ACOM 20AT automatic antenna tuner 1.8-30 MHz + 6m 1500 watts

ACOM 20AT automatic antenna tuner 1.8-30 MHz + 6m 1500 watts designed for operation with the Acom 2020S transistor PA. In this combination, the power amplifier and tuner form a perfect team for very convenient automatic operation at high power.

The ACOM 20AT tuner can be used locally in the shack or remotely, up to 100 meters, indoors. This reduces losses, because only the antenna and its relatively short feed line are calibrated by the tuner itself and not the antenna feed line. Control and power are completely via a coaxial cable, without the need for additional cables to the tuner. The frequency range covers the entire shortwave band from 1.8 to 30 MHz and the 6 meter band from 50 to 54 MHz. Maximum power levels of up to 1500 W are possible, depending on the antenna setting.

A maximum of four antennas can be connected to the tuner. The selection of the respective antenna is done manually via the control on the PA or automatically based on the frequency. All inputs are statically protected by double protection against nearby charges and lightning. The antenna connections can also be switched to “bypass”, so you can use an antenna directly without a tuner. The tuning process of the ACOM 20AT tuner is automatic and transparent to the user. It takes a maximum of 5 seconds and usually does not exceed 2-3 seconds. Once you find your tuning settings, they are saved permanently; If you have saved antenna/frequency combinations, the tuning process takes less than half a second. The saved settings can also be exported to a computer and restored later. Up to 1000 memory locations are available. If the PA and transceiver are connected via CAT interface (so that the PA can always follow the operating frequency), the tuner follows the set frequency and also selects the tuning and antenna connection without having to transmit. This CAT connection is optional, it is not required for fully automatic operation.

The tuner has various protection circuits and therefore also protects the output stage.Power supply voltage, polarity, excessive RF voltage, RF current, reflected power, input power, temperature and much more are checked. If the SWR is too low, the tuner reports the error state and the PA reduces the transmit power. At full power, mismatches of up to 3:1 can be compensated; in individual cases it is possible to use antennas with even worse couplings, up to an SWR of 10:1, but in this case operation is only possible at greatly reduced powers. During the tuning process, the 20AT tuner's input SWR never rises above 2:1; as soon as a match is found, the input SWR to the power amplifier does not exceed 1.5:1. The current operating status of the tuner is shown on the PA display, so you always have full control of the entire antenna system, including the power amplifier.