Browning Mark III receiver no receive 1 thru 23

[hellcat]

My channels 1 thru 23 recently went out, my channels on the HF position all worked. My channels on the XTAL position ( lowers below one ) all worked as well. I bought a new crystal 31.400 for the 1 thru 23 and it worked half the time so I installed a new crystal switch, same problem.. I ordered a new crystal installed it and nothing, dead. I put the old crystal back in and it works for a couple of hours and then cuts out. You can move the crystal switch back and forth a couple of times and it will come back on, meanwhile the upper and lower channels work the whole time. Am I getting bad crystals or is the 31 MHZ oscillator out of whack? Any help would be greatly appreciated!

[sgtpepper]

There is a coil that you can adjust for the oscillator.

[sgtpepper]

The coil is L3, right beside the 12AT7,V3.

[hellcat]

In the photofact would that be L3? the 31MHZ oscillator? If this is off could it cause your receive to just drop out ?

[sgtpepper]

Yes, if it's not adjusted correctly. It could also be V3.

[hellcat]

Yea it’s just odd because the uppers and lowers never cut out

[Sandbagger]

Feb 26, 2020 20:38:46 GMT -5 hellcat said:

Yea it’s just odd because the uppers and lowers never cut out

Oscillators can be finicky. Some crystals are "stronger" than others. If the oscillator tank adjustment is peaked too high, weaker crystals could stop oscillating. The fix is to back off on the oscillator coil until all crystals work and do not cut out.

[hellcat]

Thank you sir, I will give it a try and keep you posted

[misteruniverse58]

you guys are the best on this forum,I had no receive on my browning m4,I took the advice coil L3 and v3,it paid off for me big time.

[hellcat]

Well apparently I had 2 weak or faulty crystals. A friend gave me a 31.400 crystal out of an old Mark 3 parts radio and works, has not dropped off one time. Everything works as it should, uppers, 1-23 , lowers good to go