I like your idea of keeping the existing low phase noise Oscillator
and measure the drift and correct in the software. The whole thing
could be quite cheap yet give you good results. Like you mentioned
using a small CPU running off a GPS calibrated clock to measure the
Oscillator output, multiple readings and average it out. This entails
a minimum change to the radio, the software changes would be very
small, adding an offset to the frequency of the DDS, a little bit of
code to read the calibration offset from the measuring CPU.
Basically a Huff and Puff using software to do the actual correction.
At 11:04 AM 11/23/2005, you wrote:
Hi Jim,
Which is precisly why I like the idea of measuring the offset and
compensating in other ways, rather than steering the oscillator
itself. Then, you can work on getting the best possible performance from
the oscillator, which can be highly isolated from the outside world.
>- Jeff, WA6AHL
Jim, W6RMK
_______________________________________________
FlexRadio mailing list
FlexRadio@flex-radio.biz
http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
Cecil Bayona
KD5NWA
www.qrpradio.com
"I fail to see why doing the same thing over and over and getting the
same results every time is insanity: I've almost proved it isn't;
only a few more tests now and I'm sure results will differ this time ... "
