Maintenance; Troubleshooting; Specifications - Cobra Marine MR F75 Owner's Manual

Maintenance And

Troubleshooting

Operating Your Radio

Maintenance

Very little maintenance is required to keep your CobraMarine
operating condition.
Keep the radio clean by wiping with a soft cloth and mild detergent.
Rinse with fresh water. Do not use solvents or harsh or abrasive cleaners,
which could damage the case or scratch the LCD screen.
If the radio is exposed to salt water, rinse it in fresh water at least once
a day to prevent build-up of salt deposits, which could interfere with
button operation.
Troubleshooting
Problem Possible Cause(s)
No display on LCD when Improper power
radio is turned On connection
Will transmit at Selected channel is
one (1) watt, but not limited to one (1) watt
at 25 watts
Will not transmit Selected channel is
limited to receive only
No sound from speaker Volume level is too low or
squelch level is too deep
No answer to calls Out of range of
other station
Signal is blocked
by terrain
DSC distress MMSI
cannot be sent (DSC self-identification)
number is not entered
70 English
•
™ VHF radio in good
•
Solution(s)
Insure power connections
are proper and secure
Switch to
another channel
Switch to
another channel
Readjust volume
and squelch
Switch to high power
(25 watts) or move closer
Move until you have
a "line-of-sight" to
the other station
Enter your MMSI number

Specifications

Operating Your Radio
Specifications
General
Number of Channels
Channel Spacing
Modulation
Input Voltage
Current Drain:
Stand-by
Receive
Transmit
Temperature Range
Unit Dimensions
Unit Weight
Receiver
Frequency Range
Receiver Type
Sensitivity:
20 dB Quieting
12 dB Sinad
Adjacent Channel Selectivity
Intermodulation and Rejection
Spurious and Image Rejection
AF Output
Transmitter
Frequency Range: TX
RF Output Power
Spurious Emissions
Microphone Type
Frequency Stability
FM Hum and Noise
•
All U.S.A., Canadian, and International
10 NOAA Weather Channels
25 kHz
5 kHz Max.
13.8 VDC
20 mA
200 mA
5A @ High power 1A @ Low
-20˚ C to 60˚ C
6.25" x 2.25" x 7.125"
(15.9 cm x 5.7 cm x 18 cm)
2 lbs., 6.8 oz. (1100 g)
156.050 to 163.275 MHz
Double Conversion Super-Heterodyne
0.35 uV
0.30 uV
-60 dB
-60 dB
-60 dB
4 Watts @ 8 Ohms
156.025 to 157.425 MHz
1 and 25 Watts
-60 dB High -55 dB Low
Electret
+/-10 ppm
40 dB
Nothing comes close to a Cobra ® 71