[time-nuts] Thunderbolt? (re simple gpsdo.)

Azelio Boriani azelio.boriani at screen.it
Fri Dec 30 06:11:00 EST 2011


How can you tell that your GPSDO consistently beats the TBolt?

On Fri, Dec 30, 2011 at 5:58 AM, Mark Spencer <mspencer12345 at yahoo.ca>wrote:

> Yes that is correct.   I have one of the units made by James Miller G3RUH.
>   I had hoped to build some something along these lines on my own, but the
> Jupiter gps modules I acquired didn't actually have a 10 kHz output.   Also
> my comment re the adev is for the 10 MHz output.   I've never looked at the
> one pps output.
>
>
> Sent from my iPad
>
> On 2011-12-29, at 8:45 PM, "Richard W. Solomon" <w1ksz at earthlink.net>
> wrote:
>
> > I think you are talking about the G3RUH/N1JEZ design. I have built three
> of them
> > and they work very well.
> >
> > 73 es HNY, Dick, W1KSZ
> >
> >
> > -----Original Message-----
> >> From: Mark Spencer <mspencer12345 at yahoo.ca>
> >> Sent: Dec 29, 2011 9:24 PM
> >> To: Discussion of precise time and frequency measurement <
> time-nuts at febo.com>
> >> Subject: Re: [time-nuts] Thunderbolt? (re simple gpsdo.)
> >>
> >> One of the designs using the 10 kHz output from a Jupiter gps engine
> and a simple PLL to discipline an ocxo might be good starting point if
> suitable gps engines are still available.  There won't be much to tweak but
> the performance could be quite good.
> >>
> >> My first gpsdo was a manufactured version of this concept and it
> consistently beats my thunder bolt from an adev perspective and there is
> nothing to tweak (:
> >>
> >>
> >>
> >> Sent from my iPad
> >>
> >> On 2011-12-29, at 6:35 PM, Chris Albertson <albertson.chris at gmail.com>
> wrote:
> >>
> >>>> The era of cheap Thunderbolts appears to be history.
> >>>>
> >>>
> >>> What is the simplest GPSDO you can build?   There are many designs
> >>> around but when the T-Bolts came out I think people lost interesting
> >>> building.
> >>>
> >>> I think something very simple could work.  If your local oscillator is
> >>> at all decent it will not loose or gain full cycle in one second.  So
> >>> I think you only need to compare the phase of the oscillator and the
> >>> PPS.   Would an analog controller work?   I do software all day every
> >>> day at work so it would be fun to build an analog computer for a
> >>> change.
> >>>
> >>>
> >>> Chris Albertson
> >>> Redondo Beach, California
> >>>
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