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LF: <Tech>RA1792 audio calibration

To: [email protected]
Subject: LF: <Tech>RA1792 audio calibration
From: "James Moritz" <[email protected]>
Date: Wed, 30 May 2001 10:39:03 +0000
Organization: University of Hertfordshire
Reply-to: [email protected]
Sender: <[email protected]>
Dear LF group,

If you have an RA1792 RX, and require and accurate audio frequency (for calibrating a sound card for "Wolf" reception for instance), you can get one very easily by tuning the RX to 0Hz in CW mode. This makes the LO equal to the IF frequency, and some signal leaks through the mixer into the IF, where it is demodulated as a CW tone. The audio frequency output is then equal to the BFO offset, which can be set in 10Hz steps from 0 to 8kHz, as I recall. The frequency accuracy will be that of the internal reference, ie. 0.1ppm if it has been calibrated fairly recently.
This might well work in other receivers with synthesised BFOs
which can be tuned to zero too.
Cheers, Jim Moritz
73 de M0BMU

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