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12 DTMF
12.8 Functions Related to DTMF Code Encoding
First Digit Time
First Digit Time is used to extend the amount of time to send the first digit of the DTMF code when the transceiver starts
transmitting the DTMF code.
Extending the transmission time for sending the first digit of the DTMF code will prevent the receiving transceiver from
failing to receive the incoming DTMF code while the battery saver is active or the transceiver is scanning. This will enable
the receiving transceiver to reliably decode the received DTMF code.
The time for sending the first digit of the DTMF code is the sum of the transmission time configured for DTMF Speed and
First Digit Time.
Transmit Time for the 1st digit of DTMF = value configured for DTMF Speed (Digit Time) + value configured
First Digit Time
Example: First Digit Time: 100 ms, Encode Code: 123
Configuration using KPG-169D/ KPG-170D/ KPG-175D
Configuring the First Digit Time (
* and # Digit Time
* and # Digit Time is used to extend the transmit duration to send the * tone and # tone of the DTMF code.
* tone and # tone tend to be used for special functions. * and # Digit Time enables the receiving transceiver to reliably
decode these tones.
The duration to send the * tone and # tone is the sum of the transmission time configured for DTMF Speed and the * and #
Digit Time.
DTMF transmission time of the * and # tones = DTMF Speed (Digit Time) + * and # Digit Time
Example: * and # Digit Time: 100 ms, Encode Code: *01
FUNC (K)/Ver 1.20
PTT
Press
Transmit
Transmit Start
DTMF
First Digit Time
Count Start
Time
0 s
Figure 12-4 First Digit Time
See
Edit > DTMF > Encode)
PTT
Press
Transmit
Transmit Start
DTMF
* and # Digit Time
Time
Table 12-5 * and # Digit Time
Release
Transmit End
1
2
3
Expire
100 ms
Release
Transmit End
*
0
1
Count Start Expire
0 s
100 ms + DTMF Speed
CONTENTS
INDEX
140
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