Just checking in and saying hi....

[guitar_199]

I'm the nut that does this, once in a while, for retirement "fun".

Putting a radio on the bench to see what is up with it.... (one of the many radios I bought JUST TO SEE if it needed anything fixed... or maybe just an alignment!).

So... there may ACTUALLY be nothing wrong with it... in which case... I will just align it and put it back in the box.

The patient is a Midland 150M.

Don't know anything about it.... but I will soon. (yep.. that is the microphone right behind it!)

 

[guitar_199]

okay... it needs fixing!!!!!!!!

Both RCV and TX (carrier only) work for 2 to 3 minutes.
WHILE it is working....
modulation audio does NOT work,
RCV audio DOES work great,
PA does NOT WORK EVER.

Something is happening after a few minutes that shuts of BOTH RCV and TX.
I also notice that the combination TX/MOD LED quits lighting when I key down AFTER the failure. It DOES LIGHT UP before failure.

If you turn it off for 3 to 5 minutes or so...... it all works again... for a couple of minutes.... then dies again.... repeat ad nauseum.

So Iam thinking two problems here:

1. Something in PLL/VCO/Frequency Generation is "croaking" that disables the radio in both RCV & TX, and

2. RCV audio works but MOD/PA don't: something is wrong in microphone or mic audio path up to the audio amp itself where it joins the RCV audio.

Got the SAMS on it.... so I am good to go!!!!!!!

(not looking for help so much as.... sharing my insanity!)

 

[guitar_199]

Recently repaired mic tester.... says mic is NOT producing audio out. Don't know the reason yet.... (wiring or element????). But I'm pretty sure the mic is the problem on the MOD & PA issue.