6 FUNCTIONS FOR TRANSMIT6-13Measuring SWRThe IC-7100 has a built-in circuit for measuring antennaSWR— no external equipment or special adjustmentsare necessary.The IC-7100 can measure SWR two ways — spot mea-surement and plot measurement.D Spot measurementThis function is convenient to use when measuringSWR of the antenna to install or periodic check.q If desired, push TUNER/CALL (L) once or twice to turnOFF the antenna tuner.• If the antenna tuner is connected, and your want to mea-sure SWR of the antenna itself, perform this step.Select the desired frequency band. (p. 3-6)wOn the Mode selection screen, select the RTTY oreRTTY-R mode. (p. 3-17)If necessary, adjust the RF power to more than 30 Wron the Mic gain/RF power adjustment display.• If your are operating in the 144 MHz band, adjust the RFpower to more than 20 W.• If your are operating in the 430 MHz band, adjust the RFpower to more than 15 W.• If your are operating in the 70 MHz band, adjust the RFpower to more than 20 W. (70 MHz band transmission isavailable, depending on the transceiver version.)q Push MIC/RF PWR (C) to open the MIC gain/RFpower adjustment display.w Rotate [BANK] (L) to adjust the RF power.e Push MENU (C) to close the display.Before transmitting, monitor the operating fre-quency to make sure transmitting won’t causeinterference to other stations on the same fre-quency.Touch the TX meter one or more times to select thetSWR meter.Hold down [PTT] on the microphone or switch ONythe external TX switch to transmit.Read the SWR on the SWR meter.u• If the SWR meter points 1.5 or less, the antenna ismatched .Release [PTT] or Switch OFF the external TX switchito receive.• When the measured SWR is more than 1.5:1, adjust theantenna to match with the transceiver.Left RightCenterDisplayNOTEThis transceiver can measure SWR in the 144 MHz or430 MHz bands.Depending on the length of the connected coaxialcable, or installation condition, the measurement maybe different from the actual SWR of the antenna inthese band.The L, R, C or D in theinstructions indicate thepart of the controller.L: Left sideR: Right sideC: Center bottomD: Display (Touch screen)The best match is in this range.(1.5 or less)SWR meterRTTY mode icon
