Owner's Manual

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Specications
•
General
Number of Channels All U.S.A., Canadian, and International
10 NOAA Weather Channels
Channel Spacing 25 kHz
Modulation 5 kHz Max.
Input Voltage 13.8 VDC
Current Drain:
Stand-by 20 mA
Receive 200 mA
Transmit 5A @ High power 1A @ Low
Temperature Range -20˚ C to 55˚ C
Unit Dimensions 6.25” x 3.0” x 6”
(15.9 cm x 5.7 cm x 18 cm)
Unit Weight 2 lbs., 12.0 oz. (1100 g)
Receiver
Frequency Range 156.050 to 163.275 MHz
Receiver Type Double Conversion Super-Heterodyne
Sensitivity:
20 dB Quieting 0.35 uV
12 dB Sinad 0.30 uV
AF Output 2.5 Watts @ 8 Ohms
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Frequency Range: TX 156.025 to 157.425 MHz
RF Output Power 1 and 25 Watts
Spurious Emissions -60 dB High -55 dB Low
Microphone Type Electret
Frequency Stability +/-10 ppm
FM Hum and Noise 40 dB
Operating Your Radio
No display on LCD when
radio is turned On
Improper power
connection
Insure power connections
are proper and secure
Will transmit at
one (1) watt, but not
at 25 watts
Selected channel is
limited to one (1) watt
Switch to
another channel
Will not transmit Selected channel is
limited to receive only
Switch to
another channel
No sound from speaker Volume level is too low or
squelch level is too deep
Readjust volume
and squelch
No answer to calls Out of range of
other station
Signal is blocked
by terrain, check antenna
connections
Switch to high power
(25 watts) or move closer
Move until you have
a “line-of-sight” to
the other station
Constant beeping with
“check plotter” message
on LCD
External alarm input (blue)
wire may be pinched
or making contact with
another wire or ground.
Isolate external alarm in
(blue) wire to make sure it
is not pinched or making
contact with another wire
or ground.
Maintenance And
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Problem Possible Cause(s) Solution(s)
Operating Your Radio
Maintenance
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Very little maintenance is required to keep your CobraMarine VHF radio in good
operating condition.
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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.
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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
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NOTE
The typical usage for this marine radio is 10% transmitting, 10%
receiving incoming signals, and 80% in standby mode.
MRF57_MANL_OPERATION.indd 64-65 12/14/18 2:09 PM