[time-nuts] Fix Trimble Oscillator??

[John Miles]

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-bounces at febo.com [mailto:time-nuts-bounces at 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" <caf at omen.com>
> > > Sent: Thursday, April 21, 2011 10:31 AM
> > > To: "time-nuts" <time-nuts at 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     caf at 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 at febo.com
> > >> To unsubscribe, go to
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> > >> and follow the instructions there.
> > >>
> > >
> > >
> > > _______________________________________________
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> > >
> >
> > --
> > Chuck Forsberg WA7KGX N2469R     caf at 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 at febo.com
> > To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.


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