QRO.cz Classic Single Output 2-Wire Bi-Directional Beverage Antenna Systems are designed for efficient direction switching using an internal relay, with control achieved directly over the coaxial cable. When no voltage is present on the coax, the antenna operates in the reverse direction (compared to a single-wire beverage). Applying voltage to the coax switches the antenna to the forward (straight) direction, matching the behavior of a single-wire beverage antenna.

With careful design and construction, a single 2-wire beverage antenna can provide excellent performance in two directions. Unlike single-wire systems that use only a load resistor at the end, this system uses a transformer specifically designed to match the antenna’s impedance. All transformers in the system must be precisely calculated based on the antenna’s physical parameters—such as height, wire spacing, and wire diameter—to ensure optimal performance.

For best results, beverage antennas should be installed at least one wavelength away from large metallic structures like vertical antennas, towers, power lines, or electric fences. The antenna units can be mounted on trees, wooden poles, or fiberglass rods. Do not use metal pipes and never mount the unit with the connectors facing upward.

The parallel wire line used in the antenna must maintain perfectly balanced transmission line conditions. The wires should run parallel to the ground—not vertically stacked using single support poles. The closer the wire spacing, the lower the line’s impedance, which also reduces sensitivity to installation-related imbalances. When using ladder line (300 or 450-Ohm), it should be twisted multiple times along its length to maintain balance.

Included in package

(1) Bi-directional Box - assembled and tested

(1) Bi-directional terminator - assembled and tested

Note: Antenna wire and coaxial cable not included.

Key Features

• Ideal for use as a low band receiving antenna , including:

  • LF (Low Frequency)

  • MF (Medium Frequency)

  • HF SWL (High Frequency Shortwave Listening)

• Lower noise floor and improved directivity for enhanced reception quality

• Can be integrated as part of a phased array system for directional control and gain

Additional Feature and Specifications:

• Usage: RX only

• One Coax Output: with internal relay switch in feeder

• Direction Switch needs + 12VDC / 0.1A (or AC 12V) - switching by positive voltage

• Antenna Reception: REVERSE direction with 0VDC, STRAIGHT with +12VDC

• Feedline Impedance: 50-Ohm

• Antenna Impedance: 600 Ohms

• Broadband Frequency Range: 0.2 to 30MHz

• Bi-directional (reversible) beverage antenna

• Antenna Wire: Uses either twin lead or open wire

• Classic Construction - Antenna in the air

• Isolated Ground: Prevents common-mode noise

• Common-Mode Coax Choke: Included at output

• Common-mode Choke Isolation more than 30dB

• Switchable Direction: By positive voltage (+ 12VDC or AC)

• Electrostatic and HV Protection: With neon lamps (> 65VAC)

• High Power Protection

• High quality connectors, and stainless steel hardware

• Front-end Protection: Input

• Enclosure: IP56 Weather Resistant

• Product Dimensions (WxHxD)

• Bi-directional Box: 3.94 x 3.94 x 1.97in.(100x100x50mm)

• Terminator: 2.56 x 2.28 x 1.38in. (65x58x35mm),

• Weight: 1.08lbs. (0.49kg)