Appendices: CB Radio
Duplex mode operates only on Channels 18 and enables access to a repeater (relay) station if one exists for that particular channel within the range of your equipment. Your radio receives signals transmitted by a repeater on that channel, while it transmits signals to the repeater on a frequency 30 channels higher.
With duplex mode ON, select a channel (other than 5, the emergency channel) in the range 18. Briefly press and release the PTT (press-to-talk) button on the microphone without saying anything. If the Busy annunciator then appears in the display and you can hear the repeater tail (that zhsssh sound) through the speaker, you are within range of a repeater for that channel.
Here are the main points:–
- UHF 5 and 35 are for emergency use only (by law).
- UHF 11 is for establishing contact only (by law): you are then expected to move to another channel.
- Unseemly language is prohibited (by law), but many users overlook this!
- Dont use duplex if simplex will do. (You dont want to tie up a repeater for short-distance communication when they are really meant for long-distance work.)
- Dont hog a channel. Its a public resource, so mutual courtesies should be observed. If someone else says Breaker, try to finish up your conversation within (say) a minute, then say Go, Breaker to signal that the waiting person can now use the channel. They may have only a quick message to deliver and you can return to your previous contact if you wish.
- Dont barge in on other peoples conversations. Listen on a channel for a minute or two before starting your own conversation in case you cant hear one of the other parties who is already using the channel. If you hear nothing, its probably safe to start your own session. If others are already using the channel, wait for a natural break in their conversation and call Breaker. If they observe the courtesies mentioned in (5) above, all should be well.
This should be enough to get you started. If you observe these points, you wont go too far wrong. Youll also learn a lot(!) by listening to how other people conduct themselves on the radio.