In a message dated 14/09/2010 04:11:27 GMT Daylight Time, nigel@ngunn.net writes:

Remember that "less than a buck" crystals are mass produced, often to relatively loose tolerances and poor temperature stability, and is unlikely to match your oscillator configuration.

A properly cut crystal to your specification will probably cost you 30-40 bucks. My choice of supplier is http://www.quartslab.co.uk/ Don't forget to specify the oscillator configuration and component values if they don't know your particular downconverter model.

If you have no luck with the sub one buck crystal. I have a small number of made to order crystals for the Drake converter. Reduced height compared to the HC49U and 20pF to match the Drake oscillator.

However, I believe you can run the Cal Amp with the original crystal. This gives an output somewhere around 123MHz. The original xtal will be a decent spec and 123MHz is good as most unmodified transceivers will not transmit into your converter.

Thanks

David G0MRF