On 04/06/2011 10:03 AM, WB6BNQ wrote:
Joe,
Before you worry about batteries and such, you first need to ask what it is that
you are trying to accomplish.
For instance, if you did not need the really close in low phase noise and really
short term stability, then perhaps a Rubidium (Rb) oscillator would suit your
needs. the Rb has better longer term stability than a crystal oscillator and
can
be left off until it is needed saving on battery requirements. A decent Rb
would
be up to specs in about 20 minutes and would suffice for most applications as a
better general frequency reference for portable purposes.
A really high quality crystal oscillator isn't worth a damn unless it is kept
running constantly and without vibration. Any banging around is going to
invalidate it. The Rb, unless you beat it with a hammer, does not suffer from
those problems. Obviously you would like to treat either item with care, but
things do happen and the Rb would be more rugged the crystal oscillator.
I agree with Bill here. A rubidium is very good bang for the buck in
this respect. If you only want to do frequency transfer, then a rubidium
with a lockable multi-turn pot that you adjust at home against a GPS.
Another approach is to have a Thunderbolt and small patch antenna with
you. About the same money.
Only if you want to carry the phase with you and can't use GPS I would
say you would need batteries.
Cheers,
Magnus
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