The signal on pin 9 starts at about 7.2 volts then slowly increments up to 14.5 volts over a period of about 138 seconds. It then seems to stay stuck at 14.5 volts and only repeats the cycle if I power down,w wait and then power back on.
Wayne On Tue, Mar 22, 2016 at 3:23 PM, Bob Camp <kb...@n1k.org> wrote: > 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. > _______________________________________________ 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.