Products > Test Equipment
Unknown GPSDO but BG7TBL logo on the circuit board and OCXO !
Ohm_My:
How is this unit wired for RS-232? The phono jack looks a little confusing to get it wired correct.
Hans_18T:
Can be either a mono or stereo jack (3.5mm)
Tip <-> 9 pin SUB-D pin 2
Ring <-> 9 pin sub-D pin 5
No issue seen so far on various computers, could be an "level" issue though on some computers as the interface provide only TTL levels.
texaspyro:
--- Quote from: Hans_18T on September 25, 2018, 07:23:30 pm ---Can be either a mono or stereo jack (3.5mm)
Tip <-> 9 pin SUB-D pin 2
Ring <-> 9 pin sub-D pin 5
No issue seen so far on various computers, could be an "level" issue though on some computers as the interface provide only TTL levels.
--- End quote ---
If it is TTL level, you may need to add inverters or a RS-232 driver chip that inverts the signal levels. Scope the TX line... if it is usually high (> 1V or so) you will need to invert the signals.
Electroalice:
Hi Purchase one of these units dated 2018-06-05. Compared the output to an XLI GPS. The 10 MHz is good but the 1 PPS has a constant jitter approx. 20ns. Every 1 second it shifts 3 ns then on the 6th second jumps back and repeats continuously.
Is this common to all units or is mine faulty?
Hans_18T:
I never looked at the 1PPS (except for its presence). As the the 10MHz is derived from the 1PPS and provides a stable 10 MHz I would say your device is fine.
See also https://www.eevblog.com/forum/chat/how-accurate-is-a-gps-1pps-signal/msg170798/#msg170798
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