[time-nuts] combining same frequency for redundancy

Claude Fender claude.ff at aliceadsl.fr
Wed Jun 4 14:46:15 EDT 2014


Quoting Tony Greene <tonygreen924 at inbox.com>:

> About 50 years ago I ran into a Frequency Division Multiplexer that used a
> redundant master frequency system.  I beleive they combined the same
> frequency for the master oscillator, but it was something  like a special
> hybrid combiner.  I remember that they used a phase angle of 135 degrees -
> and then if they lost one signal, the power went down by 3 db on the main
> pilot.  Anybody no any details on this type of system ?
>
> What I am looking for is to have an input to a distribution amplifier where I
> can connect and disconnect two different inputs and keep the output systems
> up and running.
>

It seems that the HP 58502A distribution has this feature :
>From the documentation :

The controller block input select line state (at power on from the
factory) selects input A over B, if valid signals are present at both
connectors, but will switch to input B automatically, if the signal at
input A fails. If input B fails and input A signal reappears, the
controller block will select input A again as the valid input signal
source. If both inputs fail, no select line state change will occur.

Claude.

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