Hi One interesting subtlety making something like this:
What if the two inputs aren’t quite on the same frequency? Purely as an example, say they are 1 Hz off from each other. If you have 60 db of isolation in your “switch” you get a 1 Hz offset spur that is 60 db down. Even something much further down is plenty to mess up the ADEV of the output. Bob > On Jul 26, 2018, at 4:33 PM, Scott McGrath <scmcgr...@gmail.com> wrote: > > Build one yourself, Detector diode on primary RF input when output drops > use a rf relay or PIN diode switch to fail over to backup standard. All > thats needed is a crossing detector and relay / switch driver > > Yes there would be a momentary hit but it would work. > > Content by Scott > Typos by Siri > > On Jul 26, 2018, at 4:13 PM, Bob kb8tq <kb...@n1k.org> wrote: > > Hi > > They are a pretty rare item. A more common approach is a disciplined > oscillator that > will do failover on it’s inputs. That’s still a rare item, but at least a > possible thing to find. > The equally big problem will be getting doc’s on one if you do find it…. > > Bob > >> On Jul 26, 2018, at 2:45 PM, W7SLS <w7sls.sc...@gmail.com> wrote: >> >> Hello, >> >> Looking for recommendation for a ‘failover’ or ‘redundant’ switch for 10 MHz >> distribution. >> >> Not really sure of the correct term. >> Something that sensed RF on primary 10 MHz, and then switched to secondary >> on fail of primary. >> >> A brief search showed several very nice $$$ items, suitable for commercial >> applications, >> but I wonder if there are some “last year’s” (but not last century) versions >> that would work for a home lab. >> >> Context: >> >> I have a GPSDO and a Rb source of 10 MHz. >> The power supply on the GPSDO failed (worked enough to light up the GPSDO, >> but not enough to lock). >> I have a new power supply on order, but would be nice to have “insurance”. >> >> Thanks in advance for the group bandwidth. >> >> Scott >> W7SLS >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
