Maintenance And

Troubleshooting

Operating Your Radio

Maintenance

Very little maintenance is required to keep your CobraMarineVHF 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

 

 

 

 

 

 

 

 

 

Problem

 

Possible Cause(s)

 

Solution(s)

 

 

 

 

 

 

 

 

 

No display on LCD

 

Batteries are exhausted

Replace or recharge batteries

 

when radio is turned

 

Batteries not installed

Remove batteries and

 

On

 

 

 

properly

reinstall according to

 

 

 

 

 

 

 

polarity markings

 

 

 

 

 

 

 

 

NiCD batteries run

 

Batteries are at the

Replace with new batteries

 

down quickly

 

end of their life

 

 

 

 

 

 

 

 

 

 

 

Will transmit at

 

Batteries are low

Replace or recharge batteries

 

one-half (12) watt,

 

Selected channel is

Switch to

 

but not at two (2)

 

 

 

limited to one (1) watt

another channel

 

watts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Will not transmit

 

Selected channel is

Switch to

 

 

 

limited to receive only

another channel

 

 

 

 

 

 

 

 

No sound from speaker

 

Volume level is too low

Re-adjust volume

 

 

 

 

 

 

 

 

No response to

 

Button Lock is On

Press and hold

 

button press

 

 

Hi/Lo Power-Lock button

 

 

 

 

 

 

 

 

No answer to calls

 

Out of range of

Switch to two (2) watts

 

 

 

other station

or move closer

 

 

 

Signal is blocked

Move until you have

 

 

 

by terrain

a “line-of-sight” to

 

 

 

 

the other station

36 English

 

 

 

 

 

 

 

 

 

 

Operating Your Radio

Specifications

 

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 @ 12 Watt

 

Current Drain:

10 mA

Stand-by

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:

0.35 uV

20 dB Quieting

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

12 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

 

 

Nothing comes close to a Cobra® 37

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Cobra Electronics MR HH200 VP owner manual Maintenance Troubleshooting, Specifications, Hi/Lo Power-Lock button