Icom IC-9100 Instruction Manual - Page 93

6 FUNCTIONS FOR TRANSMIT ■ Measuring SWR (Band: HF/50/144/430 MHz) The IC-9100 has a built-in circuit for measuring antenna SWR- no external equipment or special adjustments are necessary. The IC-9100 can measure SWR two ways- spot measurement and plot measurement. D Spot measurement q P ush [TUNER] once or twice to turn OFF the antenna tuner. w Hold down [ANT•METER] for 1 second, one or more times, to select the SWR meter. e Push [CW/RTTY] once or twice to select the RTTY mode. r P ush [PTT] on the microphone to transmit. (or [TRANSMIT] on the transceiver). t R otate [RF POWER] clockwise past the 12 o'clock position for more than 30 W of output power (30%). y Read the SWR on the SWR meter. u R elease [PTT] to receive. (or push [TRANSMIT] again) The built-in antenna tuner matches the transmitter to the antenna when the SWR is less than 3:1*. * 2.5:1 in the 50 MHz frequency band. D Plot measurement Plot measurement allows you to measure the SWR over an entire band. q P ush [MENU] to display the "M2" screen (Menu 2), then push [SWR](F-3). • The SWR graph screen appears. w R otate [RF POWER] clockwise past the 12 o'clock position for more than 30 W of output power (30%). e S et the center frequency for the SWR to be measured. r H old down [F-5] for 1 second one or more times to select 10, 50, 100 or 500 kHz steps as the SWR measuring step. t P ush [F-3] one or more times to select 3, 5, 7, 9, 11 or 13 steps as the number of measuring steps. y Push [F-1] to start the measuring. u P ush [TRANSMIT] or hold down [PTT] on the mi- crophone to measure the SWR. • A frequency marker, "∫," appears below the SWR graph. i P ush [TRANSMIT] again or release [PTT] to move the frequency marker and frequency indication to the next frequency to be measured. o R epeat steps u and i to measure SWR over the entire frequency range. !0 W hen the measured SWR is more than 1.5:1, adjust the antenna to match with the transceiver. The antenna SWR cannot be measured on the 1200 MHz frequency band*. * The optional UX-9100 is required. The best match is in this range. M1 AGC DUP 1⁄4 RTTY SCP M2 SCAN MEM SWR TCON VSC SWR Push STEP 10k Start measuring Select number of SWR measuring steps Select SWR measuring step • Measuring (after pushing [F-1]) SWR STEP 10k Frequency marker appears and moves after measurement. When measurement points are set outside of the operable frequency band, the frequency marker blinks. - 3.0:1 - 2.0:1 - 1.5:1 - 1.0:1 Typical display SWR varying between 1 and 2, full scale up to SWR 4.0:1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 84