[Elecraft] K2 drift

Wed Oct 23 09:02:00 2002

Hi

Yes you can remove X2 and improve the PLL drift. I have done this on seve=
ral K2's and it works. Check that you can get 10 KHz shift in the referen=
ce oscillator and then redo the PLL calibration. Check the shift by conne=
cting the counter probe to TP3 and select FCNTR mode, then tap band+ and =
band- to read the upper and lower limits of the reference oscillator. If =
by chance the oscillator does not shift 10 KHz then try the other crystal=
 at X1 (the one you removed from X2). I have not found a crystal that did=
 not have enough range so you should be OK

Don Brown
KD5NDB

----- Original Message -----
From: g3pjt
Sent: Wednesday, October 23, 2002 7:29 AM
To: [email protected]
Subject: [Elecraft] K2 drift

Hi

Having analysed ( as KI6WT note) the sources of drift in my K2 I find tha=
t
any drift is largely in the PLL rather than the BFO

Am I right in assuming that this drift can be reduced if I only use one
crystal rather than two at 12MHz provided that I can swing the 12MHz
oscillator by sufficient kHz so that the 5 kHz interpolation functions
correctly.

I know this topic has been raised here recently so sorry for the bandwidt=
h
but I can't find the reference.

73

Bob G3PJT  K2# 2642

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