[time-nuts] GPSDO advice on BG7TBL DO

[Bill Notfaded]

Wes-

A great resource for info is the BG7TBL master thread at eevblog.  We track
everything we know about these units to compare them:
https://www.eevblog.com/forum/testgear/bg7tbl-gpsdo-master-reference/

Bill

On Sun, May 3, 2020, 6:14 AM Wes <wes at triconet.org> wrote:

> The seller and the PO did a yeoman job and the device arrived at 1 PM this
> afternoon.
>
> It turns out to be a date code 2019-08-03 instead of the pictured 2018
> unit.  A
> pleasant surprise, but not the latest which is (I think) 2019-10-20.
>
> This one still says, "GPS Disciplined Oscillator", the newer one says,
> "GNSS
> Disciplined Oscillator."
>
> The OCXO is a CTS, labeled "970-2178-46". The receiver is unlabeled.
>
> I powered it up and it indicated lock in about 10 minutes using the
> supplied
> puck antenna on the workbench inside the house (concrete exterior
> walls.)    For
> comparison, the TAPR Kit M12+ Oncore receiver located a couple feet away
> with a
> similar antenna situation shows lock on only three satellites using LH)
> That
> said, the only way I have to evaluate it is with the BG7TBL FA-2 counter
> with a
> Bodnar reference that has been running for weeks.  It's continued to drift
> for
> over two hours and now has approached 10 MHz but is still wandering around
> 4-5
> mHz with respect to the Bodnar.  Which is correct is anyone's guess.
>
> I guess the next project should be to get the external antenna mounted and
> splitter installed so everything is using the same source.
>
> Wes
>
>
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