[Elecraft] Rig drift

Sun Sep 29 11:42:00 2002

The behaviour described by Earl and others must be rig specific.  I
regularly check in to several SSB nets and have the frequencies stored in
memory.  From a cold start I can recall the net frequency and be within
10 to 20 Hertz immediately and almost never have to touch the VFO
throughout the net sessions that can last upwards of 4 hours.  About the
only time I do is if one of the check-ins is slightly off frequency and
then I use RIT.  I run with the KPA100 installed and the fan kicks in to
high after longer transmissions but still no discernable drift.

On CW I have the beacon frequencies set on the B VFO for 20 - 10 meters
and all I need to do to copy the beacons is hit the B VFO and switch mode
to CW.  Again no tweaking of the VFO even from a cold start.

Must be a little mojo on the charcteristics of the components for my K2
such that they compensate one another as the temp inside the rig changes.
 I haven't done this with temp extremes as my operating room is pretty
constant at 75-80 deg F.

73,
Mike WA3KYY K2 #2221

On Sat, 28 Sep 2002 09:23:19 -0700 Earl, [email protected] writes:
> 
> 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
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