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Re: LF: Loran

To: [email protected]
Subject: Re: LF: Loran
From: "James Moritz" <[email protected]>
Date: Mon, 10 Feb 2003 11:39:34 +0000
In-reply-to: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Dear Hugh, LF Group,

For an explanation of Loran C and other hyperbolic radio navigtion systems, take a look at

The Loran transmitters all operate on 100kHz, and transmit short pulses - this leads to the sidebands extending into the 136kHz bands. Usually, in SE England, you should be able to hear the rhythmic chattering sound under quiet band conditions at 136kHz - if not, you need to look into your RX sensitivity! The nearest TX is at Lessay on the french coast. Each Loran chain has a different pulse repetition frequency (GRI), so different parts of the world have different Loran lines. Because of the pulsed signal, the duty cycle is quite small, and the mean power is much less than the PEP.
Cheers, Jim Moritz
73 de M0BMU

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