suggestions needed: agent to local hq, using MW or FM band to transmit information

From: Max Power (mikehack_at_u.washington.edu)
Date: 03/31/05 

Date: Thu, 31 Mar 2005 01:44:29 -0800

I am looking for suggestions with respect to a design and human interfaces
problem:

How can an agent contact a local HQ using a MW or FM band transmitter and
primitive signalling (like polytone or even Morse code) using the most
primitive of equipment.

For MW transmission, frequencies in-between local high power carrier waves
seems to be safer with respect to escaping detection as most receivers are
digital these days and cannot tune in-between channels. The same concept
applies to FM, albeit I suspect that only Morse code would be used to keep
the transmission 'narrowband'.

I am assuming some crypto comes into play, but 'simple' hard crypto is
preferred conceptually.

Relevant Pages