Icom IC-7600 Instruction Manual - Page 121

8 ANTENNA TUNER OPERATION • Automatic tuner start (HF bands only) If you want to deactivate the tuner under conditions of VSWR 1.5:1 or less, use the auto tuner start function and turn the tuner OFF. This function activates the tuner automatically when the SWR is high. This function is controlled in set mode. (p. 129). • The tuner may not be activated if the TX power is not output stably longer than the specified time period as SSB or CW mode operation. • PTT tuner start Tuning of the internal*/external antenna tuner starts when [PTT] is pushed on a new frequency (more than 1% from last-tuned frequency). This function removes the "push and hold [TUNER]" operation and activates for the first transmission on a new frequency. *Tuning starts if the internal antenna tuner is ON. This function is turned ON in set mode. (p. 129). 1 ■ Optional external tuner operation 2 • AH-4 HF AUTOMATIC ANTENNA TUNER • AH-4 operation The AH-4 matches the IC-7600 to a long wire antenna Tuning is required for each frequency. Be sure to 3 more than 7 m/23 ft long (3.5 MHz and above). re-tune the antenna before transmitting when you • See p. 18 for the transceiver and AH-4 connection. change the frequency- even slightly. 4 • See the AH-4 instruction manual for AH-4 installa- tion and antenna connection details. q S et the desired frequency in an HF or 50 MHz 5 band for use with the AH-4. AH-4 setting example: For mobile operation • The AH-4 will not operate on frequencies outside 6 of ham bands. Optional AH-2b antenna element w Push and hold [TUNER] for 1 sec. • The indicator on the switch blinks while tuning. 7 TUNER 8 9 For outdoor operation 10 Long wire 11 e T he indicator on the switch lights constantly when tuning is complete. 12 • When the connected wire cannot be tuned, the R DANGER: HIGH VOLTAGE! indicator on the switch goes out and the AH-4 is 13 bypassed. At that point the antenna wire connec- NEVER touch the antenna element while tuning tion is to the transceiver directly, and not via the 14 or transmitting. AH-4 antenna tuner. r To bypass the AH-4 manually, push [TUNER]. 15 NEVER operate the AH-4 without an antenna wire. The tuner and transceiver will be damaged. NOTE: PTT tuner function is also available. See p. 129 for details. 16 NEVER operate the AH-4 when it is not grounded. Transmitting before tuning may damage the trans- • Antenna tuner of the IC-PW1/EURO 17 ceiver. Note that the AH-4 cannot tune when using a ½λ long wire or multiple of the operating frequency. When using an external antenna tuner such as the ICPW1/EURO's tuner, tune with the external antenna 18 tuner, while the internal tuner is turned OFF. After tun- When connecting the AH-4, the antenna connector ing is completed, turn the internal tuner ON. 19 assignments are [ANT2] for the internal tuner and [ANT1] for the AH-4. The antenna indicator in the Otherwise, both tuners tune simultaneously and correct tuning may not be obtained. 20 LCD displays "ANT1(EXT)" when the AH-4 is con- See the instruction manual included with each nected and selected. antenna tuner for their respective operations. 21 114