BTECH UV-25X2 - Chapter 6: Selective Calling; CTCSS for Selective Calling; DCS for Selective Calling; Tone-Burst for Selective Calling

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Chapter!6. !-!Selective!calli ng!
Some!tim es!when!you're!working!with!larger!groups!of!people!using!the!sam e!channel,!things!can!
get!very!crowded,!very!fa st.!To!minimize!this!problem,!several!methods!of!blocking!out!unw anted!
transmission s!on!your!frequen cy !have!developed.!In!general,!there!are!two!fo rm s!of!selective!calling!
in!two-way!radio!systems:!Group!calling,!and!indiv idu a l!c allin g .!
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Group!calling,!as!the!name!sugg est,!is!a!one-to-many!form!of!communication.!Every!radio!in!your!
working!group!is!configured!the!sam e!way!and!any!ra dio!will!make!contact!with!every!other!radio!in!
the!group.!
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Individu a l!calling,!some!times!also!known!as!paging,!is!a!one-to-one!form!of!co m mu nication.!Every!
radio!is!programmed!with!a!unique!ID !code.!And!only!by!sending!out!a!matching!code!can!you!get!
that!radio!to!op en !up !to!yo ur!tran sm ission s.!
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The!BTECH!X-SERIES!MOBILES!features!three !additional!ways!of!group!calling!!
(2TON E ,!5T O N E ,!AN D!DTMF!CAL LIN G !A R E!F O U N D !IN !C H AP T E R!5 ):!
• CTCSS!
• DCS!
• Tone-burst!(1000Hz,!1450Hz,!1750Hz,!2100Hz )!
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