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11
Operational Hints
This table lists codes adopted by the Associ-
ated Public Safety Communications Officers
(APCO).
Note:
Although this table lists the 10-codes’
meanings in the form of a statement, they
can also be phrased as questions (10-6: Are
you busy?, 10-20: What is your location?).
MAXIMUM RANGE
The maximum range and quality of CB radio
transmissions vary depending on the follow-
ing 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 radios operating
on the same channel
• standing wave ratio (SWR) between the
antenna and the CB
Code Meaning
10-1 Your signal is bad.
10-2 Your signal is good.
10-3 Stop transmitting.
10-4
Message received and under-
stood.
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 condi-
tions.
10-14 Information.
10-15 Message delivered.
10-16 Reply to message.
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 xx.
10-62 Cannot understand.
Code Meaning
21-1705.fm Page 11 Thursday, September 7, 2000 10:41 AM