[evlatests] 3-bit DTS module from 12

[Mike Revnell]

The 3-bit DTS module was brought back from the site and has been 
repaired. Solder joints are a big deal at microwave frequencies.

While I had the module in the lab I took the opportunity to make a 
measurement I had thought of to check for any "common mode" noise that 
the cross power measurements I made would be insensitive to. The outcome 
is that the peak to peak jitter from all noise sources including the 
module the antique synthesizer I have on the bench and the reference 
system generating the clock signals is about 0.01 turn at 4 GHz. This is 
significantly worse than the spec of the digitizer chip but represents 
all sources in the system so is somewhat pessimistic.

Mike.