[time-nuts] LPRO-101 BITE (~lock) Signal Always Low

[Luca Dal Passo]

Hi,
    you can check the behaviour of the XTAL V MON voltage to get some
useful information.
It should move up and down during the searching of a lock, and then it
should stop at a certain value when lock is achieved.
Bye
Luca
iw2lje

Il martedì 22 marzo 2016, Wayne (gmail) <wayne.holder at gmail.com> ha scritto:

> 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 <kb8tq at n1k.org <javascript:;>>
> 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.holder at gmail.com
> <javascript:;>> 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 at febo.com <javascript:;>
> >> 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 at febo.com <javascript:;>
> > 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 at febo.com <javascript:;>
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>