Hi I’ve always found that pin 9 (EFC monitor) gave you a pretty good idea of the lock status.
Bob > On Mar 22, 2016, at 8:43 AM, Wayne (gmail) <wayne.hol...@gmail.com> wrote: > > The BITE signal is the only way to to know if it has a lock... > > Wayne > >> On Mar 22, 2016, at 4:37 AM, Bob Camp <kb...@n1k.org> wrote: >> >> Hi >> >> There are probably a dozen or more things that contribute to the BITE >> output. It could be >> a regulator out of range. It also could be the VCXO nearing tune limit. If >> the unit locks up and >> seems to work, I’d ignore it and move on. >> >> Bob >> >>> On Mar 21, 2016, at 9:42 PM, Wayne Holder <wayne.hol...@gmail.com> wrote: >>> >>> I have a surplus LPRO-101 that seems to power up OK. The power draw starts >>> at 1.7 Amps and then, after a few minutes, drops down to 600 mA, or so and, >>> after this startup, the output shows a 10.000 MHz signal thats 's >>> accurately as I can measure it. The lamp voltage is 6.2 volts, which seems >>> within spec. However, the BITE signal that's supposed to indicate lock >>> with a LOW level is always LOW and never changes. The docs say that BITE >>> signal should start at a HIGH level to indicate no lock and then drop to a >>> LOW when lock is obtained. So, this behavior seems all wrong. >>> >>> I opened the case and observed the purple glow of the lamp and probed >>> around IC U401, which buffers the BITE signal, and saw the same signal LOW >>> level. U401 is getting 5 volt power and the inputs to the AND gate used as >>> a buffer for the BITE signal match what I'd expect. But, lacking a proper >>> schematic, I'm not sure how to trace this back to the problem. Has anyone >>> ever seen a symptom like this with an LPRO101? >>> >>> Wayne >>> _______________________________________________ >>> 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. _______________________________________________ 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.