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From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <200603311839550854.021DC57E@smtp.wanadoo.fr> <000601c65582$aefd8ec0$cada380a@acer5gi5q0ubzj> <8bf118410604040532gf1861f9r9dfaa0fe2d6f4be1@mail.gmail.com> <004501c657e5$b779fbf0$0300a8c0@LAPTOP>
Date: Tue, 4 Apr 2006 14:00:56 +0100
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Subject: Re: LF: Rugby LORAN measurement?
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Hi Peter (and Dave) I dont recollect there being an "off" quite so often
these days. The only have 3 of the twelve mast still up so maybe they only
need 3 offs a year instead of twelve :-))

I would be happy to run the LORAN-C field strength s/w from here, out on the
East Coast, Peter. I do get reasonable clear waterfall pictures during the
day if the weather is good (the old 'uns are out in the garden, and not
watching Countdown !!) I am running Win98SE, if that is acceptable.
Cheers de Alan G3NYK

----- Original Message -----
From: Peter Martinez <peter.martinez@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: 04 April 2006 13:45
Subject: Re: LF: Rugby LORAN measurement?


> 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
>
>