Hi John: eBay auction 7605840019 says up to 25 boxes on the master coax. But I suspect it's a function of the power supply in the main box.
73, Brooke Clarke -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com John Ackermann N8UR wrote: >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 > > > > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts