Modifications for the Kenwood TR-7900
TR-7800/TR-9000 Optional Ceramic Filters
FM Adjacent channel rejection in either unit may be improved by installing
an optional narrow ceramic filter.
Filter Part No. -6db Bandwidth -70db Bandwidth Retail
CFK-455F L72-0304-05 +/- 6 kHz +/- 12 kHz $ 33.50
CFK-455G (CFK-455G)* +/- 4 kHz +/- 10 kHz $ 33.50
* Not original part. No computer part number.
TR-7800, RX unit X55-1270-10 part, L10
TR-9000, RX unit X55-1260-11 part, CF1
To install, desolder the original filter and clear the second set of holes
for the optional filter. Solder the new filter in place. Be sure all pins
are actually soldered, and that there are no solder bridges between pins or
across the printed circuit board. Clip the pins flush to the board, and
reinstall the circuit board.
Note: Squelch operation will vary from unit to unit with an optional
narrow filter. Tighter coupling from the detector to the squelch circuit
may be tried to restore "original feel".
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