The AX-81S antenna is a compact active HF antenna, ruggedized to suit harsh outdoor environments, and particularly suitable for marine environments. While it has been designed primarily as a marine antenna, it can be useful anywhere where good HF performance and reliability are required, and where space is at premium. The antenna is receive-only, and is suitable for professional as well as consumer applications.The antenna covers the frequency range of 2 to 30 MHz, or 300 kHz to 50 MHz with somewhat reduced (but still excellent) performance.While designed to be entirely general-purpose, the AX-81S antenna is especially suitable for the WiNRADiO G33EM marine receivers and G3 series of HF receivers.The principal elements of the antenna are constructed of a low-carbon austenitic stainless steel that contains molybdenum. Austenitic (chromium and nickel content) stainless steels have high ductility (i.e. ability of a metal to plastically deform without breaking or fracturing), low yield stress and high ultimate tensile strength, when compared to a typical carbon steel. The 316L grade as used for the AX-81S antenna also offers an especially high degree of resistance to corrosion. The choice of materials and the durable construction of the AX-81S antenna will ensure trouble-free operation for many years.The antenna was designed for rapid installation, with an easy-to-follow installation procedure supplied with the antenna.
Type Active HF antenna monopole
Frequency range 2 - 30 MHz @ 3 dB
(excellent performance from 300 kHz to 50 MHz)
Output IP2 +60 dBm
Output IP3 +30 dBm
Supply voltage 12 V DC (min 10 V, max 14 V),
supplied via the coaxial cable
Note: The WiNRADiO G33EM receiver supplies power for the AX-81S antenna at its antenna input, and no external power supply is needed. For any other applications we recommend using a WiNRADiO SF-41 Low-noise Linear Power Supply together with the WiNRADiO WR-BT-650 Power Injector.
Supply current 40 mA @ 12 V
Impedance 50 ohm
Connector BNC (concealed in body)
Operating temperature -20º to 80ºC
Active element length 1160 mm (3.8 ft)
Active element diameter 3 mm (0.118 in)
Body length 190 mm (7.45 in)
Body diameter 38 mm (1.45 in)
Mounting 1" diameter standard #14 thread
Overall length 1350 mm (4.43 ft)
Weight 550 g (1.21 lb)
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