over engineered
If it's encrypted radio they want I could put together a Cizitzens Band Radio with A-D conversion on the front end, stick in a linear feedback shift register inside an FPG to garble the data stream, put it in a steel box and hey presto, all for a fraction of the price and it'd work too with a decent battery life.
Sounds like they're making the classic mistake, of trying to be too ambitious, too much clever technology when all they really need is an encrypted radio.
Trying to cram too much functionality and cleverness into something that a) is supposed to be portable, b)battery powered, both of which are demanding design objectives.
I bet they've got Shark DSPs doing tons of signal processing, modulation, frequency hopping all running from a battery, because it sure ain't the FM transmitter that's taking the power.
Or perhaps it's the heater for the LCD to enable it to run in temperatures of -10 degrees C, ah..but this is Afghanistan? Hot country isn't it?