mra antenna

73 links

Delta Loopy Ideas - Setting up a portable wire delta loop antenna with an MFJ 33ft telescopic fiberglass pole
[ Hits: 104 | Votes: 0 | Rating: 0 ]

Field-Tested VP2E Antenna - The author explores the VP2E antenna, introduced by Ed Durrant DD5LP, for Portable Operations on the Air (POTA). Detailing its unique design, successful trials, and an unexpected propagation twist, the VP2E proves a promising addition to the author's portable antenna arsenal.
[ Hits: 521 | Votes: 5 | Rating: 4.8 ]

End-Fed Half-Wave Antenna for 20m 40m 80m - How to Design and Build a Field Expedient End-Fed Half-Wave Antenna for 20m, 40m and 80m. This Shorty 80m EFHW comprises a 49:1 autotransformer (to match the very high impedance at the end of a half-wave wire), a half-wavelength wire for 40m (also a quarter-wavelength for 80m), a loading coil and a short tail wire. The coil and the short tail wire (about 6 feet) make up the other quarter wave on 80m.
[ Hits: 141 | Votes: 1 | Rating: 4 ]

How to find out if your choke works - How many times have you heard the advice to coil a few turns of coax at the antenna end to form a choke. How to find out if your common mode current choke really works
[ Hits: 211 | Votes: 1 | Rating: 9 ]

Slim Jim vs. Traditional J-pole Antenna - A comparison among a traditional J-Pole Antenna and 2BCX Slim Jim Antenna
[ Hits: 167 | Votes: 0 | Rating: 0 ]

Telescopic Fiberglass Antenna Pole Support Method - Supporting a telescopic fiberglass antenna pole for ham radio operation. Rather than cumbersome methods like using angle iron or PVC pipes, author employs lightweight tent stakes, toggles, and paracord to secure the pole effectively. With careful knot tying and simple materials, he ensures rapid deployment and stability even in windy conditions, offering a practical solution for outdoor antenna setups.
[ Hits: 137 | Votes: 0 | Rating: 0 ]

Build this Vertical Portable HF Antenna - An experimental prototype of an asymmetrical hatted vertical dipole antenna that can work on HF bands 20 to 10 meters band. The AHVD Vertical dipole is an upside-down T design
[ Hits: 374 | Votes: 3 | Rating: 9.67 ]
A Compact and Stealthy Field Portable Antenna - In the quest for an ideal field portable antenna, the author recounts experiments involving various wire configurations. While a previous candidate, a 41ft random wire, proved effective but lacked stealth, the search led to a surprising rediscovery of a design previously rejected—the Rybakov Antenna. With a focus on simplicity, rapid deployment, and multiband capability, the author explores the versatility of a 26ft Rybakov, avoiding the halfwave trap. The article delves into the antenna's performance and its potential as a discreet, resonant solution for field operations, addressing the challenges encountered during a POTA activation. Additionally, the Unun/Balun design used in conjunction with the Rybakov Antenna is discussed, providing insights into achieving a balanced system.
[ Hits: 153 | Votes: 1 | Rating: 1 ]

The Weird Antenna Wire End Effect - A half wave wire that is tuned for resonance on 80m will NOT be resonant on 40m despite a precise harmonic relationship between the two bands. The End Effect is caused by a capacitive coupling between an unterminated wire end and the ground.
[ Hits: 95 | Votes: 0 | Rating: 0 ]

Wire on the Ground: Portable Radio Success with Grasswire Antenna - The author shares a unique experiment with a 200ft Grasswire antenna—laying wire directly on the ground. Despite inherent losses, the setup enables successful radio communication with a Kentucky station, highlighting the antenna's practicality for portable use with minimal power.
[ Hits: 103 | Votes: 0 | Rating: 0 ]

A Magic Ground Mobile Antenna - Experimenting and testing vertical antenna for HF bands on mobile operations.
[ Hits: 113 | Votes: 0 | Rating: 0 ]

Ham Radio And the Art of Bushcraft - This article explores the marriage of amateur radio and bushcraft, advocating the pleasure of setting up a portable station in nature rather than operating from the confines of a vehicle. The Parks on the Air (POTA) programme is highlighted as a catalyst for outdoor radio activities. The author shares his experiences and techniques, from transporting equipment into the wilderness to setting up shelters and antennas. Knot tying skills and the use of frogs are emphasized for efficiency, and a unique method for launching wire antennas is described. The article emphasizes the synergy between amateur radio and bushcraft skills, enhancing the enjoyment of radio operations in wilderness environments.
[ Hits: 83 | Votes: 1 | Rating: 10 ]

DIY Tree Antenna Launching: Cheap and Effective - This article explores budget-friendly methods for launching wire antennas into trees, comparing common options like slingshots and professional arborist tools. The author introduces a simple and cost-effective DIY approach using latex balloons, sand, and readily available materials for efficient antenna deployment in the field
[ Hits: 120 | Votes: 0 | Rating: 0 ]