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No display on LCD
when radio is turned
On
Batteries are exhausted
Batteries not installed
properly
Replace or recharge batteries
Remove batteries and
reinstall according to
polarity markings
NiCD batteries run
down quickly
Batteries are at the
end of their life
Replace with new batteries
Will transmit at
one-half (
1
2) watt,
but not at two (2)
watts
Batteries are low
Selected channel is
limited to one (1) watt
Replace or recharge batteries
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 Re-adjust volume
No response to
button press
Button Lock is On Press and hold
Hi/Lo Power-Lock button
No answer to calls Out of range of
other station
Signal is blocked
by terrain
Switch to two (2) watts
or move closer
Move until you have
a “line-of-sight” to
the other station
37
Nothing comes close to a Cobra
®
Specifications
36
English
Maintenance And
Troubleshooting
Operating Your Radio Operating Your Radio
Specifications
General
Frequency Range: TX 156.025 to 157.425 MHz
Frequency Range: RX 156.050 to 163.275 MHz
Number of Channels All U.S., Canadian, and International
10 NOAA Weather Channels
Channel Spacing 25 kHz
Modulation 16 KOF3E
Input Voltage 6 VDC
Battery Life: Alkaline Batteries:
5% TX, 5% RX, 90% Stand-by 20 Hours @ 2 Watts, 24 hours @
1
2 Watt
Current Drain:
Stand-by 10 mA
Receive 35 mA
Transmit 700 mA @ High power 200 mA @ Low
Temperature Range -20˚C to 60˚C
Radio Dimensions W x D x H 2.13" x 1.2" x 8.77" (including antenna)
(4.1 mm x 0.5 mm x 22.8 mm )
Radio Weight 4 oz. (without batteries)
(0.1 kg)
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
Adjacent Channel Selectivity -50 dB
Intermodulation and Rejection -60 dB
Spurious and Image Rejection -50 dB
AF Output 250 mW @ 8 Ohms
Transmitter
Frequency Range: TX 156.025 to 157.425 MHz
RF Output Power
1
2 Watt and 2 Watts
Spurious Emissions -60 dB High -55 dB Low
Microphone Type Condenser
External Microphone Impedance 1000 Ohms
Frequency Stability +/-10 ppm
FM Hum and Noise -45 dB
Problem Possible Cause(s) Solution(s)
Maintenance
Very little maintenance is required to keep your CobraMarine
VHF radio in good
operating condition.
Keep the radio and charger clean by wiping with a soft cloth and mild detergent.
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, wipe with a soft, moist cloth at least
once a day to prevent build-up of salt deposits, which could interfere with
button operation.
If the radio will be stored for a long period, such as over the winter, remove the
batteries from the battery compartment and store them in a separate package.
This is especially so if you are using alkaline batteries.
Troubleshooting
100VP-Eng 12/3/03 5:37 PM Page 36
21


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