Hello,
I have a galaxy 2527 dx that after i use it for a while, the
modulation gets all garbled on AM,
I noticed that the audio output ic got very hot, I placed a small
computer fan on the back side of the heat sink that the ic is mounted
to. It still acts up after a little usage, So I replaced the audio
output ic it is a TA 722ap, still getting garbled modulation after
about 10 min. of usage. Can anyone help me with what else could be
causing this ? Thanks for reading this post. you can email me with any
suggestios that you might have. 73.

Dave

wrote in
ups.com:

Hello,
I have a galaxy 2527 dx that after i use it for a while, the
modulation gets all garbled on AM,
I noticed that the audio output ic got very hot, I placed a small
computer fan on the back side of the heat sink that the ic is mounted
to. It still acts up after a little usage, So I replaced the audio
output ic it is a TA 722ap, still getting garbled modulation after
about 10 min. of usage. Can anyone help me with what else could be
causing this ? Thanks for reading this post. you can email me with any
suggestios that you might have. 73.

Dave



Don't modulate.

SC

Slow Code wrote:
wrote in
ups.com:

Hello,
I have a galaxy 2527 dx that after i use it for a while, the
modulation gets all garbled on AM,
I noticed that the audio output ic got very hot, I placed a small
computer fan on the back side of the heat sink that the ic is mounted
to. It still acts up after a little usage, So I replaced the audio
output ic it is a TA 722ap, still getting garbled modulation after
about 10 min. of usage. Can anyone help me with what else could be
causing this ? Thanks for reading this post. you can email me with any
suggestios that you might have. 73.

Dave



Don't modulate.
I am truely glad you don't give your call since you are clearly not a
good ham

SC

Hello slow code,
Well, when I asked for some help, I did not expect snyde
remarks. I thought perhaps someone in here could shed some light on the
problem that I was having, Thanks for the remark Slow Code, I hope that
someone else can help.

Dave
Slow Code wrote:
wrote in
ups.com:

Hello,
I have a galaxy 2527 dx that after i use it for a while, the
modulation gets all garbled on AM,
I noticed that the audio output ic got very hot, I placed a small
computer fan on the back side of the heat sink that the ic is mounted
to. It still acts up after a little usage, So I replaced the audio
output ic it is a TA 722ap, still getting garbled modulation after
about 10 min. of usage. Can anyone help me with what else could be
causing this ? Thanks for reading this post. you can email me with any
suggestios that you might have. 73.

Dave



Don't modulate.

SC

"Dave" wrote...

Hello slow code,
Well, when I asked for some help, I did not expect snyde
remarks.

You don't know the group well, do you?

I thought perhaps someone in here could shed some light on the
problem that I was having,


Audio ICs can get warm, but I assume you have abnormal temperatures. Overheating
audio ICs can start to act in strange ways, so it could explain the distortion.
It is important that, while you have this problem, you do not run the set for too
long. Even if the heat does not instantly pop the IC, high temperatures will
shorten it's life or destroy it over time.

First of all, I would check the supply voltage to that IC.
If that is fine, I would consider the possibility of a leaky electrolytic capacitor
around the IC, possibly the capacitor blocking DC on the output.
The voltage on the output pin of the typical CB audio IC should be about
1/2 the supply, and there should be no DC across the speaker. You could
plug a jack into an external speaker socket and look for a voltage across
the pins.


I hope this is a little more helpful.


Regards,

Peter.
http://www.citizensband.radiouk.com/