[time-nuts] FE-5680A won't lock

J. L. Trantham jltran at att.net
Wed Jan 18 08:03:18 EST 2012

Use one of your 'locked' Rb as the 'standard' and then look at the 10 MHz
from the 'problem child'.  See if you can adjust C217 (I think.  Look at the
archive.) to bring the 10 MHz signal close to the 'standard'.

Perhaps the oscillator is just out of 'range' and can be brought back into
range where the loop can lock it.  Or maybe that is what you have already

Both of my units get quite 'toasty'.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Scott Newell
Sent: Tuesday, January 17, 2012 10:31 PM
To: time-nuts at febo.com
Subject: [time-nuts] FE-5680A won't lock

Just got my 3 in from nichegeek.  Paid Thursday, shipped Friday, 
arrived this evening.  Wow.  (Actually arrived too quickly--I don't 
have my t-bolt running, so I can't easily do an accurate frequency check.)

Two power up and lock in <3 minutes.  One powers up, gets toasty, and 
gives 10MHz, but no lock and no PPS.

The tuning config on all three read back as 0.  I've set the problem 
child to near +/- FS and about +/- 25% of tuning range: still no lock.

Any suggestions on what I should look for or try?  I'm not quite 
ready to throw in the towel and contact the seller.

newell N5TNL

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