ICOM AH-705 Automatic Tuner for IC-705

The AH-705 matches the IC-705 exactly - in size, low power consumption and technical specifications. The tuner matches all coax-fed antennas, for example end-fed wires with balun, or even a dipole at the edge of resonance. Exactly what you need for portable operation.

The  tuner fits perfectly into the LC-192 backpack, which has a compartment at the top for the transceiver. So you always have everything at hand. The AH-705 is powered either by built-in alkaline batteries (2 x size 'AA' or 'LR6') not incluid or by an external 12V power supply. The power consumption is approx. 1 mA at rest and approx. 300 mA during tuning. As usual with automatic tuners, once found tuning steps are stored in an internal memory. This speeds up the re-tuning process considerably.

The scope of delivery includes a control cable (2x 3.5mm jack plugs) and a coaxial cable (2x BNC plugs), both cables are approx. 2m long. This allows you to mount the tuner close by, for example on a small mast. For mounting, a bracket is included in the delivery, which can be screwed onto the tuner. With this tuner and a strap or cable tie, the tuner can be mounted quickly. The European version comes with a PL plug (PL-259) .

A long piece of wire or a good and short earth connection is recommended as a counterweight. Antennas can be dipoles or end-fed wires, but also tuned verticals that should be operated slightly outside the resonance. Operation on the 160 m band requires an antenna with at least 30 m length, on bands from 80 m an antenna with at least 7 m length is suggested. The tuner can be used on the frequencies 1.8 to 54 MHz. A power of approx. 5 W is required for tuning, max. transmit power 10 W.

Specifications

Tunable frequency range: 

1.8 – 54 MHz (with a 30 m, 98.4 ft or longer wire antenna)

3.5 – 54 MHz (with a 7 m, 23 ft or longer wire antenna)

Maximum input power: 10 W

Input impedance: 50 Ω

Power requirement for tuning: 5 W, 10 W

Tuning time (approximate) Average: 2 – 3 seconds

Maximum: 15 seconds

Power supply requirement Battery: 3.0 V DC (LR6 (AA) alkaline × 2 cells)

DC Input: 13.8 V DC (±15%)

Current drain Less than 300 mA (at tuning)

Less than 1 mA (stand-by)

Electric polarity: Negative ground

Operating temperature range: –10°C to +60°C, 14°F to +140°F

Tuning accuracy: Less than 1: 2.0 VSWR

(except λ/2 of antenna length and its multiples)

Number of tuned memories: 45 memories

Dimensions (W × H × D) (projections not included): 190 × 105 × 40 mm; 7.5 × 4.1 × 1.6 in

Weight (approximate): 450 g, 15.8 oz (battery cells are not included)