[time-nuts] 10 MHz 'failover' switch?
Bob kb8tq
kb8tq at n1k.org
Thu Jul 26 21:45:19 UTC 2018
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 <scmcgrath at 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 <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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>
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