This manual describes the operation and service information of the Icom AT-180 automatic antenna tuner
The Icom AT-180 automatic antenna tuner is designed to match the IC-706MKIIG transceiver to a connected antenna automatically. It memorizes variable capacitor angles for each frequency range, allowing for automatic presetting when changing frequencies. The device supports both HF and 50 MHz bands but cannot be used for the 144/430 MHz bands. Users must ensure an antenna is connected before transmitting to prevent damage.
| Frequency coverage | 1.9-54 MHz |
|---|---|
| Input impedance | 150 Q |
| Maximum input power | 1120 W |
| Minimum tuning power | 8W |
| Matching impedance (HF band) | 16.7—150 Q |
| Matching impedance (50 MHz band) | 20-125 Q |
| Tuning accuracy | Less than SWR 1.5:1 |
| Insertion loss | Less than 1.0 dB |
| Power supply | 13.8 V DC/1 A |
| Dimensions | 167(W) x 58.6(H) x 225(D) mm |
No, the AT-180 cannot be used for the 144/430 MHz band.
The tuner tunes the antenna automatically during transmission when the antenna SWR is higher than 1.5:1.
The tuning accuracy is less than an SWR of 1.5:1.