Hello all. Long time listener; first time caller. I picked up one of the BG7TBL GPSDO units from Ebay, and I am still waiting for it to arrive. I understand it has its flaws, but my needs are fairly simple, and I think it will serve.
My intent is to use it as a reference which is better than the 0.1ppm TCXO in my HF radio, an ANAN-100D (HPSDR architecture); I would like a PPS reference so that I can experiment with timestamped IQ samples; and I would like to build an NTP server using a BeagleBone Black. I think this will serve to do these things even if it is not the ideal equipment. I have read I believe all of the previous discussion on this list over the past few months including the excellent study by John KE5FX, and I had a few questions to see if there had been any new developments. I understand some may have communicated with the designer as well. Does anyone else have further information on the serial interface? Is the NMEA data directly to/from the U-Blox module or does the internal firmware filter/augment it to allow monitoring or tuning of other internal parameters - for instance can one set cable delay? What is its suitability for running as a GPS/PPS reference for an NTP server? Any other software suggestions for keeping an eye on it? Second, has the small frequency error identified by John been corrected, or is it a problem endemic to the design (I think maybe this was identified as a resolution limit of the DAC providing OCXO control voltage; could it be dithered?) As this is my first moderately accurate device in the shack, is my best approach just to put it on the shelf, leave it on for a long time, and trust it? I can see how its easy to begin the slide when there is only one clock to stare at skeptically. Thanks, John Laur K5IT _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
