The Antenna Tunning unit (ATU), or coupler, couples the 50 Ohm output of the transmitter to a Symmetrical "T" or Tower type antenna.
The coupler consists of an impedance transformer, large tapped coil with a rotatable tuning ring, meter circuit, Remote Antenna current sense circuit and an Autotune circuit. The rotatable tuning ring is driven by a motor that is controlled by the Autotune circuit, or manually by switches. The coupler is mounted in an aluminum, weather tight enclosure and is designed for outdoor installation.

Size: 22.5in (57cm) wide, 21.5in (55cm) deep, and 26.5in (67cm) high

PC-1000C3 ATU

The PC-1000C3 Antenna tuning unit is designed to match 200 - 1500pF / 2 - 25 Ohms antenna load in the 190 - 625 kHz frequency range, RF input power is 200 Watts continuous, 500 Watts peak.
The coupler has an auto-tune feature which automatically maintains system tuning during changing environmental conditions.
The unit is housed in an IP66-Certified aluminum enclosure for all weather operation. Operating power is supplied by SAC transmitter or optional 115/230VAC internal power supply.

PC-3000 ATU

The PC3000 antenna coupler links the 50 Ohm output of the transmitter to a “H” Antenna with a minimum of 200ft (61m). It consists of an impedance transformer, a large tapped coil with a rotatable shorted ring, and a meter. The shorted ring is driven by a motor that is controlled by the Autotune PCB inside the coupler.
TThe PC-3000 Antenna tuning unit is designed to match 700-1500pF/2-25 ohms antenna load in the 190 to 625 kHz frequency range, RF input power is 600 watts continuous, 1500 watts peak.The coupler has an auto-tune feature which automatically maintains system tuning during changing environmental conditions.
The optional coupler power supply furnishes 12 VDC for operation of the autotuning system and metering circuits. The power supply operates from 85-264 VAC, 47-63 Hz, and is required when the coupler is used with transmitters not manufactured by Southern Avionics Company.

PC-5Kilo ATU

The PC 5Kilo ATU is for higher transmit power of up to 1000W. The frequency range 190 - 535 KHz with a 700 to 1500 pF load. The AU consists of a large coil with coarse taps and fine taps and a rotatable tuning ring. The coarse tap is selected with a solder connection behind an access panel. The fine tap is selected with a 10 position switch. The autotune system drives the tuning ring for exact tuning. Inductance range is 25 uH to 1 mH.

Please see below "ORDERING INFORMATION" for diffrent options and relevant part numbers.