piclist 2000\05\23\052541a >
Thread: [EE] Phase locking DRO's
face BY : Pavel Korensky email (remove spam text)

At 01:04 23.5.2000 -0600, you wrote:
>That is one option we are exploring. There is a nice design
>(PIC based) that Brook Shera has put together to use the 1 PPS out of a

I made it (with small modification - Lattice PLD chip instead the LSI
logic) and it works really good. I am using it as a master timebase
reference for my various instruments.

But oscillator is a real problem. I tried couple of TCXOs and results was
not good. Finally I bought the OCXO (expensive) and results are much much
Currently, I am trying to make my own OCXO as a hobby project.

>The plan is to come up with methods that amateurs can duplicate for
>themselves without too much effort. Things like building your own
>TCXO's with a 12Cxxx part as controller.

Look at http://www.karlquist.com  - Rick Karlquist was developping OCXOs for
Hewlett-Packard and he knows a lot about the whole problem. On his pages,
there is a very nice and detailed design of ultra high precision OCXO
(which I am trying to duplicate at home). The whole design is patented, but
I got the permission from Rick to use the design for non-profit projects
(because HP is not currently actively using this patent in any design).

The whole oscillator is a bit complex to make (you need lathe and mill),
but the result should be perfect. BTW, he is using PIC16C73 for the PID
control of the oven temperature.

Best regards


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Subject (change) [EE] Phase locking DRO's

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