[time-nuts] FE5680A Calibration

[Chris Stake]

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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