It could be some sort of navigation signal or some form of data transmission.

All life all holiness come from you O Lord
http://pwp.surfglobal.net/mjmiller/index.htm





"Frank Dresser" wrote in message ...

"Selwyn-Lloyd McPherson" wrote in message
...

[snip]

I've just gotten into shortwave radio and while I like listening to all
of the chatter, I am particularly fond of the noises that I am picking
up. There just seem to be so many types. I wish I knew which ones are
nonesense atmospheric/mechanical noise and which are meaningful. I hear
a lot of pulses or tones at regular intervals (and that are not the UTC
time broadcast). I wonder what these are.

Hmm. . .

Selwyn-Lloyd


Check out the sounds at:

http://www.wunclub.com/sounds/index.html

This is from:

http://www.wunclub.com/

Wunclub's digital signal FAQ is worth reading.

Frank Dresser