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I have been doing some reading up on radios, and I see that there is a mod that you can transmit on all frequencies, now is this true, Maybe I dont quire understand how this is supposed to work, but for a volunteer fireman for example could he transmit and recive on the fire dispatch frequencie? Also does certain icom radios act like a scanner as well?

Sorry for the dum questions, Im just curious and thinking about getting into amateur radio.

Thanks
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