[Elecraft] Tr: K3 Ref connector

[Paul Christensen]

> As a result phase locking or replacing the internal REF with a highly
> stable and accurate external source is not likely to be very useful.

Brendan raises an interesting point.  I use an HP 58540A GPS/DO with an 
IC-7800 and note some of the same decimation errors that he addresses --  
although my long term accuracy is much better than +/- 0.25 Hz, but 
certainly not anywhere near the accuracy offered by the GPS/DO for the 
reasons that Brendan stated.  That said, anyone know the maximum accuracy 
deviation owing to decimation error when using the K3's architecture?

Although my K3 has the high-stability TCXO option, the long-term accuracy of 
the IC-7800 with HP 58540A is still significantly better.  Note that I'm 
discussing the long-term stability.  To some extent, Elecraft's forthcoming 
TCXO calibration algorithm may better match the characteristics of the TCXO 
and offer better long-term stability over that which I'm now measuring.

The importance of this is pretty much relegated to a footnote.  Not many of 
us need the extreme levels of accuracy we're discussing, but it's an 
interesting exercise to extract the highest degree of frequency accuracy 
possible from any transceiver.

Paul, W9AC