[time-nuts] FE-5680 frequency change

Rob Kimberley rk at timing-consultants.com
Mon Nov 2 22:22:19 UTC 2009


Murray,

Many thanks!

Rob 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Murray Greenman
Sent: 02 November 2009 18:19
To: time-nuts at febo.com
Subject: [time-nuts] FE-5680 frequency change

Rob,

It will depend on which version you have. I've not seen a dedicated
15MHz unit, so can't be sure which synthesis scheme it uses.

If it has a dedicated fixed synthesizer, you may be out of luck.
However, if (like the 1pps models) it has a DDS synthesizer, the
frequency change can be done via a serial command. For details see:

http://www.mail-archive.com/time-nuts@febo.com/msg13486.html
http://www.leapsecond.com/museum/fei5650a/
http://www.qsl.net/zl1bpu/PRECISION/FE-5650A.htm

The DDS board can be identified by comparing it with the photo at:

http://www.leapsecond.com/museum/fei5650a/freq_divider.jpg

Bear in mind that the photo might be the other way around from the angle
you get to view it at.

If you have the DDS version (it's the same in the FE-5650A and
FE-5680A), you're in luck, and can program any frequency from DC to
20MHz or so.

You might consider buying another dedicated unit for 2.048MHz. Bob Mokia
(NHBBob on Ebay) has the 1pps versions for sale, and these are easily
converted to remote frequency programming, as described in the links
above.

Regards,

Murray Greenman


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