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Galaxy DX2517 extremely low power

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Old 03-28-2010, 09:01 AM
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Default Galaxy DX2517 extremely low power


My Galaxy DX2517 has developed a problem on TX. I can get the radio to key on AM, FM, and SSB modes, but only a very, very tiny amount of power results.

Not even the slightest indication on a 5 watt scale meter. The radio indicates that it is modulating, and it can be monitored on another radio ( I can hear the audio). I was running SSTV when it happened, or just before it happened.

Ater testing SSTV transmit and receive, I disconnected everything to try to neaten up the wiring and all, and when I got everything buttoned back up, I went to transmit SSB voice with my mic and discovered that all of a sudden I have almost no power!

Any ideas? I wonder if I put too much audio from the soundcard into the microphone circuit... Could that possibly start a chain of events that could lead to this failure?

Thanks for any thoughts or advice at this point.
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Old 03-28-2010, 09:04 AM
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Ooops! sorry for the double post!
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Old 03-28-2010, 09:40 AM
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Quote:
Originally Posted by Highlander_821 View Post
Ooops! sorry for the double post!
Your fired! Turn in your mouse and clean out your locker.
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Old 04-22-2012, 04:27 PM
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I have a saturn that just started doing this.

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Old 04-22-2012, 05:00 PM
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Check the bias settings on the finals. Either those bias diodes are gone and it won't bias; or the final transistors are gone. If it was a modulation problem; then AM still should show proper dead key power. From what you have said - it doesn't. The reason you still see some power out, is probably because the driver transistor is still working.

http://www.cbtricks.com/radios/galax..._trans_adj.htm

http://www.cbtricks.com/cgi-bin/database/galaxy_db.cgi
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Old 04-22-2012, 06:06 PM
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Quote:
Originally Posted by liquidh8 View Post
I have a saturn that just started doing this.
Were you running SSTV as well?

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Old 04-23-2012, 05:52 PM
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Thanks for the links. Ill have to get it to do it first. I can talk on it for a while and all is good, then all of a sudden, nothing. After I turn it off and it cools down, then it is good again. the driver and finals are new from a few months ago.

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Old 04-24-2012, 03:15 PM
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Quote:
Originally Posted by Robb View Post
The reason you still see some power out, is probably because the driver transistor is still working.
that's very possible and most probable, but also possible is a missing/low tx mixer signal, could be the low output isn't even on 27 mhz, (very hard for a tuned output stage to amplify an out of band signal as efficiently as an inband one) power meters ain't smart enough to tell, but a frequency counter inline with it might,

this was actually seen by a friend on a magnum 257 that had both driver and final working but still low output, no reason it couldn't happen on any other uniden clone. caused a few people a lot of head scratching, always worth checking the oscillator signals are present, before you assume the rf amp is fooged.

time to get a scope and freq counter out.
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