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

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charly724:
Hello,
I've received also the little PLL-GPSDO. My version comes with BG7TBL marked outside and works very well.



Regards
Charly

charly724:
Hello,
some testing results :-+:
- sine wave output (50Ohm) = 1.2Vpp; 0.424 Vrms or 5.55dBm
- DC input current at 12V = 260mA reduced to 120mA after 2 minutes
- frequency accuracy is higher than my measuring accuracy
- RS232 works well with Lady Heather







Regards
Charly

jpb:

--- Quote from: charly724 on February 24, 2018, 09:34:41 am ---- frequency accuracy is higher than my measuring accuracy

--- End quote ---
If you use the TF930's computer interface  then you can extend the gate time to get more precision though with longer gate times the two GPSDOs will agree with each other more anyway so you might not gain a lot. The counter keeps the counts going continuously so if there is a frequency difference and the phase difference reaches 20 nanosecs then the frequency value will change at that point and you could estimate how long it took for a 20nsec shift.

0xdeadbeef:
Did you guys get any kind of documentation for this thing?
Like what do the different LED states/blinking codes mean exactly and if the UART output is TTL level.
Or, well, maybe even some UART protocol information?

Gyro:
They're shown in this listing https://www.ebay.co.uk/itm/PLL-GPSDO-GPS-Tame-Disciplined-Clock-Sine-Wave-GPS-Receiver-10M-1PPS-RS232/162871058138?hash=item25ebdf1eda:g:nHkAAOSw1zhaas8s


--- Quote ---- PWR:power/GPS lock indicate,flash:GPS unlock;on:GPS lock;off:not power
- ALM:alarm led,on:frequency deviation accuary>0.1Hz,offï¼?frequency deviation accuary<=0.1Hz
- Rear panel:DC-IN:12V power inputï¼?5.5-2.1 socketï¼?inside is positive ,ouside is negative
- RS232:GPS NMEA output 9600BPS,compate RS232 signal
--- End quote ---

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