Quoting Tony Greene <[email protected]>: > 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. > ____________________________________________________________ > FREE ONLINE PHOTOSHARING - Share your photos online with your friends and > family! > Visit http://www.inbox.com/photosharing to find out more! > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
