November 1, 2025
AT-3K Tuner Operating Manual Description The Model AT-3K Antenna Tuner is a precision-built, compact, high-performance instrument of advanced design, providing maximum possible flexibility for the operator. The AT-3K is equipped with an inline relative power SWR meter showing simultaneously forward and reverse power on two separate precision meters, with front panel sensitivity control for SWR calculation. The AT-3K has been designed to match any transmitter (3000 watts P.E.P maximum) to a multitude of antenna systems, including three coaxial lines, a long wire system, and a balanced feed line with optional balun. There is also a switch position for a Dummy Load such as a DenTron Big Dummy, which can be used to tune up without on-air interference. The AT-3K will tune any of these systems from 1.8-30 MHz and it will handle a full 3kw P.E.P. Built modularly, the AT-3K makes the ideal addition to any HF communication system operating between 1.8-30 MHz. AT-3K Specifications Frequency Coverage: 1.8-30 MHz Continuous Input Impedance: 50 ohms (Resistive) Output Impedance: Coax 1 50 ohms nominal Coax 2 50 ohms nominal May range from a few ohms to a high impedance. Coax 3 50 ohms nominal Long Wire either High or Low Impedance…
