Hi
Isolation in a carefully managed test setup can be done (with enough money to
spend). Isolation it the real
world with grounds and cables running here and there is likely to be a
challenge. At least that’s been the case
on the few dozen of these systems I’ve designed and put into production
Getting great isolation at 10 MHz is the easy part, given enough
switching elements and control. One question is whether the switchover
needs to be transparent (glitchless), without adding or losing any clock
cycles, and ideally with no phase shift. This would involve a much more
sophisticated
Hi Bob,
Thanks for the quick reply, makes sense.
73
Scott
W7SLS
> On Jul 26, 2018, at 1:13 PM, Bob kb8tq 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
>
rom: time-nuts 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 re
On Thu, July 26, 2018 5:05 pm, Hal Murray wrote:
> Has anybody built a microprocessor controlled PLL to handle this case?
There are failover clock generators (integrated circuits), typically
marketed for use in telecom equipment where there is a requirement to
synchronize with a reference clock
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 On Behalf Of W7SLS
Sent: Thursday, July 26, 2018 1:46 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] 10
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 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
kb...@n1k.org said:
> One interesting subtlety making something like this:
> What if the two inputs arenât 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 âswitchâ you get a 1 Hz offset spur that is 60 db
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
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
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 $$$
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