[Spooks] Re: Spooks Digest, Vol 7, Issue 38

[Ben Mesander]

>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