Icom IC-7100 Advanced Instructions - Page 307
Setting the AT-180 internal switches, Automatic tuner start (HF bands only), PTT tune function
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Previous view 16 ANTENNA TUNER OPERATION Setting the AT-180 internal switches The optional AT-180 has 3 operating configurations for HF band operation. Select a suitable configurations for your antenna system. q Remove the top cover of the AT-180. w Set the tuner switches to the desired positions ac- cording to the table below. SW Position Operation A The tuner operating mode is set by S2 (default) described below. S1 B THROUGH INHIBIT The tuner tunes the antenna even when the antenna has poor SWR (up to VSWR 3:1 after tuning). In this case, manual tuning is necessary each time you change the frequency although the tuner automatically starts tuning when the VSWR is higher than 3:1. This setting is called "through inhibit," however, the tuner is set to "through" if the VSWR is higher than 3:1 after tuning. C TUNER SENSITIVE SETTING The tuner tunes each time you transmit (except SSB mode). Therefore, the lowest SWR is obtained at any given time. For SSB mode, the same SETTING as the "D" position. S2 D NORMAL (default) The tuner tunes when the SWR is higher than 1.5:1. Therefore, the tuner activates only when tuning is necessary. • AT-180 inside top cover S2 S1 DC BA DDAutomatic tuner start (HF bands only) If you want to turn ON the tuner when the VSWR is worth than 1.5:1, turn this function ON in the "Auto Start" item of the "Function" Set mode, and turn OFF the Antenna tuner. (p. 17-20) SET(C) > Function > Tuner > Auto Start DDPTT tune function The AT-180 tunes when [PTT] is pushed after the frequency is changed (more than 1%) if the AT-180 is turned ON. This function removes the 'hold down TUNER/CALL (L)' operation and activates with the first transmission on the new frequency. (p. 17-20) Turn this function ON in the "PTT Start" item of the "Function" Set mode. SET(C) > Function > Tuner > PTT Start 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) 16-7