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From: "Peter Martinez" <peter.martinez@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <200603311839550854.021DC57E@smtp.wanadoo.fr> <000601c65582$aefd8ec0$cada380a@acer5gi5q0ubzj> <8bf118410604040532gf1861f9r9dfaa0fe2d6f4be1@mail.gmail.com>
Date: Tue, 4 Apr 2006 12:45:55 -0000
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Subject: Re: LF: Rugby LORAN measurement?
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>From Peter G3PLX:

No, I didn't see it go off either.  The first Tuesday in the month is 
documented as the Rugby maintenance period, but perhaps the grass didn't 
need cutting this month because the weather has been so cold.

I have written a little program which will measure the SNR of the LORAN 
signal on 137kHz, by comparing the amplitude of the signal-plus-noise to the 
amplitude of the filtered and smoothed LORAN pulse alone.It can be done at 
any time and doesn't need to wait for them to turn it off and on.   The 
program requires that the soundcard and the receiver frequency should be 
accurately calibrated, but the tools for doing this are contained within the 
program, using the LORAN signal itself as a timing and frequency standard. 
I need to do some beta tests first, then I will be asking for volunteers to 
use it to measure the LORAN SNR at various places around the UK and NW 
Europe. The results can be passed to John G3WKL and will be useful in any 
campaign to get something done about the LORAN interference on 137kHz.

73
Peter