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

[Bob kb8tq]

Hi

If you are feeding a frequency counter with the “10 MHz + spur” signal, it can indeed mess up the modern
computing counters. 

Bob

> On Jul 27, 2018, at 12:38 PM, Scott McGrath <scmcgrath at gmail.com> wrote:
> 
> Since this is time nuts ADEV is sacred, 
> 
> but the question is the use case.   
> 
> Are we looking at a time nuts level frequency distribution network. Or are we trying to lock benchtop instruments with poor internal standards to a common ‘Good’ reference.
> 
> If the former it can be done but will require a fair amount of design work as well as some EMC
> Modeling of the system to ensure no feed through of unwanted signals and/or modulation or beat products
> 
> If the latter simple detection and switching will be sufficient but dual switch much better.
> 
> Content by Scott
> Typos by Siri
> 
> On Jul 26, 2018, at 4:59 PM, W7SLS <w7sls.scott at gmail.com> wrote:
> 
> Hi Bob,
> 
> Thanks for the quick reply, makes sense.
> 
> 73
> Scott
> W7SLS
> 
>> On Jul 26, 2018, at 1:13 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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