Hello all, I recently received from IRC/Fox Tango the 455 KHz and 8830 kHz
400Hz cw filters for my TS 690S (TS 450 with 6 meters). I installed these
filters over the weekend and they sound great. Now the problem. Once I
installed the filters and accessed their selection via the menu system, I
then tried to switch bands. My normal procedure is to change bands on the
radio, select the correct antenna and then push the auto tune button on the
radio (internal auto antenna tuner installed). Well once I hit the Auto
Tune button the radio showed no output power and no SWR indication on the
meter. The antenna tuner was searching around like crazy for a match and
every once in a while during this process the power output meter would
display a very low power and an infinite SWR then it would go back to no
indication (no power out). I then removed both filters and put the rig back
in its original state and everything worked fine, the tuner tuned, and I had
full power out. I then installed one filter at a time and checked the power
out after installing each. I first installed the 455 kHz IF filter and
checked the transmit side and I had full power out and the rig worked fine.
I then installed the 8830 kHz IF filter and the no power output problem came
back. I made sure the bottom leads of the filter were not shorting against
the PC board so that can be ruled out. Also it didn't matter which filters
were selected via the front panel, with the 8830 IF 400 HZ filter in the
radio (though not selected) I still had no power out. I think that the
transmit signal goes through the filters during transmit but I'm not sure
how all this works.
The bottom line is I'm looking for any assistance from people that have
experienced similar problems or someone that knows the TS 450/690 radio well
enough to advise me on any alignment procedures that are required to allow
this crystal filter to work.
I did call the technical branch of IRC/Fox Tango and he said "If it works in
receive it should work in transmit". Not much help. Thanks and 73, Jack
WB4NFS
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