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Not hard at all. The US Navy was using subminiature tubes in drone receivers back in the 1950's - my Dad was in a utility squadron that flew the drones for gunnery practice. Receivers were all VHF, with pulses representing functions. Different pulse widths were discriminated, processed and sent to the flight servos. Engines were McCullough, and had two speeds - idle (for landing) and max throttle. Keep in mind most drones were flown in an simple, flat flight profile, and "caught" in nets to keep it simple.
Transmitters were modified field radios - the modulator and output power being the bulk of the modification.
If triggering a bomb, a subcarrier (ultrasonic would be best/least likely to accidentally trigger) could be used, much like the FM stereo signal triggers the stereo light in a receiver.
Think about it - if Marconi could receive a morse code "S" back in the early 1900's, technology would have made it very possible by the 1920's or 30's to trigger a bomb. Radio controlled bombs existed in WWII, and even radar triggered devices existed late in the war.
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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