[Elecraft] KREF3 External Reference card

[Edward R Cole]

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

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Message: 2
Date: Wed, 09 Jun 2010 12:49:16 -0400
From: elecraft at g4fre.com
Subject: Re: [Elecraft] KREF3  External Reference card
To: elecraft at mailman.qth.net
Message-ID:
	<S364279Ab0FIQtQ/20100609164916Z+25918 at ams003.ftl.affinity.com>
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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 <david at g4dmp.fsnet.co.uk>
Subject: Re: [Elecraft] KREF3  External Reference card
To: Elecraft Reflector <elecraft at mailman.qth.net>
Message-ID: <sz6xoxAZi7DMFwlS at g4dmp.fsnet.co.uk>
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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