[Elecraft] K2 frequency drift

[Stan Rife]

	I don't really see, or notice, any drift in my K2. I'm sure it does
a bit, but it must be a small amount, and negligible for my purposes

Stan Rife
W5EWA
Houston, TX
K2 S/N 4216
 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Sunday, December 24, 2006 2:26 PM
To: Kevin Schmidt; elecraft at mailman.qth.net
Subject: RE: [Elecraft] K2 frequency drift


Kevin,

The RA resistor on the thermistor board is intended to compensate for drift
AFTER warmup - such as drift that might occur due to the additional heating
when the KPA100 is transmitting.  I do not believe it would be fruitful to
attempt to compensate for the initial warmup drift that one may find in the
K2 - and you may wind up overcompensating and find the drift after a warmup
period would be greater - it would not be good to have a K2 that does not
drift when first turned on and then begins to drift after some warmup
period.

Or perhaps better said, the thermistor board provides compensation for the
PLL reference oscillator.  There are many more components involved in the
initial warmup drift - the BFO is one.

It would be interesting to try, but would take a lot of controlled test
conditions to verify the results.

73,
Don W3FPR

> -----Original Message-----
>
> The K2 PLL Ref Upgrade manual gives some information on typical drift i.e.
> 5 to 20 Hz per 15 degrees F on 20 meters. It also explains how changing RA
> on the thermistor board can better compensate for the drift.  Since your
> drift is consistent, I think you should be able to reduce it by adjusting
> RA on the thermistor board.
>
> 73 Kevin w9cf
>
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