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Symptom Possible Cause Remedy
ANT connector (rear panel) is loose
or disconnected.
Fasten antenna connector tightly.
Antenna has separated. Install new antenna vertically.
Antenna cable is damaged or
immersed with water.
Lay new cable (50 ohm coaxial
cable).
Radio Barrier (large vessel, crane,
mountain, etc.) in the signal path.
Noise but no or poor
signal reception
Transmitter is too far away or
transmitting in low power.
Line-of-sight is a rule for VHF
communications.
Refer to items above.
POWER setting is
“
LOW
”
.Set it to
“
HI
”
.
“
TX
”
mark
appears but no or
low output power.
The channel is to be operated in
low power. (
“
LOW
”
appears.)
INTL and US channels 13, 17, 67,
77 are low power channels.