What Is Scanning; Conventional Scanning; Understanding Scanning - Uniden EZI33XLT+ Owner's Manual

UNDERSTANDING SCANNING

This section provides you with background on how scanning
works . You don't really need to know all of this to use your
scanner, but some background knowledge will help you get
the most from your EZI33XLT+ .

WHAT IS SCANNING?

Unlike standard AM or FM radio stations, most two-way
communications do not transmit continuously . Your
EZI33XLT+ scans programmed channels until it finds an
active frequency, then stops on that frequency and remains
on that channel as long as the transmission continues . When
the transmission ends, the scanning cycle resumes until the
scanner receives another transmission .

CONVENTIONAL SCANNING

Conventional scanning is a relatively simple concept . Each
group of users in a conventional system is assigned a
single frequency (for simplex systems) or two frequencies
(for repeater systems) . Any time one of them transmits,
their transmission always goes out on the same frequency .
Up until the late 1980's, this was the primary way that
radio systems operated .
Even today, there are many 2-way radio users who operate
using a conventional system:
• Emergency Services
(Police/Fire/Ambulance)
• Freenet
• PMR
UNIDEN EZI33XLT+
• Marine Radio
• Aircraft
• Many business radio
users
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