[Spooks] LORAN-A

[leo griffin]

On the subject of movie sound effects stolen from the world of amateur radio
and the military - Richard Rogers, in his Victory At Sea composition used CW
at the end of the Typhoon passage - all the ships safely at anchor and one
hears .... .. .... .. or for those who aren't up on their Morse, the CW
signal for laughter.

leo
KB7LOC
----- Original Message ----- 
From: "Martin Potter" <mpotter at storm.ca>
To: <undisclosed-recipients:>
Sent: Wednesday, September 01, 2004 2:08 PM
Subject: [Spooks] LORAN-A


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> As an aside (an off-topic one at that), the movie version of the
> story "On the Beach" by Nevil Shute used LORAN-A signals to make
> the sound of radio interference while the main characters were
> trying to receive a mysterious Morse signal.  The "beat note"
> between two different trains of LORAN-A pulses, at different
> pulse repetition frequencies, was unmistakable and commented on
> at the time by many who knew what the signals sounded like.
> LORAN-A operated on at least 1800, 1850, 1900, and 1950 kHz in
> different chains around the world.  If you could hear any LORAN-A
> signals at all, you could almost always hear several different
> chains at different PRFs, and could listen to the rising and
> falling "beat note" between them (caused by the constantly
> changing relative timing of the different pulses).
>
> Ben, very glad to hear that LORAN-C isn't going to go away!  At
> one time there were plans to drop it in favour of GPS.
>
> 73,
> ... Martn    VE3OAT
>
>
> Ben Mesander wrote:
> >
> >>The rolling sound thing sounds like Loran. It was used by ships as a
> >>navigational aid.
> >>
> >>30 years ago when I fist got on top band (160m) it was around 1950Khz,
but
> >>the Australian transmitter was in 1850 I think. Used to spread 40Khz. It
was a
> >>pain, and took up lage portion of the band.
> >>It was phased out in the ealy 80's in favour of the Decca Navigation.
That
> >>went recently too, in favour of GPS.
> >
> >
> > Loran-C is alive and kicking in many parts of the world on 100kHz. Loran
is a loud clicky sound as it is a time domain multiplexed pulse modulation.
> >
> > I wrote the timescale firmware for the new Loran-C stations the USCG is
deploying.
> >
> > Enjoy,
> > Ben
> >
>
>
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