2 GPSDO's One Antenna No Smoke and, Crashing GPSDO's Against Rubidium

[@parkhillchristianacademyba6101]

FYI - on the GPS splitter, all of the Blocked Ports also have a 200 ohm resistor to Ground to simulate an Antenna. Some GPS receivers will throw a fault if they do not sense a current draw so we do that to alleviate any error messages. Sincerely, GPS Networking, Inc.

[@PapasDino]

I used to keep Z3801A GPSDO on 24/7 but the combination of heat from the 48VDC supply and the unit itself just added heat to the shack (not a bad thing in the winter!). I switched to a Rubidium several years ago since I can simply turn it on, wait until it's locked and it feeds all the gear at the ham bench; it's sufficient for that (not a Time Nut either!). 73 - Dino KLØS

[@andywlala]

I have just used a sat tv splitter for years. F connectors, one has a dc path, the others are all blocked. Don’t even bother to terminate the unused ports - 75ohm vs 50ohm, simply dont care. Since I am not a time nut (yet) - it has been good enough for my purposes.

[@ZenwizardStudios]

Glad to know this works I though about it but all the ones I had on had here did not handle the DC block. I would imagine that the GPSDO's would not care about the 75 Ohm as long as enough signal gets through to the receiver.

[@AllanMeredith]

I use a BG7TBL GPSDO which is very popular ( cheaper end of the scale). It would be good to see how it performs against the Rubidium.

[@ZenwizardStudios]

I will work on getting one ordered in to the lab. I am also kind of curious as to how it stacks up against the Samsung as well. as the Rb

[@andytwgss]

Same same. Really wonder how the BG7TBL PPL performs against other GPSDO (esp the Leo) and Rb.

[@SoddingaboutSi]

You might find some averaging on the scope would reduce that jitter.

[@ZenwizardStudios]

This was done with 32 averages over the course of about 8 hours, with 100% persistence. The parameter of interest was the long term frequency drift. This is caused by the oscillator steering to bring it back on frequency. ends up being about +/- 180ish micro Hz, centered on 10Mhz