[time-nuts] 10 MHz 'failover' switch?

Scott McGrath scmcgrath at gmail.com
Thu Jul 26 18:40:30 EDT 2018


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.vanhorn at 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-bounces at lists.febo.com> On Behalf Of W7SLS
Sent: Thursday, July 26, 2018 1:46 PM
To: time-nuts at 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
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