[R-390] Rubidium Oscillator Questions

[Shoppa, Tim]

> All this accuracy is, of course, is to be able to measure frequencies and
> drift of my R390A’s precisely.  (BTW Dallas Lankford got his R390A BFO
> drift down to 1 Hz per hour.)

That last part is easy: using pretty much any old counter with a 1s or 10s
gate time, measure the rubidium oscillator as the standard, then the BFO
or other oscillator in the 390A.

It's a lot of overkill though. I find my 30+ year old HP5381A counter to
be stable to way better than 0.2PPM. Of course I find that by hooking
it to the 10MHz output of my Z3081A :-).

So I end up with multiple tiers: the really accurate GPS-locked OCXO
or Rubidium proves my HP5381A to be stable to better than 0.2PPM,
then I can use my HP5381A on the radios.

Tim N3QE.