[time-nuts] Distribution Amp project

[Dave M]

While investigating recent threads on Distribution Amps, I ran across a DA 
project on Didier's web site at 
http://www.ko4bb.com/Timing/Distribution_Amp/ and 
http://www.ko4bb.com/ham_radio/Extron_3_80/.  Those pages describe using an 
Extron ADA 3 80 analog video distribution amp to distribute a 10 MHz 
frequency reference to lab instruments.  It seems to be a cheap, easy way to 
get a set of reference frequencies throughout a small lab.  I would be 
interested to hear about any further testing and characterization was done 
with that setup, such as noise, distortion, etc.

I have a couple of the Extron DAs to play with, and would like to use them 
if they will do the job.  I'm only looking for frequency distribution; not 
timing.   Frequencies of interest are: 10MHz, 5MHz and 1MHz.
I haven't been able to find schematics for the Extron DA, but according to 
the author's discussion, it seems to be very similar to the DA circuit 
schematics at http://www.ko4bb.com/~bruce/IsolationAmplifiers.html.  I 
haven't had time to reverse engineer the circuit in my Extron DA, but it 
surely would be nice to avoid it if possible.  Anyone have a schematic, or a 
source for it?

Also, looking for a source of low cost 1:1 and 2:1 Ethernet transformers. 
I've tried the local computer shops, but they don't seem to be interested in 
helping.

Dave M