[time-nuts] Early Christmas - DMTD up and running

[cdelect at juno.com]

Skip,

Nice! Now you can go down another rabbit hole!!!

Nothing fancy is needed for noise floor DMTD tests!

Here is a PIX of what I use.
- A passive SMA power splitter 
- a couple short SMA cables
- an assortment of sma M to SMA F adaptors (elbows work nice)
- A variable phase shifter from an HP 8405A (You can manage without it!)

Feed a good oscillator into the passive power splitter.
Connect the two outputs to the inputs of the DMTD unit.
Observe the count from your counter:
-If it's near full scale switch the start and stop cables 
at the counter and or switch the RF input cables.

Once you have a count that is in the low end of the count
insert a very short cable or SMA connector into one or the other
RF input channel of the dual mixer.
Inserting the short delay into one of the channels will cause
the count to drop.
Continue adding small delays to that channel until the count
underflows to the full scale region.
Then remove the last delay added.
Then make sure all SMA junctions are tight!!!!
Now go ahead and take data to get your noise floor.
Take data for an hour and avoid drafts and movement around the 
system.

Cheers,

Corby
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