Galaxy Saturn base radio - no transmitted audio.
I have a Galaxy Saturn which I discovered that the AM limiter had been removed before i brought it. It also drifted terribly so I haven't used it a great deal.
I decided that it should be pretty straight forward to source a replacement transistor and solder it in as I don't believe that there is anyone in the UK that will work on this model of Galaxy.
I soldered in the transistor, and hooked up the radio to a modulation plus deviation meter.
Whilst the covers were off, I de-soldered the solder bridge from the crystol X2 to its adjacent can, after researching that this can help reduce the frequency drift. And it has! It had dropped in frequency a little, but I corrected that (and also had to slightly adjust the frequency display). Now the displayed frequency does not change on the front of the radio, hot , cold, or in between! the problem I have is that the radio has no transmitted audio now.
Zero modulation on AM, but there is a carrier. FM transmits, but with no audio, and SSB does nothing. If I remove the transistor tr32, audio is restored. transistor appeared to check out on a meter, but I ordered two so I put another 945 transistor into the board and lost audio again!!
The PA on the radio works with or without the TR32 installed, so I know the mic hasn't just gone bad, and correct me if I'm wrong, but suggests that the audio chip is working.
I have properly run out of talent re this problem, and wonder if anyone out there has experience (or repaired) something similar. I would really like to use this Base radio as it appears to deal with local interference on RX much better than the resent Chinese multi-modes do, and its in real nice cosmetic condition too!
Any suggestions or info with be greatly appreciated!
Cheers,
Darren 26TW06
I have a Galaxy Saturn which I discovered that the AM limiter had been removed before i brought it. It also drifted terribly so I haven't used it a great deal.
I decided that it should be pretty straight forward to source a replacement transistor and solder it in as I don't believe that there is anyone in the UK that will work on this model of Galaxy.
I soldered in the transistor, and hooked up the radio to a modulation plus deviation meter.
Whilst the covers were off, I de-soldered the solder bridge from the crystol X2 to its adjacent can, after researching that this can help reduce the frequency drift. And it has! It had dropped in frequency a little, but I corrected that (and also had to slightly adjust the frequency display). Now the displayed frequency does not change on the front of the radio, hot , cold, or in between! the problem I have is that the radio has no transmitted audio now.
Zero modulation on AM, but there is a carrier. FM transmits, but with no audio, and SSB does nothing. If I remove the transistor tr32, audio is restored. transistor appeared to check out on a meter, but I ordered two so I put another 945 transistor into the board and lost audio again!!
The PA on the radio works with or without the TR32 installed, so I know the mic hasn't just gone bad, and correct me if I'm wrong, but suggests that the audio chip is working.
I have properly run out of talent re this problem, and wonder if anyone out there has experience (or repaired) something similar. I would really like to use this Base radio as it appears to deal with local interference on RX much better than the resent Chinese multi-modes do, and its in real nice cosmetic condition too!
Any suggestions or info with be greatly appreciated!
Cheers,
Darren 26TW06