Icom IC-7700 Instruction Manual - Page 148
Antenna tuner operation
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10 ANTENNA TUNER OPERATION ■ Antenna tuner operation D Tuner operation TUNER The internal automatic antenna tuner matches the transceiver to the connected antenna automatically. After the tuner matches an antenna, the variable capacitor settings are memorized as a preset point for each frequency range (100 kHz steps). Therefore, when you change the frequency range, the variable capacitors are automatically preset to the memorized setting. CAUTION: NEVER transmit with the tuner ON when no antenna is connected. This will damage the transceiver. Be careful of the antenna selection. ➥ Push TUNER to turn the internal antenna tuner ON. The antenna is tuned automatically when the antenna SWR is higher than 1.5:1. • When the tuner is ON, [TUNER] switch indicator lights green. • While tuning, [TUNER] switch indicator blinks green. NOTES: • NEVER transmit without an antenna properly con- nected to antenna port in use. • When 2 or more antennas are connected, select the antenna to be used with [ANT]. • If the SWR is higher than about 1.5:1 when tuning farther than 100 kHz from an antenna's programmed preset point, push and hold TUNER for 1 sec. to start manual tuning. • The internal tuner may not be able to tune in AM mode. In such cases, push and hold TUNER for 1 sec. to manually tune. • MANUAL TUNING • AUTOMATIC TUNER START (HF bands only) During SSB operation at low voice levels, the internal tuner may not automatically tune correctly. In such cases, manual tuning is helpful. ➥ Push and hold TUNER for 1 sec., to start manual tuning. • A side tone is emitted and [TUNER] switch indicator blinks red while tuning. • If the tuner cannot reduce the SWR to less than 1.5:1 after 20 sec. of tuning, the [TUNER] switch indicator goes out. 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 exceeds 1.5:1. This function is controlled in set mode. (p. 12-13). 10-6