[Elecraft] Rig drift

Sun Sep 29 12:37:01 2002

yes I am inclined to agree with this. my old k2 was set up exactly as
mike is describing. my shack temp ranges from 50 deg to 83 f depending
on how much heat or A/C i want to run. I have never noticed but a tad of
drift in 10hz range here
ken w8ob

Michael E Dobson wrote:
> 
> 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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