John, Perhaps it is there and I did not see it, but do you have a schematic of the connections to the Trimble oscillator to go along with the picture?
Thanks, Joe -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of John Miles Sent: Thursday, April 21, 2011 10:23 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Fix Trimble Oscillator?? Hi, Bill / Chuck -- I can confirm that the whole oscillator including oven runs on 12 volts. However, you do have to connect two different pins to +12 and two different pins to ground to make it work (see attached). Current drain should be in the 500 mA neighborhood for the first couple of minutes. The Trimble-labelled OCXOs are superb parts, well worth repairing if the only problem is a bad oven controller. I removed and measured the oscillators from two Thunderbolts chosen at random, and they're in the same ballpark as a premium-grade Wenzel ULN. -- john, KE5FX > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]On > Behalf Of WB6BNQ > Sent: Thursday, April 21, 2011 7:20 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Fix Trimble Oscillator?? > > > Hi Chuck, > > Refer to the following web site to see what another list member did in > using an off board oscillator with a Trimble that had a not so good > oscillator in it. > > http://www.thegleam.com/ke5fx/tbolt.htm > > You may want to back up to his main page and peruse some of his other > pages. > > 73....Bill....WB6BNQ > > > Chuck Forsberg WA7KGX N2469R wrote: > > > The 12 volt current is 76 milliamps starting or running. > > I increased the voltage slightly and the temp rose to 32 deg C. The > > frequency offset gets down to about 50 Hz. Looks like the oven wants > > 18 or 24 volts. > > > > So .... has anyone disassembled one of these ovens > > and made repairs? > > > > On 04/21/2011 07:37 AM, jmfranke wrote: > > > A precision oscillator that far off usually indicates the oven is > > > malfunctioning. > > > > > > John WA4WDL > > > > > > -------------------------------------------------- > > > From: "Chuck Forsberg WA7KGX N2469R" <c...@omen.com> > > > Sent: Thursday, April 21, 2011 10:31 AM > > > To: "time-nuts" <time-nuts@febo.com> > > > Subject: [time-nuts] Fix Trimble Oscillator?? > > > > > >> Is it possible to open up the Trimble oscillator module and > > >> adjust its frequency? It is off by 60 to 120 Hz, too far for the > > >> DAC voltage to pull it in. > > >> > > >> -- > > >> Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com > > >> Developer of Industrial ZMODEM(Tm) for Embedded Applications > > >> Omen Technology Inc "The High Reliability Software" > > >> 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 > > >> > > >> > > >> _______________________________________________ > > >> 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. > > > > > > > -- > > Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com > > Developer of Industrial ZMODEM(Tm) for Embedded Applications > > Omen Technology Inc "The High Reliability Software" > > 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 > > > > _______________________________________________ > > 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.
