piclist 2000\05\23\052541a >
Thread: [EE] Phase locking DRO's
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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
better.
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

PavelK

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