[Elecraft] Phase noise suggestions

[VR2BrettGraham]

G4BJM may have been talking to himself:

>Probably the main factor is screening of the VCO/PLL.  I'm not sure how
>feasible that would be?
>Geoffrey GM4SID suspects the sidetone modulates the VCO, and if so what
>other internal signals can effect it?  He also suggests D8 and D13 as
>possible noise sources - is there a feasible lower noise alternative?

The numerous reports of what appears to be the MPU getting into
the receive audio ("cricket" like sound [as in the insect] often heard in
receive audio when K2 responds to frequency polling via KIO) may be
worth considering, as I have found the same on transmit ["cricket" like
sound is heard in transmitted audio]).

I would think that this sort of thing needs to be sorted before it's
possible to pursue other nastiness.

Lack of power supply rail decoupling has been the source of
countless problems in another life dealing with digital TV set-top
boxes, but it used to be a fairly reasonable assumption that
sh*te on the rail stayed there.

Perhaps not so with the K2 - as it's the first rig I can hear
responding to remote control commands by just listening to
the receive audio... but perhaps my expectations are
unreasonable & this has been the correct behavior all along.

73, VR2BrettGraham