Kenwood TH-22A Instruction Manual

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Simplex channelRefers to a communications channel where the receiveand transmit frequencies are the same.Split channelRefers to a communications channel where the receiveand transmit frequencies are not the same.SqueichA function that automatically mutes a receiver's speakeroutput when no receive signal is present. Functionsmost reliably when communicating via full carrier modessuch as FM.Squelch threshold levelThe receive level at which a receiver's speaker output ismuted. This level is usually adjustable, either manuallyor automatically by the transceiver microcomputer.Standard offset .Refers to a transmit frequency offset used to accessrepeaters that is equal to the amount and directionstipulated by existing band plans for a particular region.See “Transmit offset”.Subaudible toneA low-frequency non-audible signal superimposed on atransmitted signal for the purpose of accessing sometypes of repeaters.SWR (standing wave ratio)An antenna that is not correctly matched in impedancewith a transmission line and transmitter will reflect someportion of the transmitted signal back toward thetransmitter. This causes a standing wave pattern todevelop. The ratio of maximum to minimum voltage(VSWR) on the transmission line when such a conditionexists is commonly referred to as the SWR.TO (Time-operated) Scan xWhen scanning, scan stops at all carriers received andresumes after 5 seconds.Tone AlertA function that alerts an operator via a visual and audiblealarm when the receiver squelch opens.Tone frequencySee "Subaudible tone".TOT (Time-out Timer)A function that automatically forces a transceiver fromTransmit back to Receive after timer expiration.Transmit InhibitA function that stops a transceiver from transmitting.The function has no effect on the receiver or receivefunctions.69