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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
  • Amateur Radio, Why?
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    • Contact
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    • Advertise
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    • Activities
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    • contesting
    • Connectors
    • Digital Modes
    • EmComm
    • Installations
    • interfaces
    • Introspection
    • Lab Shootouts
    • Miscellaneous
    • mobile
    • NEC Shootouts
    • News
    • Operating Tips
    • power supply
    • Accessories
    • Promoting
    • Propagation
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12m

Articles including references to the 12m WARC amateur radio band.

Build this Vertical Portable HF Antenna

June 14, 2018July 19, 2013
This antenna fits into a baseball bag except for the tripod.

The Asymmetrical Hatted Vertical Dipole (AHVD) prototype is an easy to build, portable alternative to other freestanding vertical HF antennas such as the Buddipole.

Categories Antennas Tags 10m, 12m, 15m, 17m, 20m, AHVD, asymmetrical, DX-Eng., kj4faj, kx4o, measurement, NEC, portable, resin support blocks, Simulation, speaker stand, vertical dipole

Asy Hat Vertical Dipole

April 8, 2020July 14, 2013
Three views showing a how a planed vertical need not always be the classic 1/4 wave monopole.

We re-introduce the theory and origins of Cebik’s (W4RNL) Asymmetrical Hatted Vertical Dipole (AHVD) antenna with the hope to facilitate a vertical polarization portable 20-10m aerial for portable operations.

Categories Antennas Tags 10m, 12m, 15m, 17m, 20m, AHVD, asymmetrical, Bravo, dipole, DX-Eng., kx4o, NEC, Simulation, vertical dipole, verticals

Hexagonal (Hex) Beam Battle

June 2, 2018August 17, 2009

“Put a Hex on you…” Three antenna suppliers are making the Hex Beam antenna an easier choice for your next 20-10 meter beam.

Categories Antennas Tags 10m, 12m, 15m, 17m, 20m, beam, DX-Eng., G3TXQ, hex, hexbeam, K4KIO, Traffie

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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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