[Milsurplus] MAK Transmitter osc

[Richard Brunner]

This is a common  problem.  I had a Yaesu FTdx-500 with a multitude of 
problems, one of which was the crystal controlled BFO mostly wouldn't 
oscillate.  I added 1.5 inch insulated wires to grid and plate and it 
worked like a champ.  I intended to  twist them but it wasn't 
necessary.  Yaesu had pretty good design, but no quality control - must 
be half their stuff came out of the factory not working properly.

Richard, AA1P

>> Ray:
>> Viewing the schematic, the plate output tuning network provides the 
>> phase-shift necessary
>> to sustain oscillations, IFF the crystal is very active. The 
>> capacitor at the bottom of the plate
>> tuning network is connected to the cathode, then cathode being the 
>> "common" between the
>> grid and the plate.
>>
>> If that was my rig, I would simply connect a SMALL capacitance, a 
>> "gimmick" capacitor,
>> directly from the plate to the grid
>>
>> You won't need much. 1 to 2 pfd and not more than, say, 5 pfd, should 
>> be enough to get any
>> crystal working.
>