Re: LF: QRSS / UA land

To:	[email protected]
Subject:	Re: LF: QRSS / UA land
From:	[email protected]
Date:	Tue, 26 Mar 2002 06:32:00 EST
Reply-to:	[email protected]
Sender:	<[email protected]>

In a message dated 3/26/02 6:03:13 AM GMT Standard Time, [email protected] 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

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