I am a new ham and acquired a gently used Kenwood TS-440S with the built-in tuner (AT), plus an MC-60 desk mic with the pre-amp in it. The radio has recently developed a problem, specifically it has intermittent low modulation on SSB thru the mic. I say thru the mic because when I experience the issue I can immediately go to PSK31, which pipes in the audio from the computer to the ACC2 (13-pin Din) connector on the back of the radio, and have output power once more while the PSK is "squealing" away. I don't use the speech processor as I always get "great audio" reports during phone QSO's without the proc.
I was hoping that maybe this is a known issue with the 440's. It will work just fine at times, and then at others I get no modulation....or should I say very little. I use my Kenwood TH-F6A (capable of Rx'ing HF) to monitor my phone transmissions and when the 440 isn't modulating I copy scratchy audio, like very low power signal coming out of the 440. I assume this 'hissy" reception is due to RF being picked up from the radio itself since I'm sitting in front of it while listening to the F6A. But when the 440 IS modulating it sounds like full-quieting into an FM repeater.
Any thoughts before I start looking for someone who is savy at working on 440's? If you know of someone good in the Austin, Tx area please let me know.
Thanks up front,