[time-nuts] Portable standard - Rb query

[Joseph Gray]

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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