[Elecraft] XV222 Mods Question

[Jim Brown]

On 6/10/2021 2:37 PM, Mike Cizek W0VTT wrote:
> 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.

Hi Mike,

More than 15 years ago, while still living in Chicago, I bought used 
Elecraft transverters for 50, 144, and 220 MHz, to use with my K2. The 
two that I had occasion to use were unstable. A simple study of their 
construction made it obvious why.They were designed and built with Pin 
One Problems -- RF inputs and outputs are BNC fittings insulated from 
the shielding enclosure, as badly conceived non-solution to a stability 
problem lurking somewhere on the PCB, and the isolated BNCs were an 
inappropriately chosen band-aid.

EMC guru Henry Ott talked in his seminars about "the hidden schematic 
lurking behind the ground symbol," and the unintended current paths that 
resulted from ignoring it.

73, Jim K9YC