[Elecraft] XV222 Mods Question

[Mike Cizek W0VTT]

Greetings,

 

I recently purchased a used XV222 that had some modifications done in the
local oscillator circuit. The construction was very sloppy, but transverter
works OK most of the time.  Power output is adequate with good audio on SSB
and receiver sensitivity seems OK.  Sometimes the xvtr goes in to parasitic
oscillation.  I can stop the oscillation by touching certain parts of the
case, and it will operate normally for a while.  Weird.  I cannot find any
documentation about the mod on line.

 

It appears that two 2.2 pF caps have been added (on the bottom side of the
board) in parallel with C12 (10pF), and the collector of Q1 goes above the
board directly to Z4 instead of into its hole in the PCB.  Has anyone seen
this mod or the reason for it documented anywhere?

 

Thank you.

 

----

73,

Mike Cizek W0VTT

New Kid on VHF