Hi The adjustment process is a bit slow. You need to get the VCXO into a range that it will lock *and* wait for the lock circuit to acquire the atomic resonance. The lock circuit takes "a while" to do this. I haven't timed the FE's, but tens of seconds is not uncommon. Given the low resolution trimmer, the proper setting may be easy to go right past.
Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Wednesday, January 18, 2012 11:47 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] FE-5680A won't lock Have you adjusted C217 while comparing the 10 MHz out of the 'problem child' to the 10 MHz out of one of your other 'locked' units? If so, and matched them as close as you can, and still it will not lock, I would contact the seller. Otherwise, it promises to be an in-depth learning experience that we all might benefit from. Joe -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Scott Newell Sent: Wednesday, January 18, 2012 8:17 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A won't lock At 03:50 PM 1/18/2012, Robert Benward wrote: >I got my first one from nichegeek and it took a long time to >lock. Someone suggested I adjust C217 which worked, but if I jarr >the oscillator it will go I've run it at least an hour without a lock. Tried running it open and adjusting C217, but still no lock. I've opened it up and spun C217 in 45 degree steps--still no lock. I'm seeing about 80 mA on the 5 V input, 1.6 A dropping to about 620 mA on the 15 V input. Any other suggestions before I contact the seller? thanks! newell _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.