Radio Shack 21-1703 A manual Maximum Range

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.

11