Selective Calling - Baofeng UV-5RV2+ Operating Manual

DTMF is an advanced signaling method that uses dual sinusoidal signals for a given code. A good
example of DTMF would be a touch tone phone system. In two-way radio systems, DTMF is mainly used
for automation systems and for remote control. For example, DTMF can be used to remotely activate
repeaters by transmitting a specific sequence of numbers.
This radio allows for full implementation of DTMF. The numerical and the [SCAN] and [LOCK] buttons
correspond to the matching of DTMF tones. The numeric buttons correspond to the same DTMF tones,
but to access the A, B, C, and D codes, the [MENU], [UP], [DOWN], and [EXIT] buttons are used,
respectively.
To send DTMF codes, press the buttons corresponding to the message you want to send while holding
down the [PTT] button.

Selective Calling

When working with large groups of people on the same channel there tends to be a lot of crowding in
terms of transmissions. To counteract this crowding, there are several methods of blocking out extra or
unwanted transmissions. There are two forms of selective calling available in two-way radio systems:
Group Calling and Individual Calling.
Group Calling is a one-to-many form of communication. Every radio in the working group is configured
the same way and any radio will contact every other radio in the group.
Individual Calling, 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 specific transmissions. A good example of this is a cellular phone.
This device features three different group calling methods:
•
CTCSS
•
DCS
•
Tone-burst (1750Hz)
Unfortunately, this radio does not feature any form of individual calling currently.
Note: Using group calling features does not mean that others will not be able to listen to your
transmissions. These features only provide a way to filter out unwanted incoming transmissions. Any
communications sent out while using these features will still be heard by anyone not employing filtering
options on their own.
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