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7 MAINTENANCE
Your VHF Marine Radio RO4700 is a marine radio of water proof who can meet
the requirement of JIS level 7, gives you a good reliability when using in marine
circumstance.
The equipment is designed to be maintenance free. To keep your radio in good
working condition:
z Never unscrew the equipment, either the base station or handset, For in
such case, the water proof performance will be greatly damaged.
z If the radio becomes dirty and dusty, wipe it clean with a moisture cloth, but
pay attention to never using such solvents as benzene or alcohol, for they
may damage the radio surfaces.
z Once your equipment does not work properly, never allow an unqualified
person to tamper with internal adjustments. Please contact the local dealer
for help.
TROUBLE SHOOTING
Item Symptom Cause/Remedy
1 Unit can not be powered
on.
z Check the connection to the base
station.
z Check the volume control.
2 No sound comes from
the speaker
z Set [VOL] to a suitable level.
z Set squelch to the threshold point.
3 Transmitting is
impossible, or high
power can not be
selected.
z Check to see if the PTT switch is
defective.
z Check to see if the microphone or MIC
jack is defective.
z Some channels are for low power or
receive only, change to another channel.
z Push H/L to select high power.
4 Low receiver sensitivity. z Check to see if the antenna being bad
connected.
z Check the connection between coaxial
cable and base station.
8 SPECIFICATION
Frequency coverage:
Transmit…………………………...……… 156.025 ~157.425MHz
Receive ………………………………………. 156.025 ~162.025 MHz
Mode………………………………………………………..:FM (16koG3E)
:DSC(16k0G2B)
Power supply.....……………………………………..…..13.8V DC±15%
(negative ground)
Current drain (at 13.8V) ………….….Tx high(25W) ..….. 5.5A typical
Max audio 0.8A typical
Frequency stability………………………………………… ±10ppm
(-15to+55)
Antenna impedance............................................……………....50 Ohm
Microphone............................…………………condenser type
Sensitivity at 12dB Sinad.......................................…………….....0.5μV
Adjacent Channel Rejection................................…........70dB
Audio output power.............................…………...........2W @ 8 Ohm
Audio Distortion ...............................………………………..............10%
RF Output Power....................…………………...High: 25W/Low: 1W
Harmonic Emissions................……………...High: 80dB/Low: 60dB
Dimensions (HWT)..........................................…….....71×161×147mm
Weight …………………...................................…………………...1290g
21


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