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World of Ham Radio 1997
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1997-02-01
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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 # 996
MODEL: TM-732A
SUBJECT: 2Meter Transmit Interference on 70 CM
Reports of 70 cm receiver interference might occur when transmission is
attempted on two meters. This is caused by a harmonic relationship that
occurs between some 2 meter frequencies and the IF image frequency.
The resulting signal enters IC20 1 (FM HIC) on the 8R line of the 430 MHz
TX/RX Unit.
Addition of a chip bead and bypass capacitor on the 8R line will correct
this tendency.
Parts Required:
470 pF chip capacitor CK73FBlH471K
Chip bead L92-0131-05
Note: Don't confuse the chip capacitor with the chip bead. They have the
same shape. The chip bead is black and the chip capacitor is brown so it
should be a simple matter to identify the correct part.
Cut the trace on the 430 TX-RX Unit (X57-4000-XX) thats goes from R219 to
R223 (8R Line) and add the chip bead across the cut trace. Then add the chip
capacitor from the 8R line to the adjacent ground trace. Put the capacitor
next to R219.
Time required for this modification is 30 minutes.