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The Icom IC-705 Antenna Tuner AH-705 is a versatile accessory designed for the Icom IC-705 transceiver, enabling efficient tuning across a wide frequency range of 1.8 to 54 MHz. It supports antennas of varying lengths, requiring a 30 m (98.4 ft) or longer antenna for optimal performance in the 1.8 – 54 MHz range and a 7 m (23 ft) or longer antenna for the 3.5 – 54 MHz range. Users should note that under certain operating conditions, the tuner may struggle to achieve a match, and it features an SO-239 connector for 50 Ω antennas, such as dipoles or Yagis.
The AH-705 is designed for convenience, featuring a compact size of 190 × 105 × 40 mm (7.5 × 4.1 × 1.6 in) and a lightweight build of approximately 450 g (15.8 oz). It operates on two power sources: alkaline batteries or an external 13.8 V DC supply, requiring the power to be sourced directly and not through the IC-705. The tuner boasts an IP54 rating for dust protection and water resistance, though users are advised to cover connectors to prevent moisture ingress. Automatic tuning is straightforward, requiring a push of the [TUNER] button, with tuning times averaging between 2 to 3 seconds.
With a maximum input power of 10 W and a tuning accuracy of less than 1:2.0 VSWR, the AH-705 offers 45 memory slots for storing tuned settings. It operates efficiently across a temperature range of –10°C to +60°C (14°F to +140°F) and consumes less than 300 mA during tuning, dropping to less than one mA in standby mode. This tuner is essential for amateur radio enthusiasts looking to enhance their Icom IC-705 experience with reliable and effective antenna tuning capabilities.
