D'oh! But is there a way I can run for let's say 200 pulses on the B channel and see the count on the A channel?
>________________________________ > From: Bob Camp <[email protected]> >To: Discussion of precise time and frequency measurement <[email protected]> >Sent: Tuesday, September 17, 2013 7:54 PM >Subject: Re: [time-nuts] My FE-5680A Came In Today > > >Hi > >For checking things like GPSDO's the pps is actually much more useful than the >10 MHz. Just do the count one to the other trick and you have a very good way >to test what's going on. In it's normal configuration it should tune to within >about 1 ppt of the proper frequency. That would be 10,000,000 Hz / >1,000,000,000,000 or 1 ns every thousand seconds on the pps. > >Bob > >On Sep 17, 2013, at 8:37 PM, Bob Stewart <[email protected]> wrote: > >> Hi, >> >> I'm just looking for an accurate standard for my GSPDO PLL coding. As it >> is, I've been depending on others who have these to tell me the code works. >> I understand that when these are retuned to 10MHz, they're .005Hz off due to >> the DDS. I'm good with that. =) >> >> Bob >> >> >> >> >> >>> ________________________________ >>> From: Bob Camp <[email protected]> >>> To: Discussion of precise time and frequency measurement >>> <[email protected]> >>> Sent: Tuesday, September 17, 2013 7:30 PM >>> Subject: Re: [time-nuts] My FE-5680A Came In Today >>> >>> >>> Hi >>> >>> Keep in mind that these things make a pretty awful 10 MHz standard. They >>> are spur monsters in a big way. They won't drive your counter nuts, but for >>> anything that wants signal purity - watch out. >>> >>> Bob >>> >>> On Sep 17, 2013, at 8:14 PM, Bob Stewart <[email protected]> wrote: >>> >>>> Hi Bob, >>>> >>>> Yeah, I figured that retuning it would lose the 1PPS. No biggie. There >>>> are a number of those little connectors in this device, and the two that >>>> have cables connected use a flat 90 degree connector with a coax that's a >>>> bit smaller than RG-174. I just want to snap a pigtail on it and lead it >>>> out through a notch in the cover where the DB-9 connector is. There are >>>> several examples on the web where people solder wires to the connector and >>>> to the RS-232 header. I'd just as soon avoid soldering wires if I can. >>>> >>>> Bob >>>> >>>> >>>> >>>> >>>> >>>>> ________________________________ >>>>> From: Bob Camp <[email protected]> >>>>> To: Discussion of precise time and frequency measurement >>>>> <[email protected]> >>>>> Sent: Tuesday, September 17, 2013 7:06 PM >>>>> Subject: Re: [time-nuts] My FE-5680A Came In Today >>>>> >>>>> >>>>> Hi >>>>> >>>>> If you retune it, you probably will throw off the pps. The pps drive >>>>> strength is a bit weak, so you need to be careful looking for it. On some >>>>> units there is a software command to enable / disable it (as in pps only >>>>> when warmed up and locked - like a gps). The can / cover on the unit is >>>>> mu metal (Rb's are mag sensitive). If you drill a hole in it, you are >>>>> likely to impact it's mag shielding properties. >>>>> >>>>> Bob >>>>> >>>>> >>>>> On Sep 17, 2013, at 6:21 PM, Bob Stewart <[email protected]> wrote: >>>>> >>>>>> My FE-5680A Rb standard came in today. After the usual inspections etc, >>>>>> I fired it up and I have the purple haze. The native output is >>>>>> 8.38860798/9 (last digit jitter) as read on my 5335A using my GPSDO as >>>>>> an external standard. I've got a ways to go before it's all setup, but >>>>>> this is looking good. Does it warmup and change frequency at all, or >>>>>> can I retune it to 10MHz and use it as a reference without any further >>>>>> ado? >>>>>> >>>>>> Can someone tell me what type of socket that is where you tap off the >>>>>> RF? It looks sort of like a uFL connector, but a bit bigger. I'd >>>>>> rather avoid hacking and soldering on this if I can. >>>>>> >>>>>> Bob - AE6RV >>>>>> _______________________________________________ >>>>>> 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. >>> >>> _______________________________________________ >>> 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. > > > _______________________________________________ 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.
