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http://www.uhfcb.com.au/80-Channel-UHF-Information.php website has the following chart on which channels are used and their purpose. Additional uses when known have been added to the list hereunder and to the printable chart.

Channels 5 and 35 are reserved for emergency use only; monitored by volunteers. No general conversations are to take place on this channel. Severe penalties for misuse apply.

In addition to the above channel allocations, as noted above channel 20 has been selected as channel for motor homers to communicate when in convoy in a similar manner to channel 18 being used for caravanners to communicate when travelling in convoy.

On certain roads a different channel may be used by local traffic, and where this is signed, it is wise to change to that channel. Of course change channel to have a conversation with someone in your convoy so as not to block the road channel.

While channel 40 is the higway channel, on the Pacific Highway in New South Wales channel 29 is used, and this extends across the border on the Bruce Highway into Queensland, possibly as far as Brisbane. If unsure, set your receiver to scan both channels.

UHF CB RADIO CHANNEL ALLOCATION

Channel:	Frequency:	Use:	Channel Spacing:
Channel 1	476.4250	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 2	476.4500	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 3	476.4750	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 4	476.5000	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 5	476.5250	Duplex & Simplex - Repeater Output (Emergency use only)	12.5 KHz
Channel 6	476.5500	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 7	476.5750	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 8	476.6000	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 9	476.6250	Simplex	12.5 KHz
Channel 10	476.6500	Simplex 4WD Drivers - Convoy, Clubs & National Parks	12.5 KHz
Channel 11	476.6750	Simplex Call Channel	12.5 KHz
Channel 12	476.7000	Simplex	12.5 KHz
Channel 13	476.7250	Simplex	12.5 KHz
Channel 14	476.7500	Simplex	12.5 KHz
Channel 15	476.7750	Simplex	12.5 KHz
Channel 16	476.8000	Simplex	12.5 KHz
Channel 17	476.8250	Simplex	12.5 KHz
Channel 18	476.8500	Simplex Caravan & Campers Convoy Channel also Marine Rescue in New South Wales	12.5 KHz
Channel 19	476.8750	Simplex	12.5 KHz
Channel 20	476.9000	Simplex Used as Motorhome Convoy Channel	12.5 KHz
Channel 21	476.9250	Simplex	12.5 KHz
Channel 22	476.9500	Simplex Data Only (No Voice - No Packet)	25 KHz
Channel 23	476.9750	Simplex Data Only (No Voice - No Packet)	25 KHz
Channel 24	477.0000	Simplex	12.5 KHz
Channel 25	477.0250	Simplex	12.5 KHz
Channel 26	477.0500	Simplex	12.5 KHz
Channel 27	477.0750	Simplex	12.5 KHz
Channel 28	477.1000	Simplex	12.5 KHz
Channel 29	477.1250	Simplex Pacific Hwy NSW & Qld, Sydney - Brisbane	12.5 KHz
Channel 30	477.1500	Simplex Local Emergency Network UHF CB Broadcasts	12.5 KHz
Channel 31	477.1750	Simplex Repeater Input	12.5 KHz
Channel 32	477.2000	Simplex Repeater Input	12.5 KHz
Channel 33	477.2250	Simplex Repeater Input	12.5 KHz
Channel 34	477.2500	Simplex Repeater Input	12.5 KHz
Channel 35	477.2750	Simplex Repeater Input (Emergency Use Only)	12.5 KHz
Channel 36	477.3000	Simplex Repeater Input	12.5 KHz
Channel 37	477.3250	Simplex Repeater Input	12.5 KHz
Channel 38	477.3500	Simplex Repeater Input	12.5 KHz
Channel 39	477.3750	Simplex	12.5 KHz
Channel 40	477.4000	Simplex Highway Channel	12.5 KHz
Channel 41	476.4375	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 42	476.4625	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 43	476.4875	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 44	476.5125	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 45	476.5375	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 46	476.5625	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 47	476.5875	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 48	476.6125	Duplex & Simplex - Repeater Output	12.5 KHz
Channel 49	476.6375	Simplex	12.5 KHz
Channel 50	476.6625	Simplex	12.5 KHz
Channel 51	476.6875	Simplex	12.5 KHz
Channel 52	476.7125	Simplex	12.5 KHz
Channel 53	476.7375	Simplex	12.5 KHz
Channel 54	476.7625	Simplex	12.5 KHz
Channel 55	476.7875	Simplex	12.5 KHz
Channel 56	476.8125	Simplex	12.5 KHz
Channel 57	476.8375	Simplex	12.5 KHz
Channel 58	476.8625	Simplex	12.5 KHz
Channel 59	476.8875	Simplex	12.5 KHz
Channel 60	476.9125	Simplex	12.5 KHz
Channel 61		Reserved for Future Expansion
Channel 62		Reserved for Future Expansion
Channel 63		Reserved for Future Expansion
Channel 64	477.0125	Simplex	12.5 KHz
Channel 65	477.0375	Simplex	12.5 KHz
Channel 66	477.0625	Simplex	12.5 KHz
Channel 67	477.0875	Simplex	12.5 KHz
Channel 68	477.1125	Simplex	12.5 KHz
Channel 69	477.1375	Simplex	12.5 KHz
Channel 70	477.1625	Simplex	12.5 KHz
Channel 71	477.1875	Simplex Repeater Input	12.5 KHz
Channel 72	477.2125	Simplex Repeater Input	12.5 KHz
Channel 73	477.2375	Simplex Repeater Input	12.5 KHz
Channel 74	477.2625	Simplex Repeater Input	12.5 KHz
Channel 75	477.2875	Simplex Repeater Input	12.5 KHz
Channel 76	477.3125	Simplex Repeater Input	12.5 KHz
Channel 77	477.3375	Simplex Repeater Input	12.5 KHz
Channel 78	477.3625	Simplex Repeater Input	12.5 KHz
Channel 79	477.3875	Simplex	12.5 KHz
Channel 80	477.4125	Simplex	12.5 KHz

For printable version click here (two pages)

This chart has been designed to print on both sides of an A4 page to take with you on your travels.

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UHF CB RADIO CHANNEL ALLOCATION