BTECH GMRS-20V2, Руководство пользователя

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Chapter 6. - Selective calling
Sometimes when you're working with larger groups of people using the same channel, things can get
very crowded, very fast. To minimize this problem, several methods of blocking out unwanted
transmissions on your frequency have developed. In general, there are two forms of selective calling in
two-way radio systems: Group calling, and individual calling.
Group calling, as the name suggest, is a one-to-many form of communication. Every radio in your
working group is configured the same way and any radio will make contact with every other radio in the
group.
Individual calling, sometimes also known as paging, is a one-to-one form of communication. Every radio
is programmed with a unique ID code. And only by sending out a matching code can you get that radio
to open up to your transmissions.
The BTECH GMRS-20V2 features three additional ways of group calling
(2TONE, 5TONE, AND DTMF CALLING ARE FOUND IN CHAPTER 5):
• CTCSS
•
DCS
•
Tone-burst (1000Hz, 1450Hz, 1750Hz, 2100Hz)