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

On 3/23/2016 11:45 AM, Burt I. Weiner wrote: > Would someone please tell me what "BITE" signal is. > > Thanks, > > Burt, K6OQK > > >Hi > > > >Which strongly suggests that the BITE line is telling the truth. The > unit is > not in lock BITE = Built In Test Equipment It's used to describe internal

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

Would someone please tell me what "BITE" signal is. Thanks, Burt, K6OQK >Hi > >Which strongly suggests that the BITE line is telling the truth. The unit is not in lock >and it's broke. If you have the gear, you can verify this by running the tune input up and >down and seeing if the output

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

Wayne, I suggest another test too, but this requires a bit of luck. Power up the unit, and wait until it warms up, say 5 minutes. The VCXO voltage will stuck at 14.5V. Then power down the unit in order to restart the sweep cycle, just enough, say one second, then power up. If you are lucky and

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

Hi Which strongly suggests that the BITE line is telling the truth. The unit is not in lock and it’s broke. If you have the gear, you can verify this by running the tune input up and down and seeing if the output varies by about 0.02 Hz or not. Bob > On Mar 22, 2016, at 11:36 PM, Wayne

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

Hey Wayne, I said "you should read more than 1 Mohm", but if R215 is interrupted, of course. Antonio ___ 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

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

>From: Hal Murray > >iovane wrote: >> are you sure your LPRO actually locks? You say you have measured 10.000 MHz >> but you don't mention the other decimals. Some years ago I characterized >> some LPROs of mine, and from my notebook I take that, on one sample for >>

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

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) 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

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

I don't currently have a way to accurately measure the frequency of the output, but my assumption is that oscillator is running, but not locked. I did some more poking around and found that the crystal volts monitor (pin 9) starts low (around 4 volts) and then slowly rises as the unit runs. It

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

Perfect !! The swept voltage should not reach 14V, but only about 12.5V and then reverse. Your upper comparator is faulty. Check resistor R215 on the PCB bottom face, 100K SMD. You could chech it on board, and probably you will read more than 1 Mohm. I bet the trouble is there. R215 is near the

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

There's a plot of the unlocked sweep of an FE-5690 at the bottom of http://febo.com/pages/oscillators/rubes/ I think the LPRO is pretty similar. John On 3/22/2016 2:02 PM, Hal Murray wrote: time-nuts@febo.com said: are you sure your LPRO actually locks? You say you have measured 10.000 MHz

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

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)

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

time-nuts@febo.com said: > are you sure your LPRO actually locks? You say you have measured 10.000 MHz > but you don't mention the other decimals. Some years ago I characterized > some LPROs of mine, and from my notebook I take that, on one sample for > instance, prior to lock the frequency

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

Try iy with a pull-up. I have seen LPROs with an open collector type of output. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and

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

Wayne, are you sure your LPRO actually locks? You say you have measured 10.000 MHz but you don't mention the other decimals. Some years ago I characterized some LPROs of mine, and from my notebook I take that, on one sample for instance, prior to lock the frequency swept up and down between

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

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 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

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

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

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

>Da: Tom Miller > >- Original Message - >From: "Wayne Holder" > > >>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

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

- Original Message - From: "Wayne Holder" <wayne.hol...@gmail.com> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Monday, March 21, 2016 9:42 PM Subject: [time-nuts] LPRO-101 BITE (~lock) Signal Always Low I ha

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

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