One of the reasons I chose the K3 was eventual 10-MHz ext. reference
capability.
Well, then I guess someone will have to come up with a 49.380 PLL
circuit that uses 10-MHz as a reference. I have two such critters
for mw use. One is distributed out of Israel and will be used in
place of my 1152-MHz LO for 1296-MHz transverter (144-MHz IF). The
other (ApolLO-A32) will replace the LO for my 3400-MHz transverter
(also 144-MHz IF). Should be easier to do at lower frequencies.
The new line of VHF/UHF transverters from DEMI will have ext. ref.
option available in the future. It is already available on their mw
line (2.3-GHz and up).
73, Ed - KL7UW
------------------------------
Message: 2
Date: Wed, 09 Jun 2010 12:49:16 -0400
From: elecr...@g4fre.com
Subject: Re: [Elecraft] KREF3 External Reference card
To: elecraft@mailman.qth.net
Message-ID:
<S364279Ab0FIQtQ/20100609164916z+25...@ams003.ftl.affinity.com>
Content-Type: text/plain; format=flowed; charset="iso-8859-1"
This question is one I have been asking annually at the Elecraft booth at
Hamcom in Dallas for the last 2 years. I will be asking again on Friday. The
last information given was in jun 2008 when I was told "availability in Jan
2009", heard no dates since! Based on this I didnt order the high spec
reference for either of my K3.
Dave
ww2r
Message: 40
Date: Wed, 9 Jun 2010 16:51:53 +0100
From: David Pratt <da...@g4dmp.fsnet.co.uk>
Subject: Re: [Elecraft] KREF3 External Reference card
To: Elecraft Reflector <elecraft@mailman.qth.net>
Message-ID: <sz6xoxazi7dmf...@g4dmp.fsnet.co.uk>
Content-Type: text/plain;charset=us-ascii;format=flowed
I am afraid that I think you will find that it's on the back burner,
Trevor, but I hope Wayne will reply and then we shall all know once and
for all. I have been pushing for this for a long time as it would be
nice to be able to feed my 10MHz Rubidium standard into J3 to get near
precise calibration.
I suspect that the problem is due to the internal reference oscillator
of all our K3s being different. Although the KREF3 schematic shows the
oscillator to be on 49.380 MHz, we all adjust this during the K3
calibration procedure. (Mine is on 49.379744)
I could be wrong, but I shall await Wayne's response.
73 de David G4DMP
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