Re: Kenwood TS430s AM filter operation
Because I wasn't sure if I'd remembered correctly I dug my old 430S out and tried out the various wide and narrow filters on AM/SSB and this is what I ended up modifying it to.
AM Wide (6kHz filter)
AM Narrow (6kHz filter)
SSB Wide (6kHz filter in Rx)
SSB Narrow (2.4kHz filter)
It looks like I didn't bother trying to keep the narrow filter switch setting on AM and I just swapped the SSB modes. I really can't remember for sure but I think the standard fitting instructions for the wide AM filter mean that you get the wide AM filter on both wide and narrow settings. AM reception with the standard/narrow 2.4kHz filter was not pleasant at all so I don't miss it.
This was 35 years ago but I did some other mods at the same time. I put a stronger mixer on the FM board and changed the FM IF filter for a better one. I also changed the way the s meter was driven in FM mode as it was a bit of an all or nothing indication with the standard circuit. I also modded the synthesiser board to improve the phase noise on the first LO.
__________________
Regards, Jeremy G0HZU
|