Re: LF: QRSS / UA land

[G0MRF@aol.com]

In a message dated 3/26/02 6:03:13 AM GMT Standard Time, DK8KW@compuserve.com writes:


> ... you could also look into some other solutions that should work pretty
> well. For example, there is a way to use two xtals that are 137.7 kHz
> apart. The frequencies of thos x-tals are mixed. If the two xtals have
> approximately the same temperature behaviour, the resulting frequency is
> very stabile. You find a possible sulution on the homepage of Peter, DF3LP
> at


If all else fails I have a stock of  8.000 and 8.274MHz Xtals.
They mix to give 274kHz and then you can divide by two which produces two antiphase signals at 137kHz suitable for a push pull amplifier.

The circuit is shown as part of a 300W transmitter in the RSGB LF source book and at www.g0mrf.freeserve.co.uk

As a word of encouragement to Alex. I worked a station near Odessa crossband to 40m with normal CW  with about 20 Watts ERP on 136kHz  (G3WSC special permit).   QRSS should be fine even another 20dB down.

If you are really stuck I probably have a breadboard version of the VXO around here somewhere.

Good luck


David  G0MRF