Chapter 6.-Dual Watch; Chapter 7 -Dtmf - Radioddity GA-510 User Manual

Scanning for DCS Tone
1. Press the [MENU] key to enter the menu.
2. Enter 2 and 9 on your numeric keypad to come to Menu 29: Scan DCS
3. Press the [MENU] key to scan.
4. The DCS changes indicate that the machine has entered the DCS scanning status, then DCS
changes rapidly according to the standard sequence. When the radio finds that the DCS in the
receiving signal is consistent with one of the standard sets of DCS, the radio stops scanning and
receives the speech.
5. Press the BACK key to exit the menu.

Chapter 6.-Dual Watch

In certain situations, the ability to monitor two channels simultaneously can be a valuable asset.
Radioddity GA-510 features Dual Watch with the ability scans between two frequencies at a fixed
intervals and to lock the transmit frequency to one of the two channels it monitors.
Procedure 6.1. Enabling or disabling Dual Watch mode
1. Press the [MENU] key to enter the menu
2. Enter 7 on the numeric keypad to get to Dual Standby.
3. Press [MENU] to select.
4. Use the [ ] and [ ] keys to enable or disable.
5. Press the [MENU] key to confirm.
6. Press the BACK key to exit the menu.
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DTMF is an in-band signaling method using dual sinusoidal signals for any given code. Originally
developed for telephony systems, it has proved a very versatile tool in many other areas.
In two-way radio systems, DTMF is most commonly used for automation systems and remote control.
A common example would be in amateur radio repeaters where some repeaters are activated by
sending out a DTMF sequence (usually a simple single-digit sequence)
Table 7.1. DTMF frequencies and corresponding codes
697 Hz
770 Hz
852 Hz
941 Hz
GA-510 has a full implementation of DTMF, including the A, B, C and D codes.
The numerical keys, as well as the *, and #, keys correspond to the matching DTMF codes as you
would expect The A, B, C and D codes are located in the MENU, VFO/MR, [▲] and [ ] keys
respectively (+).
To send DTMF codes, press the key(s) corresponding to the message you want to send while holding
down the PTT key.

Chapter 7 -DTMF

1209 Hz 1336 Hz 1477 Hz 1633 Hz
1 2 3 A - [MENU]
4 5 6 B - VFO/MR
7 8 9 C - [▲]
* 0 # D - [ ]
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