Message-ID: <7F4F46A235044DD189E286F213313BAD@DuoLap>
From: "Marcus, PY2PLL-PY3CRX" <py2pll@py.qsl.br>
To: <rsgb_lf_group@blacksheep.org>
References: <8CC0E46CEC080C8-429C-1ADB9@webmail-d004.sysops.aol.com> <01E0862F8C254EED856C23E2ED99E057@DuoLap> <200910150940420343.130DDCAA@smtp2.numeo.fr>
In-Reply-To: <200910150940420343.130DDCAA@smtp2.numeo.fr>
Date: Fri, 16 Oct 2009 06:43:44 -0300
MIME-Version: 1.0
Subject: Re: LF: Loran chains detected
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Hi John.

>Hi Marcus,
>
>Very interesting.  What software are you using with the sound card,=
 please?
>
>73,
>John Rabson
>F5VLF
>58800 Cervon
>France
>JN17vg

It's a nice software written by G3PLX, Peter, named GPS Locked LORAN=
=20
Receiver.

It uses the pps from a gps receiver applied to the LF rig antenna inpu=
t at=20
very low levels as time & frequency reference source.

The software finds this pulses and uses them to lock the sound card sa=
mple=20
rate timing and audio center frequency (1750Hz nominal) to gps pps.

Requires a stable LF rig with 1Hz frequency accuracy tuned to 98.25KHz=
 on=20
USB, the widest IF filter avialable (300 ... 3000). The PC clock must=
 be=20
locked to any NTP server or any other method that keeps the PC time ac=
curate=20
to 1 second or less.

There is a built in Loran chain database where the GPS itself is the=
 GRI=20
10000 and have the same lat/lon as the receiveing station. Using this=
=20
database & station lat/lon it calculates and overlap the screen mask=
 for the=20
chain currently monitored.

Several other measurements such as TOA, phase and relative amplitude=
 of the=20
received signals, a simple log feature or screen shots (scope & waterf=
all)=20
manual save exists on it.

It's being modified and tested for some time now and in few days there=
 will=20
be a link to download it.

73
Marcus Ramos
PY3CRX/PY2PLL
LAT -23.765116=B0 / LON -46.553797=B0
S=E3o Bernardo do Campo - SP
http://py.qsl.br

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No virus found in this outgoing message.
Checked by AVG - www.avg.com=20
Version: 8.5.421 / Virus Database: 270.14.18/2437 - Release Date: 10/1=
5/09 03:57:00

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