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

Scott McGrath scmcgrath at gmail.com
Thu Jul 26 17:33:32 EDT 2018


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 <kb8tq at 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.scott at 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
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