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Date: Wed, 13 Jul 2005 22:07:26 +0200
From: Wolf DL4YHF <dl4yhf@freenet.de>
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To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Rugby lines
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Hi Dave,

>The blanker idea may work but when there is such a large proportion of
>noise, if you manage to cut it all out there isn't much signal left
>anyway... 
>
>  
>
Well, the blanker would cost you about 1/5th along the time axis (see 
screenshot below). During the remaining 4/5th the receiver may run at 
maximum sensitivity - which would theoretically cost you about 2dB. This 
screenshot was made from Jim's recording (without the noiseblanker of 
course). Imagine you wiped out the pulse trains, and filled the "gaps" 
by using a receiver with a bandwidth of less than 1/GRI. Here: 1/63 
milliseconds, which means RX bandwidth of less than ~ 15 Hz, which still 
suitable for moderate "normal" CW speeds. Of course, this principle only 
works as long as Rugby doesn't start dual-rated transmission (like some 
other Loran sites) - this would make things much more complicated.



Best regards,
 Wolf DL4YHF