home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
World of Ham Radio 1997
/
WOHR97_AmSoft_(1997-02-01).iso
/
mods
/
kenwood
/
asb_text
/
asb0945.txt
< prev
next >
Wrap
Text File
|
1997-02-01
|
2KB
|
41 lines
==============================================================================
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 # 945
MODEL: TH-205
SUBJECT: SIGNAL-TO-NOISE RATIO IMPROVEMENT
During strong signal reception, the noise level may appear to increase
due to unstable action of the active filter in the PLL. To improve the
signal-to-noise ratio, install a 390K ohm resistor on the emitter of Q12
(active filter) as described below.
REQUIRED PART:
390K OHM CHIP RESISTOR PART # RK73FB2A394J
1. Disconnect the battery and antenna.
2. Remove the 7 screws from the back panel of the transceiver
3. Lift the front panel from the transceiver and lay it to the right side.
4. Disconnect the 2 flex cables and remove the 3 screws from the IF unit
5. Pull the top panel off and then remove the IF unit.
6. Remove the 8 screws from the RF unit and unplug connector CN2
Remove the RF unit from the back cover.
7. Locate capacitor C82 on the foil side of the RF unit
8. Solder the 390K ohm chip resistor directly on top of C82.
9. Assemble the transceiver by reversing steps 1 - 6.
Time required for this modification is 1.0 hrs or less.