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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 AE33U.
WHAT IS SCANNING?
Unlike standard AM or FM radio stations, most two-way communications do not transmit
continuously. Your AE33U 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 (ANALOGUE) 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:
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Emergency Services (Police/Fire/Ambulance)
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Freenet
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PMR 446
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Marine Radio
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Aircraft
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Many business radio users
When you want to store a conventional system, all you need to know is the frequencies
they operate on. When you are scanning a conventional system, the scanner stops very
briefly on each channel to see if there is activity. If there isn't, the scanner quickly moves to
the next channel. If there is, then the scanner pauses on the transmission until it is over.
WHERE TO OBTAIN MORE INFORMATION
By itself, this manual really only provides part of what you need to know to have fun
scanning – how to program and use the scanner.
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