[TenTec] Ten Tec 1320 Instability

[Wj5mh at aol.com]

Occasionally, my 1320 will slightly jump frequency between the first dit and 
the second dit (or dash) in a string.  This usually happens at the higher 
frequency setting of the VFO within the band.  I saw this problem mentioned 
in the archives, but never was able to find an answer to the gentlemen's 
problem.

After looking at the schematic and comparing the amplifier chain of the VFO 
with other circuit designs, I decided to place a .1 uf cap directly across 
the emitter resistor, R57, of the VFO output amp Q18.  (Many designs show two 
resistors here with only one being bypassed.)

Books indicate that I've added some degenerative feedback...  By doing this, 
I've corrected the problem.  My question is...what else have I done?

Thanks,
Joe ( WJ5MH )