Kenwood TH-D72E - Manual (Page 24)

EchoLink – 2
Q Selecting a Transmit Speed
Some EhoLink node station may not respond correctly
if a DTMF code is transmitted at fast speed. If this
happens, change the DTMF code transmission speed;
the default is 100 msec.
1 Enter Menu mode and access Menu 171.
2 Select a speed (in msec) from the available list: 50/
100/ 150.
Note: This setting is common with DTMF memory.