Lance,
As you know I am active on 2m-eme. I can't give any opinion on the
K144XV but have a couple comments on frequency stability requirements
for JT65B.
Many stations use the "Freeze" function to reduce the decode spectrum
to 20-Hz. Mainly this is in a crowded band with many stations
calling. Therefore, I would say one needs overall frequency to stay
within 20-Hz. My DEMI 144-28 transverter drifts upward 5-Hz after
running JT65 30-minutes at 50w. My K3 adds about 2-Hz to that
keeping the total drift easily within a 20-Hz target.
I have the K3EXREF installed with a surplus OCXO from e-bay (approx.
$45) as 10-MHz standard. That keeps the K3 at 28-MHz within +/- 2-Hz
(or 0.1ppm). Without the K3EXEF the K3 runs about 14-18 Hz off freq.
which is close to the TCXO3-1 spec of 0.5ppm. The transverter runs a
PTC heated xtal oscillator on 116-MHz.
Actual drift on 28-MHz has not been measured on the K3 so it may be
less. You may be happy running the k3 without the K3EXREF. It would
all depend on the additional drift of the K144XV (so maybe some who
have this will comment).
73, ED - KL7UW
PS: I have another DEMI 144-28 transverter with a VHF PLL and it is <
+/- 1Hz. I installed the PLL to have two LO freq. (116 $ 118 MHz)
and for use with mw transverters.
---------------------------------------------------------
Date: Thu, 14 Feb 2013 14:56:47 +0000
From: "Lance Collister, W7GJ" <w...@q.com>
To: Elecraft Mailing List <elecraft@mailman.qth.net>
Subject: [Elecraft] K3 with 2m module K144XV
Message-ID: <511cfb2f.3060...@q.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I need some guidance. I have a K3 with the optional high stability reference
oscillator option. I have been very pleased with the frequency
stability of the unit
up through 6m. Next month I am interested in ordering the K144XV so
I can also use
the rig for 2m EME with JT65B mode.
Is there anyone out there currently using such a setup successfully
on 2m EME? Is
it stable enough as-is, or will I need to also add the K3EXREF and
some additional
outboard frequency standard? I would like to avoid involvement with
the K3EXREF
unless it is required. I do not plan to use the K3 2m as an IF for microwave
transverters, so I hope it will be stable enough on 2m without
it. I look forward
to your experience! MNI TNX and VY 73, Lance**
--
Lance Collister, W7G
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