So why would you choose to use a two-way radio instead of a scanner? There are a few reasons people prefer to use a commercial radio, such as better audio and better reception, but the biggest reason is because of the difficulty created by simulcast systems. Scanners are readily available, relatively cheap (compared to a commercial radio) and never require you to be authenticated on the system you want to monitor. Of course, most system admins won’t let just anyone with a radio on their systems, even if you just want to listen, which is why most hobbyists use receive-only radios, or scanners, to listen to these systems. By law, if you want to connect to those systems, you need to be authorized to be on them. Normally, when you attempt to use a commercial radio on most systems, those radios will connect or “affiliate” with that system in order to be able to transmit and receive audio. Non-affiliation scanning refers to using a commercial, two-way radio to listen to trunked public safety and business systems without actually connecting to those systems.
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