Hi 90 db will not drive the ADEV nuts, but it still will be a lot worse than a normal standard will deliver, even at 120 db down, if the offset is a bit above 1 Hz you will still see it in an ADEV plot.
Bob > On Jul 26, 2018, at 5:40 PM, Scott McGrath <scmcgr...@gmail.com> wrote: > > True but if you use a good switch or PIN 90 db of isolation is easily > achievable. Yes the spur is still there but it’s 90 down and will not > affect ADEV as badly. > > You could drive it further down with two switches with the alternate standard > connected to 1 port and a termination to the other. So a switchover would > switch to the alternate port and the backup path would switch from > termination to backup source. This would easily buy you 120-130 db > isolation assuming use of good cabling and proper routing, grounds etc > > After all this IS time-nuts after all > > Content by Scott > Typos by Siri > > On Jul 26, 2018, at 6:23 PM, Van Horn, David > <david.vanh...@backcountryaccess.com> wrote: > > Not quite what you are looking for, but I implemented a pair of thunderbolts > with no common parts (dual antennas power etc) into a simple RF switch. > The production manager flipped the switch on Mondays, and if either system > wasn't working I had a third system in a box ready to replace. > So for any failure of the two live systems, all he had to do was flip the > switch and call me. > > > -----Original Message----- > From: time-nuts <time-nuts-boun...@lists.febo.com> On Behalf Of W7SLS > Sent: Thursday, July 26, 2018 1:46 PM > To: time-nuts@lists.febo.com > Subject: [time-nuts] 10 MHz 'failover' switch? > > 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.
