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K3XREF Question

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W7CS

K3XREF Question

Hi Don and All

IMHO using a GPS disciplined 10 MHz (Trimble etc.) or a Rubidium
standards are unnecessary , expensive and overly complicated
approaches, to be used as the K3XREF 10 MHz external source.

There are extremely stable (as high as 10 x-12th) Double Oven
Controlled Xtal Oscillators (OCXOs) available on the Off Shore
surplus market, for under $50 delivered. These are pulls from US
built surplus equipment, and are guaranteed and tested . I have
bought several, and the latest one has been bench tested for several
months, and after initial adjustment has not varied a single cycle on
my GPS locked counter. Even this stability, is an overkill, when
used as an external reference for the "frequency", not "phase" locked K3.

These OCXOs are less than 2" cube in size and available on e-Bay from
several dealers. Check e-Bay under the subject OCXO.

Chuck, W7CS

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ke9uw

Re: K3XREF Question

Yes. I have had the GPS system and also the Rubidium and other than seeing my HP counter with the oven controlled oscillator agree with them from time to time, I have to say it was pretty boring. Eventually both the standards broke and the HP is still with me.

Chuck, KE9UW
Lionel Trains, TCA, LCCA, LRRC
aka Jack, BMW Motorcycles BMWMOA #224

________________________________________
From: [hidden email] [[hidden email]] on behalf of Chuck Smallhouse [[hidden email]]
Sent: Thursday, February 14, 2013 6:18 PM
To: [hidden email]
Subject: [Elecraft] K3XREF Question

Hi Don and All

IMHO using a GPS disciplined 10 MHz (Trimble etc.) or a Rubidium
standards are unnecessary , expensive and overly complicated
approaches, to be used as the K3XREF 10 MHz external source.

There are extremely stable (as high as 10 x-12th) Double Oven
Controlled Xtal Oscillators (OCXOs) available on the Off Shore
surplus market, for under $50 delivered. These are pulls from US
built surplus equipment, and are guaranteed and tested . I have
bought several, and the latest one has been bench tested for several
months, and after initial adjustment has not varied a single cycle on
my GPS locked counter. Even this stability, is an overkill, when
used as an external reference for the "frequency", not "phase" locked K3.

These OCXOs are less than 2" cube in size and available on e-Bay from
several dealers. Check e-Bay under the subject OCXO.

Chuck, W7CS

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

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Chuck, KE9UW