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.