Icom IC-78 Instruction Manual - Page 20

4 OPERATION ï Optional AT-120/AT-130/AH-4 operation The AT-120, AT-130 or AH-4 matches the IC-78 to a long wire antenna more than 7 m (23 ft) long (3.5 MHz and above). • See p. 11 for connection. • See the connected antenna tuner's instruction man- ual for installation and antenna connection details. • Setting example: For mobile operation Optional AH-2b antenna element For outdoor operation Long wire AT-120 AT-130 AH-4 IC-718 MODE FILTER TS PWR AF SQL RIT SHIFT MIC PHONES LOCK ˛ V/M1 A=B2 A/B3 MW4 M=C5L M V6 SP7L SCN8 VOX9 .NR ANF0 FE-INNPT NB COMP SET P.AMP ATT TUNER ∫ CH DN UP∫ R WARNING: HIGH VOLTAGE! NEVER touch the antenna element while tuning or transmitting. TUNER OPERATION Tuning is required for each frequency. Be sure to re-tune the antenna before transmitting when you change the frequency- even slightly. • Tuner type setting (p. 32) q Push [PWR] for 1 sec. to turn power OFF. w Enter initial set mode. • Turn power ON while pushing and holding [SET]. e Push [UP Y] or [Z DN] to select [TUNER]. r Selects connected antenna tuner type by rotating the channel selector. • no : no antenna tuner is selected. • 4 : AH-4 is selected. • 12 : AT-120 is selected. • 13 : AT-130 is selected. y Push [PWR] for 1 sec. to turn power OFF. u Push [PWR] to turn power ON again. • MANUAL TUNING q Set the desired channel. w Push [TUNER] to start tuning. • " " blinks and "CW" appears while tuning. [TUNER] switch NEVER operate the AT-120, AT-130 or AH-4 without an antenna wire. The tuner and transceiver will be damaged. NEVER operate the AT-120, AT-130 or AH-4 when it is ungrounded. Transmitting before tuning may damage the transceiver. Note that the AT-120, AT-130 or AH-4 cannot tune when using a 1⁄2 λ long wire or multiple of the operating frequency. e" " lights constantly when tuning is completed. (except when AT-120 is connected; the indicator goes out) • When the connected wire cannot be tuned, the " " goes out, the antenna tuner is bypassed and the an- tenna wire is connected to the antenna connector on Tuning indicator; Blinks: While tuning Appears: Tune is completed Disappears: Tune is not completed (When AT-120 is connected, the indicator disappears even when tuned completely.) the transceiver directly. r To bypass the antenna tuner manually, push [TUNER]. (AH-4 only; starts tuning again when AT120 or AT-130 is connected) 18