I've fairly recently gotten one of these from a rather old guy for rather cheap, and it appears to work but audio is quiet on transmission and the power is very little on SSB (4 watts PEP blowing into the mic, 2 watt PEP or less whistling). AM carrier however is a perfect 4-5 watts. (Although AM audio is still a little quiet)
Here is a pic:
HOWEVER, if I connect the mic jack to my PC and play RTTY/Beeps/ETC, the TX power on SSB rises up to the completely normal 10-12 watts PEP (when I raise the audio volume to 25 mV) So it really seems like the mic gain needs to be adjusted.
I've already ruled out the microphone as I tried another mic with the same results. It seems like the mic gain is just too low.
I've found the service manual for the Sommerkamp german version of this radio, but when doing the alignment procedure I am unable to find VR4 anywhere, I do find RV4 though but it has no effect on anything i'm supposed to be tuning. I get the feeling that maybe they aren't exactly the same... The schematic I found was also too low-res to read anything.
I've got an oscilloscope and other more basic gear (DMM's, SDR's and so forth), unfortunately no signal generator for an RF source but RX on this radio is spot-on anyways so I don't plan to realign reception on this radio anywhere.
Any help would be much appreciated!
Cheers
)
