Does anyone on the list have any specs or manuals for the Spectracom 8140 distribution amplifiers? While I'd like schematics, I'm particularly interested in how many of them you can put in a single chain.
For those who aren't familiar, these are part of a frequency distribution system where there is a master coax line that carries 10MHz on top of 12VDC. You attach multiple 8140T boxes along this line (with BNC tees) and each one provides a single output, usually a sinewave but there were versions that did frequency conversion, output a square wave, etc. There was also a multiple version (8140M I think) that provides three square wave outputs and can be externally powered. These make a nice way to route signals around the lab. They were designed to work with a box (just plain 8140, I think) that took a single input and could drive up to 4 strings of amps. Also, my 8164 WWVB-disciplined oscillator has an option installed that put 12 volts on its outputs. Right now, I'm driving it from my slightly modified HP 5065A Rb standard; I tapped the signal off before the divide-by-2 (later model 5061As and 5065As used a 10811A oscillator followed by a divider to maintain a 5MHz output) and used a mini-version of the TADD-1 amplifier with an injector circuit to put 12 volts on the output. The original 5MHz is still available and doesn't seem to be affected. Anyway, I'm just wondering how many of these amps I can string together; right now I have 8 and it seems to work OK but I'm not sure if I'm stretching things. Thanks, John _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts