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%
( n e g a t i v e
g r o u n d )
Current drain (at 13.8V) ………….….Tx high(25W) ..…..
5.5A typical
Max audio
0.8A typical
Frequency stability…………………………………………
±
10ppm
(-15
℃
to+55
℃
)
Antenna impedance............................................……………....
50 Ohm
Microphone............................…………………
condenser type
Sensitivity at 12dB Sinad.......................................…………….....
0.5
μ
V
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
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