Both have 16 tones to choose from, but only send bursts of up to 5 tones. Receivers that are set to respond to the transmitted tone sequence will open their squelch, while others will remain muted.ĬCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-1 and CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-2 ĬCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-1 has a 100 ms milliseconds (.001 of a second) tone duration per tone, where CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-2 has a 70 ms milliseconds (.001 of a second) tone duration. Selcall (selective calling) is a type of squelch protocol used in radio communications systems, in which transmissions include a brief burst of sequential audio tones. CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R) stands for Comité Consultatif International des Radiocommunications, which has now become the ITU-R. CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-2 is also known as CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-7, because CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-2 is based on CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-7 recommendations CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-1 is based on CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-1 recommendations. CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-1 and CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-2 only differ in the tone duration, and PCCIR only differs in the group, reset, and repeat tone frequencies. CCIR-1 and CCIR-2 only differ in the tone duration, and PCCIR only differs in the group, reset, and repeat tone frequencies.ĬCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R) Selcall consists of CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-1, CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R)-2, and PCCIR, which are 5-tone selcall modes for VHF Very High Frequency (30-300 MHz)/ UHF Ultra High Frequency (300-3000 MHz) radios. CCIR selcall consists of CCIR-1, CCIR-2, and PCCIR, which are 5-tone selcall modes for VHF/UHF radios.
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