[Elecraft] KREF3 External Reference Option

[Nige]

I appreciate everyone's enthusiasm to convince me and was warmed by an off-list message from Wayne but as I explained to Wayne, my Flex is accurate to less than 0.03 Hz @ 50 MHz and the suggested specification for the KREF3 is about 1Hz @ 20 MHz. That is an order of magnitude away from what I consider acceptable when driven by a Reference to 10e-14/H.

I'll keep watching the evolution of this in case the boys at Ele can work their magic.

All the best,

Nige.




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Message: 11
Date: Wed, 08 Sep 2010 10:24:42 -0800
From: "Edward R. Cole" <kl7uw at acsalaska.net>
Subject: Re: [Elecraft] KREF3 External Reference Option
To: Elecraft at mailman.qth.net
Message-ID: <201009081824.o88IOgNG029892 at huffman.acsalaska.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed

One of my prime considerations choosing the K3 was for the Ext. 
Ref.  For the interim, I decided on the high accuracy 1/2-ppm 
TCXO-3.  I am pretty happy with it as is, but will get the external 
option when it becomes available since I have a master freq. 
reference OCXO for the station and a Rubidium standard for my 
frequency counter (good to 26-GHz).  I am QRV 600m to 3cm. and will 
add 24-GHz in the near future.

I am required to have <1 Hz error on 495.053 KHz under my WD2XSH/45 
license.  I have a DDS synthesizer with that accuracy/stability and 
the K3 is dead on with it.

So Nige, do not be put off by this issue if it is what is deciding 
you against the K3.

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Message: 12
Date: Wed, 8 Sep 2010 07:29:27 +0100
From: David Pratt <david at g4dmp.fsnet.co.uk>
Subject: Re: [Elecraft] KREF3 External Reference Option: Detailed
         proposal
To: Nige <nige1 at hotmail.com>
Cc: elecraft at mailman.qth.net
Message-ID: <uPSuysBH1yhMFwHX at g4dmp.fsnet.co.uk>
Content-Type: text/plain;charset=us-ascii;format=flowed

This is coming, Nige; see Wayne's msg on the reflector on 15 June at
00:15:39 ....
===SNIP
In a recent message, Nige <nige1 at hotmail.com> wrote ...
 >
 >Wow that was a close one. I was planning to buy a loaded K3 + P3 as a
 >back-up radio for my Flex 5K which does have an external reference
 >input. The cart was loaded to go but now I know the K3 doesn't have
 >this capability this is very disappointing and I'll have to reconsider
 >what to do with my money.
 >
 >This really is a shame.
 >
 >Nige.
 >G7CNF
-- 
David G4DMP
Leeds, England, UK
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73, Ed - KL7UW, WD2XSH/45
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