“Tp 79 RA
J6 4 || /-—=
© coo eee Wks
D ome) ; =
5 / 3
g |
|
he O-— OWE
PLL unit !
©) =
Oo
|
O05 5/°
O q O
BOTTOM VIEW
Fig. 3-5
3-4
7:
Conversion
to
16CH
with
KOT-2
or
without
CTCSS
Disengage
the
front
panel,
remove
the
6CH
rotary
switch
SO1-1433-05
secured
to
the
chassis,
then
disconnect
the
rotary
switch
plug
connected
to
PLL
unit
J7.
Install
the
mew
rotary
switch
$29-1432-05
and
cable
E31-2176-05
to
the
16CH
revision
kit
PC
board.
Secure
the
rotary
switch
to
the
chassis
and
connect
the
cable
plug
P9
to
PLL
unit
J9.
Cut
off
the
brown
and
red
wires
from
the
plug,
since
these
two
wires
are
not
used.
: Conversion to 16CH with KOT-1
The only difference from item 7 is that cable plug P9
is now connected to CTCSS unit J31.
Cable: E31-2182-05
: Conversion to 32CH without signalling or CTCSS
Basically the same as in item 7. Use the 32CH revi-
sion kit in lieu of the 16CH kit and connect the brown
and the red leads (cut in item 7) to the $2 AUX switch
on the TX-RX unit, as shown.
TX-RX unit
MON AUX
(a) ®
©
0 0 0 fH Red
0 JU! a ie "
Brown
Fig. 3-6
10:
11:
12:
13:
Conversion to 32CH with KQT-1
Connecting the cable plug P9 to CTCSS unit J31 is
the only difference from item 9.
Installing time-out timer KTT-1. (Fig. 3-7)
Install the Time-out timer in place on the PLL unit as
shown. Connect Time-out timer plug P45 to PLL unit
J5, then open PLL unit JU3.
8 Time-out timer
N)
ame) | a
\ i
|
Cc Hl
or O J!
ol((F
PLL unit :
(@)
a |
——
S06 oO
00 % FIN
BOTTOM VIEW
Fig. 3-7
Perform operating frequency realignment, following
the alignment procedure, page 5-7.
For RCC
(1) obtain kit;
KCH-1C (RCC kit for TK-801S)
KCH-1D (RCC kit for TK-701S)
(2) Cut off the red lead @ from the 16 channel
switch.
Cut off the brown lead © from the 16 channel
switch.
(3)
(4)
(5)
Install the rotary switch to the chassis.
Pass the brown lead ©, cut in item (2), under the
VOL and SQL bracket and solder it to panel side
of AUX switch.
Solder the brown lead @ to the common side.
Install the channel knob.
Install PLL unit (X50-1970-21) JU14.
@RED
3-5
(6) Replace the escutcheon panel with the RCC
panel.
TK-801S: A21-0758-04
TK-701S: A21-0759-04
Attach the escutcheon panel with double-faced
adhesive tape.
:
PLL unit
Loin
ér
O
©
|
O
O
@BRN og
© BRN
E31-2176-05
BOTTOM VIEW
Fig. 3-8
@ BRN
MON
AUX
a)
x x
oO DOD ‘@)
0 tt) 0
0.0 CO D
©
© BRN ~
£31-2176-05
~
@
|
To
PLL-J9
Fig. 3-9
(7) Operation
ROM (out position):
Pre-programmed frequencies change by the 16
channel switch.
HOME (in position):
Pre-programmed HOME frequency pair is auto-
matically selected at “H”.

4. CIRCUIT DESCRIPTION
1. TX (Transmitter)
The VHF signal fed from the PLL unit is apmlified at
each stage from Q1 (2SC2570A) through 04 (28C2630)
and is fed to the triple seciton Low Pass Filter (LPF). More
or less than 50W is then obtained at the antenna terminal.
For harmonics, both 2nd f and 3rd f provide better
than—70 dB.
8~|10dBm
TK-701:
The signal detected at the 04 (2SC2630) output var-
ies the applied voltage of Q3 (2SC2539) and Q2
(2SC2538). This controls the antenna output from 20W
to 50W. This APC circuit is similar to that of the TK-801.
If the final transistor temperature rises abnormally, the
temperature protection activates to reduce the thermistor
TH 1 resistance. This reduces the standard voltage of the
APC circuit and that of the Q6 (2SB946) to reduce the out-
put power.
LPF
-idB
Fig. 4-1 Transmitter Block Diagram
2. RX (Receiver)
Receiver input supplied through the antenna terminal
passes through the low pass filter and antenna switching
circuit, and is initially VHF-filtered by BPF assembly (L20,
21). The filtered signal is RF amplified by Q10:
2SK241(GR)-1 and is further filtered by BPF L23 and L24.
This is then input to the 1st mixer Q11: 2SK125-4. The
1st oscillator injection signal is supplied from the PLL unit
to the RXO input. This is multiplied by , filtered by BPF:
L18,L19, and coupled to the 1st mixer O11: 2SK125-4.
4-1
The ist IF signal frequency (21.4 MHz) cutput from
the 1st mixer is filtered by Monolithic Crystal filter (MCF)
Z27 and Z28: 21F15B, and is post-amplified by Q12:
2SK241(GR)-1. This is coupled to U13: MC3359P which
contains the 2nd local oscillator, mixer, 2nd IF amp, qua-
drature detector, noise amp and squelch switch
The 2nd local osc operates at 20.945 MHzto convert
the 1st IF from 21.4 MHz to the 2nd IF at 45§k Hz. This
2nd IF signal is filtered by ceramic filter 231: C'W455D, is
limiter amplified, and is then quadrature detected.

TK-701S
The detected audio frequency signal output from U13
is amplitude-limited by diode limiters D13 and D14: both
131555, and amplified by Q15: 2SC1815(Y), then
coupled through the PLL unit for optional tone signalling
use. The audio signal returned from the PLL unit is de-
emphasized by R62 and C135, and is actively high-pass
filtered
by
Q21:
2SC1815(Y).
This
is
fed
to
the
volume
control
on
the
PLL
unit.
Again
returned
from
the
PLL
unit,
the
signal
is
ampli-
fied
by
audio
PA
U17:
uPC1242H,
and
then
fed
to
both
the
built-in
speaker
and
the
external
speaker
terminals.
Bt
? 20.945MHz
1 | . 18 0.0047
Ot
ag
O
2
.
¢
“nour
33P 2 Le
120P
2
3
=
17
fo) 2) a
Ceramic
3
©
16
~
Filter OTt 2 2 O— Mute
CFV 1.8K @
4550 4 8 ° 15
—O ® Scan Control
8
5
1-4
O'4
squeich
input
35 Limiter
Ol 6 = 53
‘ L L Sek Inverting Op Amp
O.l
7
50K
~~
12
(Filter)
[ IOP:
8k * aff 1
“ ll ie Demodulator ry O
a 9 10 _
re -O-— Recovered Audio
ISP tT
Fig. 4-2 Functional Block Diagram of U13 (MC3359P)
ANT Antennd
Oo-—— sw. ~| @PF BPF
-
120dBm
-0.5d8
-0.7dB
+10dB
-2dB
+
76B
-2dB
MCF UI3
21F 15B MC3359P BPF
L 3 5! 10
-6dB
Ceramic
yidg filter
20.94 5MHz Z3)
il O+10dBn
RXO
PLL
unit
PLL
unit
SP
O O O © ©
DIZ.
AFI
AFO
AVO
4w4n.
ad ci35
0.64V I olev abmy
Fig. 4-3 Receiver Block Diagram
4-2

Squelch circuit
There are four inputs which activate the squelch gate:
noise squelch, signalling squelch, muting and monitor.
Noise squelch is supplied from the audio output of
U13: MC3359P to noise amp Q14: 2SC1815(Y) and
- then to the squelch control located on the PLL unit.
Noise from the squelch control is returned to the noise
amplifier section of U13: MC3359P pin 12.
Output from pin 13, it is then rectified and used to control
U13 pin 14. Pin 16, mute output is fed to squelch switch
Q24: 28C1815(BL).
TK-701
Signalling squelch from the PLL unit via the AC ter-
minal is achieved along with microphone hanger switch
logic by U200: TC4001BP, and is then supplied to
squelch switch Q24: 2SC1815(BL). Muting is directly
connected to squelch switch 024: 2SC1815(BL). These
three inputs are all squelched at logic low: that is, no
sound is output.
Muting is performed by squelch switch Q24:
2SC1815(BL) and is fed to squelch gate Q22 and Q23:
both 2SC1815(BL). The monitor is also coupled to the
inputs of Q22 and Q23. When the monitor is opened,
squelch is switched on.
Fig. 4-4 TC4001BP
Voo
U200 14( [3] 12) 11; 10; 9) 8|
TC4001BP En CE
t] 21 3] 4] 51 6. 7|
Vss
PLL unit
UI3
MC3359P NSO
I6 14 13
Dil
D202
To LED
drive
cilcuit
Fig. 4-5 Squelch Circuit
The priority order of each input over the squelch is
listed in the following table.
The input Jevel for squelch operation is listed in the
following table.
JU1 closed JU1 opened , an “H” Jevel
input L” ievel ened
Priority
input
Priority
input
ir
of
1 Monitor 1 Noise squelch Monitor Sound output No suncd
(Squelch OFF) (Squich ON)
2 Noise Ich 2 Monit
se squelc onutor Noise squeich No sound Sou d ocstput
2 Signalling squelch 3 Signalling squelch {Cathode of D18) (Squelch ON) (Squich OFF)
2 Muting 3 Muting Signailing squelch No sound Soud ovstput
(Cathode of D202) (Squelch ON) (Squich OFF)
Muting No sound Sou d octput
(MUT terminal) (Squelch ON) (Squich OFF)
4-3

TK-701S
The relationship between AC, QTD and signalling Power supply
squelch
output
is:
The
power
supply
section
consists
of
RX/TX
switch
U16: MB3756, 018 channel indicator lamp regulator,
QTD AC Signalling squelch (D202 Cathode) 9.4V and 019 “COM” line regulator, 7.5V in receive both
4 4 L 2S8C1815(BL).
U16: MB3756 alternately switches R8 and T8 by
H
L
H
grounding
the
key
line,
and
supplies
C8
(common,
or
L 4 H always ON) output, all at 8V.
L
L
H
VIN -— UI6 [°° voo_C8
; MB 3756 é ——° vor RB
5 _8
Status indicators
LEDs; TX and BUSY, and an optional CALL LED. The TX
LED is red and lights only when transmitting. The BUSY
LED lights green while the noise squelch is opened. The
CALL LED flashes yellow while the tone squelch is opened.
j T Voz TB
There are two supplied and one optional indicator a of L778 a =:
Fig. 4-6 Operational Diagram of U16: MB3756
UI3
Le,
Q19
[
(S)
LAMP
1901
Q20
326
(
_ul6
|
D901
C8
T8
$y
$f}
$$
—__——¢
BUSY
BG55I4S
xy
Key
Ww—f>t
“S40
2993!
caLL
PY55345
(OPTION)
WA
we
D902
Q201
fos
TX
PR5534S
to
U200
Fig. 4-7 Power Supply and LED Circuit
4-4

3. Common PLL
The VCO output from Q1: 2SK125 is buffered by Q2
and Q3: 2SC2668(Y), is switched by diode D2: 1S2588,
and is then sent to the RX unit as the RXO signal (receiver
1st local osc.). A sample of this signal is coupled to pre-
scaler U21: uwPC571C from the output of Q2 through
buffer Q5: 2SC2668(Y).
The prescaler acts as a 1/64 or 1/65 divider con-
trolled by the pulse generated by PLL IC U18 pin 9
(MC145152) and its output is further divided by the ~ N-
counter U18: then it is coupled to the phase comparator.
The output of the reference oscillator Z1: TCXO is
divided by U18 after buffering by Q6 and is coupled to the
phase comparator. The dividing ratio is determined by
16-bit parallel data set by PROM ICs U22 and U23:
M54730AP. The dividing ratio of the reference oscillator
output is locked. The output of the phase comparator is
fed through the charge pump U20: TC4007UBP and the
loop filter and is then coupled back to varicap diode D1:
1 SV50E as the VCO control voltage.
RXO frequency range: fi (MHz)
F1
F2
F3
F4
f. formula:
fL (MHz)
128.6000 ~ 138.6000
134.6000 ~ 141.6000
140.6000 ~ 147.6000
146.6000 ~ 152.6000
If the TX frequency is fT’
fp=fr-21.4
N value range (f;: PLL TXO output):
N=25720 ~ 30520
formula:
N=8- 214 1000
TXO(+lOdBm) RXO(+8dBm)
TX
PLL
loop
83.59
KHz
comparison
ft
fL
Common
PLL
loop
aneeeieheteeientaaiennetats
|
1
!
re)
Q10,Q1
|
D2
Q2,03
Ql
—___
'
DIODE
,
_
ee
ee
L.P.F
Fe)
vco
[|
gurrer SwitcH
|
|
|
BUFFER
vco
——.
4
Qs
L
Ql2
{
{
Ql
Q
6
REF
||
4
MIXER
be
R
L.P.F
2c
Ret
+]
256
|
BUFFER
BUFFER
BUFFE
eee
bea
a
“
MCI45151LP
tL
Q4
ve}
Q20
214
MHz
65,
|
Charge
BUFFER
pump
SIG
O
ie
Sees
Se
|
P.D
U24
U24
Ue
ues
=>
nN
Mic
O—4
+648
LIMITER
“oe
L.P.F
po
ore
°
L-___
}
Oct
Oct
Oct
°
ul8
7
a
MCI45152P
'
&
1}
2048
~
L--}--!
|
a6
U22
U23
BUFFER
PROM
MI
M2
7
4
S 4
p
z!
TCXO
a8
Diode
matrix
Shift circuit
for
6CH
Fig. 4-8 PLL Block Diagram
4-5
Address bus for I6CH/32CH
TK-701
SKHz
comparison
0. 24 MHz

TK-701S°
;
RA2
O—=16
12x
3
ROM
Reference
RA
|
O—415
OSCout
26
RAO
4
Decoder
as
Lock
28
oscino=
+2
12-Bit=R
Counter
Detector
r——OLD
9
Modulus
Voo
a
——©
Control
out
Vss
Of
=
8
Control
—“t
Phase
ov
AN
Logic
Detector
|
7ogR
FinoL
4
$f
0
6-8it
+A
Counter
10-Bit+N
Counter
=
eRe
al
Eee
TTT
A3
A2
AO
N4 N5
N7
Fig.
4-9
MC145152
(PLL
unit
U18)
_—
*
0
4
A3
A2
At
Ao
Os
fe
;
;
2
in|
ize]
9
AaG
fie]
[15]
[ia]
fia]
fi
|
aB3@
1/32
&
[
|
JT
yy
Address
Sa2(—necoder|
|!
ROM
Chip
|
Address
decoder
|
input
da
4
enable
| |
|
i
|
A0(0—
3
Memory
cell
Chip
enable
©—p—
[
aia
input
[
E
a
[3
7
rs
|
E
Is
|
[7
|
|
8
|
bal
* *
bad
*
*
ie
*
om
o3s*
o4%
os*
o6*
oO7*
GND
9
%*
Open
collector
01
O02
03
04 O5
Os
OF
O8
output
—
v
4
Data
output
Fig.
4-10
M54730AP
(PLL
unit
U22,
23)
Voo l0p 2Sp 2Dp 3Sp
14 13 2 | VI
Se ‘~ 4
6 l2
N 3 OUT
goood
8 5
Ves ION 2in 28n 2DN SiN aon
Fig.
4-11
TC4007UBP
(PLL
unit
U20)