Hi Beale,
Thanks for those suggestions. I had looked at that FAQ already, and when I
checked the unit (before I inverted it) with a counter coupled to the 1pps
signal from my GPSDO for its timebase, it was swinging through 10MHz
(from -230Hz to +36Hz). But not evenly on either side, and it was spending
somewhat longer below 10MHz than above.
However I will try returning it to the 'right way up' position, then opening
it up and running adjusting trim cap C217 to see if I can get it to swing
equally either side of 10MHz. Hopefully I should then be able to get a
reliable lock even 'right way up' -- right?
Cheers,
Jim Rowe
-----Original Message-----
From: beale
Sent: Saturday, February 08, 2014 6:40 AM
To: [email protected]
Subject: Re: [time-nuts]How I got my FE-5680A to lock in Sydney, Australia
The entry in the FE5680 FAQ on this subject may be helpful, if you haven't
tried it already.
http://ko4bb.com/dokuwiki/doku.php?id=precision_timing:fe5680a_faq#what_if_my_5680a_output_does_not_lock_up_after_several_minutes
I have 3 of those units; one did not lock until I adjusted the trim-cap C217
to bring the free-running frequency of the oscillator into range. If you
have a reasonably accurate counter you can check if this is the problem or
not by seeing if the output frequency (which ramps up and down prior to
lock) crosses through 10.000000 MHz or not. Mine did not.
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