[time-nuts] Portable standard - Rb query

[paul swed]

Quick?
How much do you want to pay? $1500 perhaps.

On Wed, Apr 6, 2011 at 3:47 PM, Joseph Gray <jgray at zianet.com> wrote:

> Murray,
>
> Do you have any details on the DDS? How difficult is it to change on
> the fly if I wanted to?
>
> Is the FE-5680A that you like +15V only?
>
> Joe Gray
> W5JG
>
>
> On Wed, Apr 6, 2011 at 12:34 PM, Murray Greenman
> <Murray.Greenman at rakon.com> wrote:
> > Joe,
> > I have several of the FEI units. You pay more for these, because
> > (assuming you get the right one) they have a DDS synthesizer included,
> > which (with suitable modification) allows them to operate from about
> > 1kHz to 15MHz in 10mHz steps. Some models require +15V and +5V, others
> > just +15V. My preferred unit is the FE-5680A. I have mine mounted on a
> > large aluminium plate and powered by a switch-mode computer supply. I
> > have set the default frequency to 10MHz.
> >
> > The LPRO type are fine if you want a simple fixed 10MHz reference, and
> > are in general cheaper and use less power.
> >
> > As for lifetime, they seem to go forever. That said, there's no need to
> > power them continuously since (in my experience) they are close to their
> > final frequency 5 minutes from a cold start. Power consumption is higher
> > than an OCXO, but they really do make a great portable standard. That's
> > what I'd use (in fact, that's what I do use).
> >
> > Murray
> >
> >
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