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World of Ham Radio 1997
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==============================================================================
K E N W O O D
>>> A M A T E U R R A D I O S E R V I C E B U L L E T I N <<<
==============================================================================
Kenwood Service Centers
Kenwood Service Corporation Kenwood Service Center, East
2201 East Dominguez Street 829 Lynnhaven Parkway, Suite 130
Long Beach, California 90801 Virginia Beach, Virginia 23452
Telephone 1-310-639-5300 Telephone 1-804-340-1702
==============================================================================
BULLETIN # 44
MODEL: TS-120S/TS-180S
SUBJECT: PHONE PATCH TERMINAL ADDITION
Kenwood recommends the PC-1 Phone Patch for all of our radios.
Most other phone patches will work satisfactorily without any
modification to the radio, requiring only an external speaker
connection, and that the Mic line be run through the Patch.
For those operators who desire a Patch input similar to the
TS-520S or TS-820S, an input connection and terminal must be
added at the Mic input preamp circuit.
Fixed Divider
Use a 100K in series, with a 10K ohm to ground on the input side
of the 100K resistor. Use shielded line, and connect as follows:
100 K
IN------------100 K ------>
GND |
|
100 K
|
|
GND
TS-120S
On the IF Gen unit X49-1110-01 install the fixed divider at the
junction of R43 10K, C42 100pf, &C43 luF (input of Q18). Add
an RCA jack, or use remote pins 7 and Gnd for input.
TS-180S
On the IF unit X48-1240-00 install the fixed divider at the
junction of R167 10K, C128 .001uf & C129 luf (input of Q32).
Add an RCA jack at the predrilled hole on the rear panel for input.