David >>> Eamon Skelton 03/03/2008 08:50 >>> David Hilton-Jones wrote: > Does anybody (preferably in the UK for P&P) have surplus to their requirements a stable oscillator producing a sine wave at 10, 20, 40 or 50MHz at 5-10dbm? > > Thanks > > David, G4YTL eBay is the best place to find OCXOs at a reasonable price.

I can't find any startup specs on my copy of the data sheet for the Isotemp OCXO134-10. (Maybe I missed it.) I'm not looking for the stability type warmup time of several minutes.

Even on a tiny netbook PC it will stream 8-bit logic samples at 10 MHz (24 max) with no dropouts into available memory (which on my netbook is usually over half a gigabyte, giving over 50 seconds of continuous capture).

The doubling was accomplished by wiring the LO and RF ports of an ASK-1 mixer in series and driving it with a very well filtered low distortion sine wave (important) at about 10 mW. The output filtering was just a ladder of parallel resonant tanks in shunt and series resonant tanks in series. The Q of the tanks was fairly low.

On 1/4/13 10:25 AM, Rick Karlquist wrote: > Chris Albertson wrote: > >> My question is about the phase noise of the final 16MHz signal. Do >> crystal filters "clean up" the signal.

The optimum size varies a bit, but between 10…14cm in diameter is about right. The ground plane does normally not need to connect to anything, it has to be conductive but not necessarily magnetic (aluminum foil is OK, too).

Most of the birds appeared between 10 a.m. and noon, after the morning's heavy overcast lifted, offering blue sky and cumulus clouds. Despite light NW winds from the start, the heavy overcast really suppressed the flight. During peak time the birds were high and the winds shifted to SW a bit before 11.

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With all the things that could go wrong in general (dead unit, worn-out discharge lamp, drifted sweeping boundaries of the oscillator etc.), the 1 pps to 10 MHz conversion for this particular model(!) seems fairly straight forward. In fact the only issue I've been facing so far is the one that I'm trying to resolve in this thread.

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