[Elecraft] Auto-spot, tuning aids, and the arcane history of CW pitch-matching

[Dave New, N8SBE]

When I upgraded from my K3 to a K3s, I took the opportunity to order a
10 MHz Ref In option.

I finally got around to hooking it up to a Leo Bodnar GPS receiver I
picked up at Dayton a year ago, and now the K3s is rock solid spot on
frequency.

Don't know how i did without it all these years...

73,

-- Dave, N8SBE

-------- Original Message --------
Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history
of CW pitch-matching
From: Bob McGraw K4TAX <rmcgraw at blomand.net>
Date: Tue, January 22, 2019 3:14 pm
To: elecraft at mailman.qth.net

Another trick which works well.   Tune to a WWV frequency in CW mode.
Press SPOT and the radio will jump on the exact carrier frequency.   The
SPOT function can pull on to the WWV frequency as far away as about 100
Hz.  Once the radio has  resolved SPOT, the readout / display is the
frequency of WWV +/- the error in Hz. Thus the readout of 9.999.992 is
indicating being 8 Hz low.

 From a cold start, FP being 19°C, I find  -8 Hz error on 10 MHz WWV.
After about 15 minutes the FP is 25°C and the error is -1 Hz.  I've
tweaked the REF CAL such that after 1/2 hr. in receive tuning to WWV
from both higher and lower will produce a reading of 10.000.000.   Will
all stations pse QNZ  QNN.

73

Bob, K4TAX