Lots of digital transmissions on the air -- for a sample of how they
sound -- see URL:
http://www.wunclub.com/sounds/

Also see (and hear) at URL:
http://rover.wiesbaden.netsurf.de/~s.../DIG_intro.htm

--
73 From The Wilderness Keyboard
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"JSmith" wrote in message
...
Anyway, while searching I've run across a lot of weird noises. Lots of
warbles, and oscillating ticks and hums. Some of them are confined to a
specific frequency, but some bleed across several. Defiantly not a random
event. I know what code sounds like, but a lot of these aren't code.
They
seem to occur around the naval maritime bands. I know that the navy has
huge land based antenna that I've heard they use in a network to transmit
the time so ocean going vessels to tell their longitude, but it seems like
they could just tune into "the tick". Anyway, I'm just interested in what
these could be, not exactly what they are. Could they be 'jamming',
machine's talking to machine's (like a modem) or other?
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