HF Active Vee Antenna
Cross Country Wireless have released a HF Active Vee Antenna with a frequency range of 200 kHz to 70 MHz.
Recently we were asked by one of our customers to design an active antenna to replace some venerable Cold War era Rohde and Schwartz HF antennas used for HF radio monitoring. The original R&S antenna used an upright vee configuration that allowed ground wave vertically polarised, HF sky wave and NVIS signals to be monitored on one antenna. Our new active antenna uses the same configuration to give similar results in a smaller antenna.
Computer modeling and on-air testing shows that the antenna is elliptically polarised with a vertical component 6 dB below the horizontal one.
Our antenna is a 90 degree upright vee active antenna with a built-in low noise RF amplifier. An ethernet cable is used to connect the antenna to a base unit. This allows 12V power to supply the amplifier while another balanced pair within the cable is used as the RF feeder. The antenna uses isolation transformers to isolate the antenna elements from extraneous RF noise picked up by the feeder cable or from the electrical supply to the base unit.
A hybrid balun transformer in the base unit provides two RF outputs. The antenna power requirements are 10 to 16V at 150mA.
Like our other active antennas the antenna has RF over-power protection on the antenna element and the RF outputs on the base unit.
BNC female connectors are used for the RF output ports on the base unit.
The antenna comes with a mounting bracket and hardware for mounting on Clark Mast or Hilomast telescopic masts using a 25mm Stauff clamp and a 52mm clamp for mounting on 50mm or 2" scaffold poles.
The base of the bracket is flat to allow temporary mounting with clamps or straps on balcony rails or similar.
The antenna is supplied with a 20m outdoor grade ethernet cable.
The antenna is in production.
The HF Active Vee Antenna FAQs can be downloaded here .
A link to a web page with detailed antenna plots and the NEC file for the HF Active Vee Antenna is here .
Due to international shipping restrictions we can only supply the antenna complete with whips to UK customers.
We can supply the antenna without whips to international customers so that they can source the whips locally. The whip diameter is 2.5mm (often sold as 3mm) or 0.1" diameter. Suitable lengths are 1m (39") to 1.3m (51"). Suitable whips are usually used for mobile VHF antennas for cars and vans.
If you require more detailed information please contact us by email at Email address hidden from spambots or phone +44 (0)1204 410626 or +44 (0)7752 391908.
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