"Max Power" wrote in message
...
DRM -- if it had a 7 bit ASCII teletype 'subchannel' type added to it,
could
eliminate numbers stations...
Binary files can be transmitted using only 7 bit ASCII chars, preferably
with a little error correction.

Except for the fact that you have to lug around a laptop computer... which
could easily be stolen or confiscated by the security forces of whatever
country you are in and checked for programs such as the one you mentioned,
let alone the decoded text. All of which would easily compromise the agent.

A shortwave receiver attracts little attention, and a one-time-pad secreted
inside a bar of soap is far more discrete.

As it is, there is plenty of opportunity for agents to monitor digital
signals on HF, but the primary mode of communication is numbers stations.
It would be simple to tell the agent to listen to X kHz at Y time, and send
a quick data burst signal. But then again you have to have a laptop or some
sort of decoder with you, something you don't really want to get caught
with.

Some countries are highly suspicious of all foriegners as it is, and it's
likely that they will be closely watched.


--
Tom Sevart N2UHC
Frontenac, KS
http://www.geocities.com/n2uhc