Icom iF22SR instruction manual Glossary, What is squelch?

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8 GLOSSARY

What is squelch?

A squelch circuit allows you to mute undesired noise while re- ceiving no signal and emit audio while receiving signals. This provides quiet standby. The [MONI] key cancels the squelch setting. This is useful to listen to weak signals that do not open the squelch.

Talk Range

The IC-F22SR is designed to maximize performance and im- prove transmission range in the field. However, the single most important factor in transmit range (talk power) is your surrounding environment. These radios are “line of sight” ra- dios and as such, transmission range is influenced by the de- gree to which you can “see” the other communicating party. Large concrete structures and heavy foliage or transmission from inside a building or vehicle will reduce your talk power.

Optimal range: wide, open areas free of obstructions.

Medium range: large buildings or trees blocking your line of sight.

Minimum range: mountainous areas or areas of heavy fo- liage.

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Contents IF22SR Foreword Supplied Accessories Page Table of Contents ‘ Switches, controls, keys and connectors Panel DescriptionVOLUME/POWER Control VOL/POWER PTT Switch PTTTX/RX Indicator LED LED Channel Selector CH‘ LED indicator Brink patternsBattery Packs Battery Packs‘ Battery pack replacement ‘ Battery cautions ‘ Battery charging Regular charging with the BC-146Regular charging with the BC-146 Rapid charging with the BC-121+AD-94 #11 Rapid charging with BC-144+AD-99Battery pack life ‘ Charging Note‘ Battery case Option Basic Operation ‘ Receiving and transmittingFrequency channel/CTCSS tone list default Channel RX/TX Freq. MHz*1 CH spacing Tone Hz*2‘ Setting squelch level ‘ Auto Scan functionExample ‘ Setting the group code numberUsing the Ctcss Tone Code Freq Push PTTCtcss Find Turn the squelch function ON/OFFUsing the Dtcs Code Example Select the Call-Ring melody Ring FunctionSmart-Ring operation see right Smart-Ring operation Call your group member with Call-Ring melodyOther Functions Audible condition‘ Power save function Key Push Push and hold Mic UP Mic DownMic a Mic BSpecifications GeneralCharger Options‘ Options Other Options HM-46L/HM-75A/HM-131L Speaker Microphone What is squelch? GlossaryWhat is Ctcss Continuous Tone Coded Squelch Sys- tem ? About CE IcomEurope0168GmbH Count on us