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Ham Radio . Magnum Experimentum

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

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    • EmComm
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Slim JIM

Articles discussing Fred Judd’s (G2BCX) BCX Slim JIM variation of the J-pole antenna.

Nelson Antennas 2m rollup antenna review

January 20, 2021January 10, 2021
Nelson Antennas rollup 2m antenna

Review of the smallest portable 2m antenna on the market producing full size dipole performance and stows into your pocket.

Categories Antennas, Reviews Tags 2m, hiking, J-Pole, portable, Slim JIM

J antenna and variations thereof

February 22, 2018February 21, 2018
J antenna an variations thereof

There are many ways to morph the basic J antenna into useful forms.

Categories Antennas Tags collinear, J, J-Pole, Slim JIM, Super J

N9TAX 2m Slim Jim Antenna Review

January 1, 2021June 29, 2017

Erroneous specs aside, the N9TAX VHF SlimJim antenna is an exemplary dipole.

Categories Antennas Tags J-Pole, measurement, N9TAX, Slim JIM, VHF

Decibel hell & the reign of antenna gain pain

March 6, 2017February 13, 2017

A short history of antenna gain terminology and some guidance to muddle your way through some of the nefarious alternative facts you may encounter.

Categories Antennas Tags bel, CP22E, dB, dBd, dBi, decibel, Diamond, directivity, gain, isotropic, LPFM, M2, neper, Slim JIM

Antenna pattern plots: Good intentions vs. good data

January 1, 2021May 31, 2016
Just say no to handcrafted data graphs

In the 21st century should we believe antenna graphical gain data based on hope and hearsay? J-pole antenna gain drawings are a common bad example.

Categories Antennas Tags G2BCX, J-Pole, measurement, Slim JIM

SlimJIM and Antenna Gainflation

June 21, 2018May 26, 2016
E-plane gain plots of J antenna variations

Understanding why SlimJIM antenna aficionados hype the gain in their marketing and discussions.

Categories Antennas Tags collinear, G2BCX, J-Pole, measurement, NEC, Simulation, Slim JIM

Slim Jim vs. Traditional J-pole Antenna

February 27, 2022August 19, 2015
Measured gain of SlimJIM and J-Pole

Real measurements of a Slim Jim antenna and traditional j-pole antenna reveal the truth about their respective gain and pattern.

Categories Antennas Tags 5/8 wave, copper, dipole, HFSS, Hoverman, J-Pole, Lindenblad, measurement, NEC, Simulation, Slim JIM

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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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