Nice! I didn't know that. But what a number, 300... Why such a digital-hostile factor? Why not 256 or 512?
Volker Am 24.01.2014 20:51, schrieb tmil...@skylinenet.net: > 9.8304 MHz divided by 300 is 32,768 Hz. > Feed that to an electronic clock and you will have an atomic clock of sorts. > > Regards > > > > > Thomas Miller, > Director of Wireless Services > Skyline Network Engineering, LLC > 443-250-6381 > ________________________________________ > From: time-nuts-boun...@febo.com <time-nuts-boun...@febo.com> on behalf of > EB4APL <eb4...@cembreros.jazztel.es> > Sent: Friday, January 24, 2014 2:27 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Nortel GPSDO osc age alarm > > Volker, > > I have also a Trimble Nortel NTG550AA and fortunately it works very well > from the beginning. I have a downloaded manual and some other info that > I can send you if interested. > And one word of caution: if you observe the cable that goes from the > main board to the small interface board, you will see that one of the > connectors is reversed so be careful if you make a custom one for your > cabinet, do it in the same fashion. Using a normal cable produces > bizarre results that can actually drive you nuts, don't ask how I know. > The coax connector, J5 is a 9.8304 MHz output, an odd frequency used by > the cell tower equipment, J4 carries 1/2 PPS (even seconds), the next > one (J1) is the for the antenna and J4 is the 10 MHz output. You already > know that but I want to note that the 9.8304 frequency has mislead some > users to think that it was the 10 MHz output, not your case. > > The seller (Bob Mokia , fluke.l) is well known to the Time Nuts, he has > a technical background and normally known quite well what he sells and > is very positive about solving the problems that may arise, his only > problem is that his English is worse than mine . I think that he > regularly monitors this list. > > I have observed a strange thing on this offering, at the end of the page > he says: > > "power on it ... > > after 30 minutes/it will locked/10mhz come on the SMB connector > > 1pps on the back d sub connector " > > I never heard of a 1PPS signal on these units, only 1/2 PPS on the J4 > coax and I had asked on this list if anybody had found how to extract 1 > PPS from the unit. I have to put a scope on the DSR pin because it is > the only connected to the main board other than TxD and RxD. Could you > verify this on your unit when you change the OCXO and get it running? > > Best regards, > Ignacio EB4APL > > > On 24/01/2014 16:23, Volker Esper wrote: >> ...thanks, Bob, it seems to be the oscillator, that is at it's limit, it >> cannot tune to 10 MHz at full EFC voltage, see new thread (started by Mark). >> >> Volker >> >> Am 24.01.2014 01:09, schrieb Bob Camp: >>> Hi >>> >>> That’s a cell phone base station board. It’s got a bunch of outputs, some >>> of which are related to the cell network it was built for rather than >>> 10MHz. I’d bet your 9.8 MHz output is one of those. They are DDS based so >>> there likely is some range of possible outputs. >>> >>> The age alarm is not unusual on a newly powered up board. It’s moving >>> faster than it should. It may settle down. >>> >>> The DAC at limit is not a real good sign …. >>> >>> Bob >>> >>> On Jan 23, 2014, at 6:43 PM, Volker Esper <ail...@t-online.de> wrote: >>> >>>> Hi! >>>> >>>> I bought a Trimble/Nortel GPSDO >>>> >>>> http://www.ebay.de/itm/300933951405?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2648 >>>> >>>> and Lady Heather's now tells me that everything is alright - except >>>> - DAC 6.000004V >>>> - OSC BAD >>>> - osc age alarm >>>> >>>> The rectangle "10MHz" output signal (J5) shows a signal at about 9.8MHz >>>> (a deviation of about 200kHz), wobbling 4Hz up and down. Oddly enough, >>>> the direct oscillator output (J4) shows a sine wave at a stable >>>> 10.0000004MHz (a deviation of 0.4Hz). >>>> >>>> It seems to me it's not the oscillator that is bad but the servo loop - >>>> what can I do? >>>> >>>> Thank you >>>> >>>> Volker >>>> _______________________________________________ >>>> 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. > > ________________________________ > CONFIDENTIALITY NOTICE: The information contained in this electronic message > is confidential information intended for the use of the individual or entity > named above. 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