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Re: LF: Rugby lines

To: [email protected]
Subject: Re: LF: Rugby lines
From: Wolf DL4YHF <dl4[email protected]>
Date: Wed, 13 Jul 2005 22:07:26 +0200
Delivery-date: Wed, 13 Jul 2005 23:08:01 +0100
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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
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,

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