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Ham Radio . Magnum Experimentum

Antennas, experiments, engineering and other articles of interest to radio folks.

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half wave

Articles about the half-wave radio antenna.

Electrically isolated end-fed vs. center-fed dipole radiation

January 1, 2021June 3, 2019
Measured magnetic field in vicinity of no-feedline end-fed and center-fed 10 MHz dipoles.

Testing confirms an end-fed dipole can energize the radiator nearly as well as a center-fed without need of additional counterpoise or other extraneous conductors.

Categories Antennas Tags center-fed, dipole, EFHW, end-fed, half wave, measurement, raspberry pi

Displacement Currents

September 17, 2018January 18, 2017
Kirchhoff's current law as boundaries.

Displacement current explains why the ends of dipole antennas have something more than zero current.

Categories Antennas Tags dipole, EFHW, half wave

The dipole antenna, how industry defines it

July 8, 2019April 28, 2016
All dipole antennas... according to the IEEE

Is a dipole antenna defined by its behavior alone or also how one energizes it? The answer exists in IEEE and historical literature.

Categories Antennas Tags center-fed, dipole, EFHW, EIA-329, end-fed, half wave, IEEE, offset-fed, TIA-329

EFHW LNR Precision EF-10/20/40MKII Test Data

May 18, 2019April 16, 2012
SWR Measurements of LNR Precision EF-10/20/40 End Fed Antenna

Basic tests of the LNR Precision EF-10/20/40 multi-band portable HF EFHW antenna including S11, SWR and a bandwidth check of the match box.

Categories Antennas, Reviews Tags 10m, 20m, 40m, EFHW, end-fed, half wave, LNR Precision, measurement

EFHW LNR Precision EF-10/20/40MKII Examination

May 22, 2018April 15, 2012
Schematic of LNR Precision 10/20/40 Portable Antenna Matchbox

The background and details of the LNR (Par Electronics) EF-10/20/40 end fed half-wave multi-band portable HF antenna. Come see what’s inside the mysterious “black box.”

Categories Antennas, Reviews Tags 10m, 20m, 40m, EFHW, end-fed, half wave, LNR Precision, NEC, portable, QRP, Simulation

1/2 Wave vs. 5/4 Wave VHF EZNEC Shootout

November 3, 2018December 16, 2008

Longer is not always better in the world of antennas. Such is the case of the 5/4 wave vertical antenna… a Super J-Pole Wannabe Antenna.

Categories Antennas, NEC Shootouts Tags 2m, 5/4 wave, 5/8 wave, collinear, full wave, half wave, J-Pole

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2m 6m 10m 15m 20m 40m 43 foot 70cm 80m AHVD APRS Baluns battery BigIR copper Diamond dipole DX-Eng. EFHW Elecraft end-fed EZNEC Field Day Golden Packet hexbeam J-Pole Kenwood kj4faj KX3 kx4o measurement mobile NEC NMO NVIS packet PL259 QRP sdr Simulation SteppIR UHF vertical dipole verticals VHF

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