K3 with 2m module K144XV

[Edward R Cole]

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" <[hidden email]>
To: Elecraft Mailing List <[hidden email]>
Subject: [Elecraft] K3 with 2m module K144XV
Message-ID: <[hidden email]>
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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[Dave-3]

Lance

Having tried the K3 with the high spec oscillator and with the external
locking I found I needed the external locking for my 144 digimode qsos.
However my eme shack varies between around 37F and 110F (outdoor garage) so
it is expecting a lot of the internal reference

External locking of the K3 also helped when using the internal transverter
to drive external transverters at 144MHz for 1296, 2304 and 3400 digital EME
qsos

If you lock the k3 reference and the 144 xverter inside the K3 it is vital
to do the mod at
http://www.elecraft.com/K3/mods/K3EXREF%20freq%20shift%20fix.pdf Not sure if
the "Production phase-in is pending." Mentioned on the web site has happened
yet

Dave

WW2R



From: "Lance Collister, W7GJ" <[hidden email]>
To: Elecraft Mailing List <[hidden email]>
Subject: [Elecraft] K3 with 2m module K144XV
Message-ID: <[hidden email]>
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, W7GJ

______________________________________________________________
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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[K7MDL]

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