[time-nuts] FE5680A Calibration

[Chris Stake]

Hi Bob,
Thanks for pointing-out the noisy output of the FE5680A. I'll probably try
to lock a crystal oscillator to it.
Unfortunately I don't have a suitable counter.
I was hoping I could use some sort of higher frequency standard but I
confess I had not really grasped the fact that the unit may well be within
millihertz of the nominal frequency: too delicate to twiddle with anything
other than precision equipment and long timebases.
Kind regards
Chris

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Bob Camp
> Sent: 14 March 2012 16:57
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] FE5680A Calibration
> 
> Hi
> 
> Do you have a dual channel counter that you can put the GPS into on the
> "start" and the FE into as the "stop"? The HP 5334, 5335, and 5345 are all
> examples of this sort of counter.
> 
> Bob
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Chris Stake
> Sent: Wednesday, March 14, 2012 12:49 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] FE5680A Calibration
> 
> Nice idea,
> But I haven't got a DSO and the persistence of my scope isn't good enough
> to
> view 10Mhz sampled at 1pps.
> Chris
> 
> > -----Original Message-----
> > From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> > Behalf Of EB4APL
> > Sent: 14 March 2012 15:46
> > To: time-nuts at febo.com
> > Subject: Re: [time-nuts] FE5680A Calibration
> >
> > My fast approach would be to trigger a scope with the 1 PPS from the GPS
> > receiver and observe the how the 10 MHz output of your Rb drifts.  1
> > full cycle per second is 1 e-7 so you'll need to use an stopwatch to
> > time long periods when you are fine adjusting .
> > Building (or buying) a GPSDO allows yo to make the comparison between
> > both 10 MHz outputs without the jitter in the GPS receiver 1 PPS.
> > Probably others in this list can suggest more elaborated and convenient
> > approaches to this.
> >
> > On 14/03/2012 16:17, Chris Stake wrote:
> > > Hello all,
> > >
> > > I purchased a FE5680A from a Chinese  Ebay vendor. I have connected it
> > to a
> > > 16.5V laptop supply, added 7805-based 5V rail and a PMOS Fet switch to
> > drive
> > > a LED for the "locked" signal. I can communicate with it using the
> > excellent
> > > Fe5680Calibrator software. As received the frequency offset is set to
> > Zero
> > > and the unit seems to work well.
> > >
> > > I plan to put it into service as a workshop frequency reference and so
> > would
> > > like to set it close to 10.0Mhz. I have various oscillator modules,
> > signal
> > > generators, SDR receivers, GPS receivers, a scanner, some uncalibrated
> > > test-gear. I live in a river valley in North Devon UK so radio
> reception
> > is
> > > a bit restricted but I receive digital television via a masthead
> > amplifier
> > > and long downlead.
> > >
> > > Could someone please suggest a way of going about this?
> > >
> > >
> > >
> > > Regards
> > >
> > > Chris Stake
> > >
> > >
> > >
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