Icom IC-7100 Advanced Instructions - Page 122
Measuring SWR, Spot measurement - built in tuner
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Previous view 6 FUNCTIONS FOR TRANSMIT Measuring SWR The IC-7100 has a built-in circuit for measuring antenna SWR- no external equipment or special adjustments are necessary. The IC-7100 can measure SWR two ways - spot measurement and plot measurement. DDSpot measurement This function is convenient to use when measuring SWR of the antenna to install or periodic check. q If desired, push TUNER/CALL (L) once or twice to turn OFF the antenna tuner. • If the antenna tuner is connected, and your want to measure SWR of the antenna itself, perform this step. wwSelect the desired frequency band. (p. 3-6) eeOn the Mode selection screen, select the RTTY or RTTY-R mode. (p. 3-17) rrIf necessary, adjust the RF power to more than 30 W on the Mic gain/RF power adjustment display. • If your are operating in the 144 MHz band, adjust the RF power to more than 20 W. • If your are operating in the 430 MHz band, adjust the RF power to more than 15 W. • If your are operating in the 70 MHz band, adjust the RF power to more than 20 W. (70 MHz band transmission is available, depending on the transceiver version.) q P ush MIC/RF PWR (C) to open the MIC gain/RF power adjustment display. Left Display Center Right The L, R, C or D in the instructions indicate the part of the controller. L: Left side R: Right side C: Center bottom D: Display (Touch screen) NOTE This transceiver can measure SWR in the 144 MHz or 430 MHz bands. Depending on the length of the connected coaxial cable, or installation condition, the measurement may be different from the actual SWR of the antenna in these band. RTTY mode icon w R otate [BANK] (L) to adjust the RF power. e P ush MENU (C) to close the display. Before transmitting, monitor the operating frequency to make sure transmitting won't cause interference to other stations on the same frequency. ttTouch the TX meter one or more times to select the SWR meter. yyHold down [PTT] on the microphone or switch ON the external TX switch to transmit. uuRead the SWR on the SWR meter. • If the SWR meter points 1.5 or less, the antenna is matched . iiRelease [PTT] or Switch OFF the external TX switch to receive. • When the measured SWR is more than 1.5:1, adjust the antenna to match with the transceiver. SWR meter The best match is in this range. (1.5 or less) 6-13