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Make sure that the PTT (push-to-talk) switch is pressed before you begin to speak and 
released as soon as the message is complete.

When approaching the limits of radio range, the other party may not be able to hear your 
transmissions and there may be an increase in background noise when messages are 
received. You may still be out of range even though you can hear a message. The reason 
for this is that the signal you are receiving is usually transmitted at a higher power level 
than the one transmitted by your radio. Communication may be improved by moving to 
higher ground or away from shielding objects such as tall buildings or hills.

In the standby mode (power on, not transmitting), radio power consumption is relatively 
low. Therefore, you can probably leave the radio on for one or two days without operating 
the vehicle and the battery should not become seriously discharged. However, if the 
outdoor temperature is low enough to significantly decrease battery capacity, the radio 
should be turned OFF when not in use.

Since power consumption is significantly higher when transmitting, it is good practice to 
have the vehicle running while transmitting. This ensures that optimum power is being 
delivered to the radio and that the battery does not become discharged.

The radio Control Head requires periodic cleaning, depending upon the operating 
environment. 

You will need a soft brush of a size that can access all exposed areas of the Control Head. 
You will also need a vacuum cleaner that is portable enough to easily access the Control 
Head.