[Elecraft] K3 External Reference input

[Paul Christensen]

> The 7800 has some decimation error issues and can be off from the
> standard by up to 0.1Hz  A simple demo of this is to put main and sub RX 
> on the same signal on
> the same antenna and listen in stereo for the slow phasing that goes on
> between the 2 receivers, it's horrid and makes it a very poor diversity
> receiver.

That's likely why Icom has yet refused to add auto Main/Sub tracking.  OTOH, 
one of the first tests I conducted was to sync the 7800's Main and Sub 
receivers and sample the audio into an oscilloscope in X-Y mode to establish 
a Lissajous pattern.  Any phase shift is represented by a change in the 
pattern from a straight line to a fuzzy line, then to what appears as a 
fuzzy ball.   I could leave the 7800 running for days and not notice any 
phase shift unless I induced the phase shift (e.g., moving the sub Rx by 1 
Hz, for example).

Paul, W9AC