On 05/28/2012 12:08 AM, Michael Tharp wrote:
Greetings,
I've been pondering topologies for a custom GPSDO design and two obvious
choices seem to present themselves. The first, and seemingly more
popular by far, is to use a "pullable" oscillator as many OCXO and Rb
oscillators are and discipline it using a slow but precise DAC. But
unfortunately my Rb is not pullable so I would have to get another
oscillator. So I have a very stable but off-spec local oscillator, which
has to somehow be combined with the pulse-per-second from the GPS. If
there's a palatable analog way to do this, I'd love to hear, because it
would probably be simpler than the other idea.
How far off? What Rb do you have?
Most Rb:s not having a EFC input should be possible to modify for EFC in
one way or another, since the C-field needs to be applied regardless.
Cheers,
Magnus
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