How a walkie works (simple explanation)
Walkie talkies are half duplex devices that transmit one way, meaning that if its transmitting, it will not be receiving.
The device takes the sound from the walkie talkie user, converts it into electric signals transmit it to the receiving end and receives transmission from the other party and converts it back to audible audio.
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Most walkie talkies transmit at the 27 MHz and 400 to 500 MHZ for UHF radio.
The keyword for radio interception is frequency, you need to be on the same frequency.
So, to intercept a walkie talkie signal, all you have to do is to switch to the same channel the other person is transmitting at.
The best analogy that can be used here is how we can understand languages. To be able to know what someone is saying, you have to be able to speak their language, walkie talkies work the same way, in-order to receive what someone is transmitting, you have to be on the same channel as them.
So, if you want to intercept someone’s walkie talkie signal, simply ask them their channel, tune into it on your device and should be able to talk to each other even if the walkie talkies are not the same.
Or you could test out each channel to see if there are broadcasting onto that channel, move along until you find that persons channel.
Intercepting walkie talkie signals using a radio (analogue)
Radios receive from 87.5 to 108 MHz and walkie talkie devices transmit at 27MHz and 400-500 MHz for UHF radios. As discussed earlier, we need to be on the same frequency to be able to intercept each other.
Unfortunately, an analogue radio will not be able to intercept walkie talkie signals because it cannot tune into 27MHZ or 400 – 500MHZ due to its limitation.