I do not have a LPRO nor a schematic but all Efratom units I have played with have identical loops. They also use the 1 uF capacitor for sweeping. Adding an other larger capacitor in parallel and the sweep slows down and you can observe 127 Hz behavior. Bert Kehren In a message dated 1/20/2013 3:18:58 P.M. Eastern Standard Time, [email protected] writes:
Hi Yes, unless you have some very unusual gear, it's tough to get a good view of the warmup / lockup sweeps *and* the performance of the LPRO after it's locked. The main questions on the lockup sweep is going to be: 1) does it make it to / past the right frequency? 2) how soon after it does get there, does it lock up? 3) if it doesn't lock up, does it do something odd as it sweeps past the right frequency? Not terribly complex. Bob On Jan 20, 2013, at 9:33 AM, Magnus Danielson <[email protected]> wrote: > On 01/20/2013 04:08 AM, Bob Camp wrote: >> Hi >> >> I just watch them with a reasonable counter that will give me 0.1 ppm resolution. >> Since the sweep is fairly fast, you can't have an overly long gate time. The real >> thing you want to catch is the frequency at each end of the sweep. It waits there >> long enough that you don't have to go crazy to catch it. > > As I suspected. > > I would have to switch mode for fine-tuning anyway. > > Cheers, > Magnus > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
