[time-nuts] Spectracom 8140T distribution amps

Brooke Clarke brooke at pacific.net
Sat Apr 22 17:51:08 UTC 2006


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

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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
>
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