Unknown GPSDO but BG7TBL logo on the circuit board and OCXO !

[rfclown]

Its inverted to be "RS232" instead of UART

+1
Works straight with an off-the-shelf (DB9F) RS232->USB converter (at least with the "original" units). ...

I never would have thought of that since RS232 is +/- voltage.

[Echo88]

Having bought the same GPSDO im interested if someone could maybe do a Allan Deviation measurement of this GPSDO against a good OCXO/Rubidium?
I did it against a MV89A used as an external reference for my FCA 3100 counter, measuring the GPSDO on channel A, using Time Lab.
The results are unsatisfactory (gotta look it up on my PC once i get home, but i think it was about ~5xE-11 at 10s and 100s) compared to any other GPSDOs ive seen here: http://www.ke5fx.com/gpscomp.htm
I assume the OCXO is just too mediocre and letting it settle at power for a few days wont really change the measurement results?

[BillyO]

I just got one of these the other day.

Seems a little different than other in this thread.  Has a 2022 date.  This one has a large CTI 12V OCXO, but it can also take the smaller square one too.  I'm guessing the OCXO and the Ublox NEO-7M are surplus/recovered items as the price of them new would be more than the $90 or so I paid for this.

Works well.