Kenwood TS 660 Service Manual

Page 1

©KENWDODR 00333
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Madel I 5-660
VOX-4 SP-IZIJ PS-20 MB-IOO
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, ALL MODE QUAD BANDEB
I
I. ,
.:. r CONTENTS
I SPECIFICATIONS ......................... 2 DISPLAY UNIT (X54~1630-OO) ............. 18
CIRCUIT DESCRIPTION .................... 2 PARTS LIST ............................ 19
OUTSIDE VIEWS .......................... 8 DISASSEMBLY .......................... 27
I PC BOARDS/CIRCUIT DIAGRAMS LEVEL DIAGRAM ........................ 29
SWITCH UNIT BAND SWITCH UNIT IX41-1350~00) ........ 9,15 BLOCK DIAGRAM ...................... 42
ENCODER UNIT IX541640-OO) ........... 9,15 VOX-4 ................................ 43
RF UNIT IX44-I440'00) .................. IO TERMINAL FUNCTIONS ................... 47
FM UNIT (X484340-OOI ----------------- 11 PACKING .............................. 49
IF UNIT IX48-1330700I ................ 12.13 SCHEMATIC DIAGRAM .................... 50
CONTROL UNIT IX53-1220700) .......... 14,15 PS-20 ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 51
PLL UNIT (X507174O-OO) ................. 16 SP~120 ........................ BACK COVER
/ FILTER UNIT (XE-126000) .............. I7 MB-IOO ....................... BACK COVER
FINAL UNIT (X56-I4IO-OOI ............... 17

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SPECIFICATIONS/CIRCUIT DESCRIPTION

[GENERAL]

Frequency Range:

Mode:

Frequency Stability: (At room temperature)

Antenna lmpedance:
Power Requirements:

Semiconductor Complement:

Dimensions (profections excluded):
Weight:

[TRANSMITTER SECTION]
RF Output Power:

Carrier Suppression:
Sidebsnd Suppression:
Spurious Radiation:

Maximum Frequency Deviation (FM):
Microphone Impedance:

15 meter band 21,0000~ 21.4500 MHZ

12 meter band 24.5000\ 24.9999 MHZ (Receive only)

10 meter band 28.0000~ 29.7000 MHZ

6 meter band 50.0000~ 53.9000 MHz

FM (F3), SSE (Aaj), CW (All, AM (A3)

Within 1 200 Hz during the first hour after 1 minute of warmup
Within 1 30 Hz during any 30 minutes after warmup

50 I?

12~ 16 VDC (13.8 VDC nominali

Transmit (max) 4 A (SWR: Less than l.5l

Receive 1 A
ICs 35
FETs 22
Transistors 156
Diodes 2 1 7

Display tube 1
241 (971/2)Wx94i3-11/161Hx236 (9-5/16")D mm
4.9 kg (10.8 lbs)

553, CW, FM 10 W
AM 4 W
Better than 40 dB
Better than 50 dB

21 > 28 MHz band Better than 40 dB
50 MHz band Better than 60 dB
a: 5 kHz

500 Il~ 50 kfl

Audio Frequency Response:

[RECEIVER SECTION]

Squeloh Sensitivity (FM):
Audio Output: 1.5 W

government amateur authorization,

RECEIVER CIRCUIT

There are two antenna terminals on the TS-660 : one for
BOMHZ ANT 1 and one for 21-28MH2 ANT2. The
50 MHZ antenna terminal can be switched to operate
the full 21-50MHZ range by means of a rearpanel
changeover switch 82. When ANT 1 is used for All»BAND
operation, ANT 2 is automatically grounded,

The receiver system is single conversion with an IF of
8.830kHz_ The FM is dual conversion with a 2nd lF of
455kHz.

Audio Output Impedance: 8 ~ 16 $2

400~2600 Hz (-6 dB)

0.25 iv for 10 dB SW
1 ,tv (or 10 as S/N

1 [1V (or 30 dB SW

0.4 uv for 12 dB SINAD

Better than 60 dB
Better than 70 dB
SSE, CW, AM 2.4 kHz (-5 dB), 4.2 kHz (-60 dB}

15 kHz (76 dB), 32 kHz (760 dB)

VK-BSA 6 kHz ( <6 dBl, 11 kHz (760 dB)
YK788C 500 Hz (~6 dBl, 1.5 kHz (~60 dBi
VKVBBCN 270 Hz ( 76 dEli, 1.1 kHz (760 dB)

Sensitivity: 883, CW
AM
FM
Image Ratio:
IF Rejection:
Selectivity:
FM
Optional Filter
AM filter
CW filter

0.32 («V (at threshold)

Note: Circuit and ratings may change wlthout notlce due to developments in technology.

" Will transmit on the new 12 meter band. A lead wired for preventing accidental transmission before

At the RF stage, the 50 MHz and 21-28 MHz inputs are in-
dependent, but become common from the mixer stage. The
50 MHz antenna signal enters through the transmission LPF
(Filter unit, L7~9l and then to the VHF antenna coils.
For HF bands (21728 MHz), the signal enters the RF unit
HF antenna coils directly. Changeover between these trans-
mission and reception antenna paths is accomplished by
diode switches, However, relays are used for band change-
over, Input signals are stepped up by the RF unit antenna
coils; VHF L3, 4 and HF antenna coils (L941) and RF
amplified by VHF C21 SSK73, 0r HF 05 : 33K73.

\

Page 17

Pc BOARD VIEWS TS-660

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V FINAL UNIT (X56-1410-00)

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D6,7,10,11:M|402 D12 : V068 D8: MISOI

< Disconnecting the coaxial cab|e >

Coaxial cable
< Attachment direction of 01,2 >

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~74
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Longrnosed pl Iers

Hold the crimped metal sleeve with
Pliers and pull up as shown.

Components side view Caution ' DO NOT pull on the cable,

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