Thread: Dual Frequency radio communication

Hi
Had an idea, and wanted to know more about it really,
normal radios and walkitalkies etc, use a frequency and can pick up and send on that frequency, which is all good, then presumably in the military they have some kind of encryption for those radio signals so other people cant just scan the frequencies and listen in.
But what about splitting the signal over two different frequencies (with encryption if needed) then the reciever picks up both of these frequencies and puts the message back together again
A, would this be possible
B, would it be more secure

Originally Posted by Thysk

Hi
Had an idea, and wanted to know more about it really,
normal radios and walkitalkies etc, use a frequency and can pick up and send on that frequency, which is all good, then presumably in the military they have some kind of encryption for those radio signals so other people cant just scan the frequencies and listen in.
But what about splitting the signal over two different frequencies (with encryption if needed) then the reciever picks up both of these frequencies and puts the message back together again
A, would this be possible
B, would it be more secure

Not only possible, but already done in many modern communication systems: Frequency-hopping spread spectrum - Wikipedia, the free encyclopedia

Today's piece of free trivia: Hedy Lamarr, the actress, got a patent for this in 1942.

ahh thanks very much for your knowledge, gives me something to read