Icom IC-7100 Advanced Instructions - Page 305
Operating the AT-180, Before operating
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Previous view 16 ANTENNA TUNER OPERATION Operating the AT-180 DDBefore operating 1. About using antenna: CAUTION: • NEVER connect the antenna worth than 3:1 anten- na. Even if the antenna tuner tune this antenna, it causes to damage the antenna tuner. • NEVER transmit with the tuner ON if no antenna is connected. This will damage both the transceiver and antenna tuner. • Check the untuned antenna SWR. (Less than 3:1 for the HF bands; Less than 2.5:1 for the 50 MHz band) • Before start tuning, monitor the operating frequency to make sure transmitting won't cause interference to other stations on the same frequency. 2. If the tuner cannot tune the antenna: ❍ Check the untuned antenna SWR. If its SWR is worth than 3:1, adjust the SWR. ❍ Check the transmit power. If the transmit power is less than 8 W, adjust the RF power on the Mic gain/RF power adjustment display. q Push MIC/RF PWR (C) to open the MIC gain/RF power adjustment display. w Rotate [BANK] (L) to adjust the RF power. e Push MENU (C) to close the display. ❍ Check the power source voltage/current capacity. ❍ If the tuner still cannot reduce the SWR to less than 1.5:1 after checking the above, perform the following: • Try manual tuning one or more times. • Adjust the antenna feedline length. (This is effec- tive for higher frequencies in some cases.) • E ven if manual tuning does not match the antenna and the tuner turns OFF the first time, it may match the antenna the second time. ❍ Tuning a narrow bandwidth antenna Some antennas, especially for the low bands, have a narrow bandwidth. These antennas may not be tuned beyond the edge of their operating bandwidth, therefore, manually tune such an antenna as follows: [Example]: Suppose you have an antenna which has an SWR of 1.5:1 at 3.55 MHz and an SWR of 3:1 at 3.8 MHz. q Select 3.55 MHz and hold down TUNER/CALL (L) for 1 second to start manual tuning. w Select 3.80 MHz and hold down TUNER/CALL (L) for 1 second to start manual tuning. 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) 16-5