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DTMF
Periodic - If the system requires periodic awareness of who is transmitting, for example for health &
safety reasons, then a telegram is sent when the PTT is first pressed and periodically during the
transmission.
De-Key - An encode telegram can also be sent "On Dekey" when the PTT is released, to act as a
Cleardown call.
Benefits
Telegrams tied to PTT provide valuable system information.
Telegrams sent Once on PTT simplifies radio operation.
End of Message Alert speeds up communications.
10.7
Side Tones On/Off
Whenever the radio encodes (sends) a 5 tone telegram, usually these tones are also heard from the
radio's loudspeaker to act as a confidence aid for the radio user. In the case of Telegram on PTT, this
also indicates when it is OK to start to talk.
These "side tones" can be set on or off, to cater for the user's preference.
11.0
DTMF
DTMF (Dual Tone Multi Frequency) is used when the radio is required to operate with an interface to
a telephone system.
On all radios a DTMF encode sequence can be sent, and
on the GM360 with SMART mic and the GM380, the keypad can be put into DTMF live dial mode.
Each DTMF encode sequence can:
be up to 24 digits long;
have digits 0 - 9, P (pause),
The radio does not decode DTMF. A DTMF decode option board can be fitted if required.
11.1
DTMF encode sequence
All radios can send pre programmed DTMF sequences. The sequences cannot contain a
combination of 5T and DTMF digits; however, 5T and DTMF sequences can be combined in a
telegram.
*
#.
and
2-29
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