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LF: RX and Sound Card

from [James Moritz] [Permanent Link][Original]
To: <[email protected]>
Subject: LF: RX and Sound Card
From: "James Moritz" <[email protected]>
Date: Thu, 1 Oct 2009 18:09:29 +0100
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Dear LF Group,
I have just uploaded "RX_Soundcard_cal_v1.pdf" to the files page at the UK500kHz group web site (go to http://groups.google.com/group/uk500khz/files - it is down at the bottom of the list). This describes a way of calibrating receiver frequency and sound card sampling rate using an off-air standard frequency such as MSF or 198kHz R4, without requiring an accurate audio frequency to calibrate the sound card. This is addressed primarily to WOLF mode transmission and reception, where this calibration has to be done fairly accurately in order for the mode to work properly, but could also be generally useful where sound card sample rate calibration has to be done, and there is no precision audio frequency source available in the shack. 

Any comments would be welcome,

Cheers, Jim Moritz
73 de M0BMU
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