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Ham Radio . Magnum Experimentum

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

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  • Radio Shorthand
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    • Logging Software
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    • Activities
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    • contesting
    • Connectors
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    • EmComm
    • Installations
    • interfaces
    • Introspection
    • Lab Shootouts
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collinear

Discussions about antenna topologies using collinear in-phase elements.

Antenna radiator decoupling stub flub?

February 18, 2019December 29, 2018
The pursuit of the single half-wave at 3rd harmonic.

Measurements and analysis suggest why quarter-wave stubs fail to completely isolate radiator conductors on multi-band antennas including the popular rollup 2m/440 J-Pole products. Possible improvements are shown.

Categories Antennas Tags 2m, 70cm, choke, coaxial choke, collinear, dual-band, inductance, J-Pole, NEC, portable, resistance, Simulation

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

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

Improving the Super-J

May 28, 2016August 5, 2012
Full view of various Collinear J-Poles

The traditional collinear J-Pole, aka Super-J, improves the basic J-Pole. Are further improvements possible? By replacing the phasing stub with a simple coil, the answer is yes. The result is the Collinear J-Pole.

Categories Antennas Tags 2m, APRS, collinear, J-Pole, measurement, NEC, Simulation, VHF

Hiking, Hams and Hills – Station #6 of the AT Golden Packet

November 3, 2018August 2, 2009

Hiking, ham radio, hills and a portable collinear J-Pole combine to make the Golden Packet Test a memorable event.

Categories Activities Tags 2m, APRS, collinear, EZNEC, Golden Packet, hiking, J-Pole, kj4faj, kx4o, NEC, Simulation, TM-700, TM-710

Collinear 5/8 wave J-Pole vs. Collinear 1/2 wave J-Pole EZNEC Shootout

November 3, 2018July 7, 2009

Another 5/8 J-Pole Design arranged as a Collinear… can it justify the complexity and extra materials?

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