[Elecraft] Rig drift

[k6se@juno.com]

Ron, AC7AC wrote:

"If you use RIT or, as I prefer, SPLIT, then you just tune to put the
signal in the center of the IF bandpass without changing the xmit
frequency. There should be no reason to shut down and recalibrate even if
it is drifting. That's what I do if I sit down to a cold rig. Of course,
it isn't even apparent unless I am using an IF selectivity of less than
400 Hz."
==========
Using the RIT or split has nothing to do with and doesn't "cure" the
problem.  My transmit and receive frequencies are the same, no matter
what the temperature is (I think!).

The problem is drift (BFO or PLL, or a combination of both) where, if you
use Spectrogram to look at a received signal at the pitch your SPOT is
set at, the signal is outside of the filter passband when cold and drifts
into the passband as the temperature increases (and drifts out the other
side of the passband if the temperature continues to increase).  Using
RIT has nothing to do with this.

This problem has been also mentioned by others on this reflector.

73, de Earl, K6SE