Wayne, etal:
I'm asking for someone else that has the K144XV (I don't).
With the addition of the K3EXREF and K144RFLK, and assuming you have
the TCXO-3, what is the expected freq. stability expected? The
K3EXREF is published at 0.05ppm. At 144-MHz, 0.05ppm would be 1.44x5
= 7.2 Hz.
That is equivalent to the +6-Hz error of my new DEMI 144-28
transverter using a 116-MHz xtal oscillator. I see drift up to 11-Hz
after one-minute key down at 50w.
The K144XV would have the stability of the TCXO-3 in transmit
(0.5ppm) which probably will drift only a few Hz at worst (based on
my experience with the K3EXREF+TCXO-3 on 50-MHz where transmit drift
was not more than 3-4 Hz total error). The TCXO-3 plus K144RFLK
without the K3EXREF would have 0.5ppm or up to 70-Hz at 144-MHz (by
my calculation).
From that, I would encourage anyone that is planning to run digital
modes like WSJT on 2m to install the K3EXREF with the K144RFLK. You
want to maintain <25Hz drift on these modes. We often run the WSJT
sw with only a 25-Hz decoding window so if you signal drifts outside
that it will affect detection. To be fair I see many 2m eme signals
that drift up to 50 Hz in one minute transmission. I just open the
decoding window to 50 or 100Hz for them. Note: WSPR is the most
demanding of the digital modes on freq. stability.
73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter?
DUBUS Magazine USA Rep
[hidden email]
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