Chapter 8 -Selective Calling; Ctcss Dcs - Radioddity GA-510 User Manual

If you have the keypad lock enabled on your radio, you can still send DTMF tones the regular
way without having to unlock your radio.

Chapter 8 -Selective calling

Some times when you're working with larger groups of people using the same channel, communication
can get very crowded or disorderly. 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.
Radioddity GA-510 features three different ways of group calling
CTCSS
DCS
Tone-burst (1000Hz, 1450HZ, 1750Hz,2100Hz)
Radioddity GA-510 does not feature any form of individual calling
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Using these features does NOT mean that others won't be able to listen in on your transmissions.
They only provide a method to filter out unwanted incoming transmissions. Any communications
mode while using these features will still be heard by anyone not employing filtering options of
their own.
Also, you cannot change the CTCSS or DCS settings while in memory (MR) mode.
CTCSS and 1750Hz tone-burst are also popular methods among amateur radio operators to open up
repeaters.
CTCSS
CTCSS is set with menus 11 RX CTCSS and 13 TX-CTCSS.
For a complete list of available CTCSS codes and corresponding sub-tone frequencies, see Table C.2,
"CTCSS Frequencies" in Appendix C, Technical specifications.
Procedure 8. 1. CTCSS setup how-to
1. Press the [MENU] key to enter the menu.
2. Enter 1and 1 on the numeric keypad to get to receiver CTCSS.
3. Press [MENU] to select.
4. Enter desired CTCSS sub-tone frequency in hertz on the numeric keypad.
5. Press [MENU] to confirm and save.
6. Enter 1 and 3 son the numeric keypad to go to transmitter CTCSS.
7. Press [MENU] to select.
8. Enter desired CTCSS sub-tone frequency in hertz on the numeric keypad. Make sure it's the same
frequency as that you entered for receiver CTCSS.
9. Press [MENU] to confirm and save.
10. Press BACK to exit the menu system.
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