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The EASP-WHF1K-ANT is a relative high efficiency broadband vertical radiator intended for use with frequency agile transmission systems over the 2 - 30 MHz HF band (i.e.: HF/ALE systems).

It is produced in two different versions, respectively EASP-WHF1K-ANT/R for the roof mounting solution and EASP-WHF1K-ANT/N for the naval mounting solution.

  • Minimal maintenance requirements
  • High Reliability
  • Broadband radiator, a decade frequency interval typical
  • No tuning devices
  • SWR 1:1.5 typical
  • 50 ohm coax feed line
  • RF power 1.0 kilowatt continuous duty
  • Rugged fiberglass whip element and stainless steel mounting hardware

A vertical radiator can be matched to a 50-ohm feed line by an inductive (L), a capacitive (C), or an L/C system. An HF line with its end, either open or shorted, can be an "L", a "C", or an "L/C" matching system, depending on the ratio of its length to a given wavelength. A coax stub can therefore replace most matching systems.
A very long coax stub, several wavelengths long, can be used as a multiband-tuning-system in the HF range. This long line almost always offers a correct match for each frequency, and a good match of the vertical radiator to the feed-line. This arrangement needs some matching transformers within the feeder and the tuning line. This technique is used in conjunction with a virtually infinite length of an aperiodic transmission line.
Such unique arrangement of lumped and distributed elements network provide 50 ohm impedance adaption over the entire HF band.

Physical layout

The antenna is constituted by the 10 meter whip sustained by ATU that performs also as support. The impedance adaptor, along with transmission line transformers, is mounted in an aluminum enclosure with integral heat sink.

Length 10 meters
Weight 40 Kg
Sections 2
Bottom Ø 62 mm
Whip material epoxy fiberglass
Finishing polyurethane paint
Colour grey RAL 7030
Radiator high Q Teflon line
Ferrule inox steel per AISI 316
Operating temperature -35°C to +80°C
Max wind speed 180 Km/h
Frequency 2 to 30 MHz
Impedance 50 ohm
Polarization Vertical
H radiation 360°
V radiation See diagram
TX feed cable RG-213/U
Ground Yes
Model Number Description
EASP-WHF1K-ANT/N Wide band HF antenna 1KW - Naval Mounting
EASP-WHF1K-ANT/R Wide band HF antenna 1KW - Roof Mounting