Kenwood TM-251A Instruction Manual

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Sub-bandA band on which this transceiver is only capable ofreceiving. No transmit functions are possible on a Sub-band. See Main Band.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) ScanWhen 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 expiry of a timer.114Transceiver LockA function that disables most buttons and controls on thetransceiver.Transmit InhibitA function that stops a transceiver from transmitting.The function has no effect on the receiver or receivefunctions.Transmit offset (shift)All Amateur voice repeaters operate on separate transmitand receive frequencies. Transmit offset is the amountthat a transmit frequency is different from a receivefrequency. See “Transmit offset direction".Transmit offset (shift) directionRefers to the direction, either plus (+) or minus (—),that a transmit frequency is with respect to a receivefrequency. Both the direction and amount of offset mustbe selected correctly to access a repeater. See“Transmit offset".VFO (variable frequency oscillator) modeThe mode that allows any individual frequency to beselected within the range of the VFO only restricted byfrequency step limitations. When in VFO mode,frequencies are selected using the Tuning control or themicrophone [UP]/[DWN] buttons.