Good Sound Setting is :
Noise Cancel ON
AGC OFF
DTMF ON or OFF
Key PTT Mode SQC Signal
SQC Active LOW
Audio->M17 Gain ->13
to enable TX Frequency and RX Frequency ON UHF change 146 to 480 step 0.01
name="tx_freq" min="144.0000" max="480.0000" step="0.01"
testing on M17-THA ROOM-U: