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Re: LF: Re: WOLF BEACON 502.800

To: [email protected]
Subject: Re: LF: Re: WOLF BEACON 502.800
From: Wolfgang Büscher <[email protected]>
Date: Sat, 19 Jan 2008 21:20:23 +0100
In-reply-to: <[email protected]>
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Hello Graham,

you wrote:
Stopped at moment , unable to print localy from off air ... not sure with this mode .. local rx did not decode test message .... ???

Beware: The WOLF decoder requires a "stable" transmitter, and a precisely calibrated soundcard sampling rate. Stewart KK7KA (who invented it) wrote some information about this important aspect, and how many dB's can get lost due to errors in the sampling rate and/or frequency drift. Of course, this not only applies to the receive, but also to the transmit side.
See  http://www.scgroup.com/ham/wolf.html :

>> WOLF requires very stable and accurate transmitters and receivers. Drift of only 3 millihertz per minute is a 3 dB loss; 10 mHz/min. will probably make communication impossible.
<<


Cheers,
  Wolf  .




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