[time-nuts] FE5680A Calibration

[Bob Camp]

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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