[time-nuts] Chinese GPSDO 10 MHz error

[Tim Shoppa]

Full KE5FX evaluation of BG7TBL GPSDO here: http://www.ke5fx.com/gpscomp.htm

I'm wondering out loud if it might, like many hobbyist GPSDO's, be
frequency-locked rather than phase-locked and thus susceptible to
last-digit-counter bobble in some long-averaging counter.

Tim N3QE

On Wed, Aug 26, 2015 at 3:18 PM, Perry Sandeen via time-nuts <
time-nuts at febo.com> wrote:

> Hi,
>
>
>
> On the EEVBLOG  (http://www.eevblog.com/forum/index.php)
>
>
>
> They mention that the "2014-11-06"version GPSDO that was “most extensively
> tested, so far (by ke5x and others).
>
>
>
> (Has a) known bug, outputfrequency is not exactly 10mhz (9,999,999.999,800
> Hz). This translates to ~2hzerror at 100ghz.”
>
>
>
> A question is if this bug isjust for this particular model or all other
> versions suspect?
>
>
>
> I realize that in and of itsself it is very small error, but errors tend
> to multiply or cause incorrectconclusions to testing.
>
>
>
> Another question is will the LHdisplay unit they offer work with other
> Trimble units such as are offered byRDR?
>
>
>
> That said, these models seem tobe a very nice turn-key systems.
>
>
>
> Regards,
>
>
>
> Perrier
>
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