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11
Operation
This table lists codes adopted by the Associated Public Safety Communications
Officers (APCO)
Code Meaning
10-1 Your signal is bad.
10-2 Your signal is good.
10-3 Stop transmitting.
10-4 Message was received and
understood.
10-5 Relay information to ___.
10-6 I am busy. OR Are you busy?
10-7 Out of Service.
10-8 In Service.
10-9 Repeat last message.
10-10 Negative (NO).
10-11 ___ in service.
10-12 Stand by.
10-13 Report road / weather
conditions.
10-14 Information.
10-15 Message delivered.
10-16 Reply to message.
Code Meaning
10-17 En route.
10-18 Urgent.
10-19 Contact ___.
10-20 What is your location?
10-21 Call ___ by telephone.
10-22 Cancel last message.
10-23 ___ arrived at the scene.
10-24 ___ assignment complete.
10-25 Meet ___.
10-26 Estimated time of arrival is ___.
10-30 Use caution.
10-31 Pick up.
10-33 Emergency traffic. Clear the
channel.
10-34 What time is it?
10-41 Switch to channel ___.
10-62 ___ cannot understand.
Maximum Range
The maximum range and quality of CB transmissions vary depending on the
following conditions:
• the type and quality of antenna used
• the height of the antenna’s mounting location—the higher the antenna,
the better the signal’s range
• the surrounding terrain—mountains and tall buildings limit the range
• weather conditions
• the number of nearby CBs operating on the same channel
• standing wave ratio (SWR) between the antenna and the CB.