Sunday, May 27, 2007 at 11:48
Hi Ian,
Selcall can be heard by anyone on the same channel as you, if you need to get in contact with a friend and you don't know if they are on the channel instead of calling them over and over until the reply or you can selcall them (every one else will hear the selcall tones aswell) and if they are on channel 2 things happen....
1) There radio responds with a tone to you and on some on radios it will appear on you screen as you have made contact.
2) The radio you selcalled will have your number come up on the screen and usualy and message saying "calling" or some thing like that, so if they are at the radsio they call talk to you or if they are away fom there radio and it is switched on the know someone has called and who it is.
Selcall is not used much on UHF CB, in commercial UHF it is used alot and is a must have for HF radios using VKS, Radtel etc.
When you
UHF radio is on it is in a hear all state meaning you will hear selcall, data, voice and abusive behavour.
Look at selcall like a telephone number with 4 to 5 didgts, not all secalls on all radios are the same there are about 5 standards so you have to program you radio to the standard you want to use.
All CB radios are set to the same standard from the factory and can not be changed, only the Icom IC400 and the IC40/41 handhelds can be changed to a differant standard in the programming software, all commercial radios can also be changed in the software.
If you only want to hear your friend or you group you can use CTCSS encoding/decoding, there radio need to be set the same as yours. This should be outlawed on CB radios because someone may be able to hear you and need help or to warm you about something but you will not hear them unless the use to same CTCSS code as you.
CTCSS coding can not be heared by anyone only the enabled radios, the tone is silent and is sent as a sub carrier with you transmission.
Some radios have a function that can decode the CTCSS tone from other radios using it and display it on your screen.
CTCSS is used in all commercial radio applications to allow uses access to the network or the repeater. You can have 30 companys with 100 radios each and only hear your company.(you would not run this many radios on a single channel)
CTCSS stands for "Continuous Tone Coded Squelch System".
Look at CTCSS as a cone of silence for you and you friends because you will not be th hear anyone else on that channel, but anyone will be able to hear you and your friends.
Some times of UHF CB you will try to break into a conversation only to be ignored, they are proberly not ignoring you they proberly have the CTCSS function switched on.
Regards Richard
You may be getting mixed up
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