coil q pi
6 links
Antennas : End-Fed : End Fed Half Wave Antenna
- End Fed Half-Wave Antennas
- An interesting article on end fed half-wave wire antennas with a couple of original experiments.
Author illustrate the role of the QRP matchbox, and a 40/20 meter antenna with a center stub making it a large bandwidth antenna for 40 and 20. Includes also an 80/40 end fed with the typical coil to make it available on 80 merts band.
[ Hits: 288 | Votes: 2 | Rating: 10 ]
- DIY Portable Car Whip Antenna
- Being frequently away from home, the author owner of an Elecraft KX3 missed the opportunity to work /M. They devised a portable antenna solution, incorporating a coil and car body, enabling multi-band tuning. Despite its unconventional design, the antenna exhibits promising performance, resembling a vertical dipole.
[ Hits: 54 | Votes: 0 | Rating: 0 ]
- Petlowany Antennas by K6NO
- WorldRadio Article on Petlowany antennas base on this principle: if a length of wire is wound into a spiral-shaped coil and excited by a radio frequency current connected to the innermost portion of the coil, it will then, and only then, exhibit RF characteristics that closely approximate those of a resonant linear wire of the same length
[ Hits: 3765 | Votes: 9 | Rating: 6.22 ]
- The Squid Pole Wire Antenna Re-visited
- The author explores enhancing the performance of a 7-meter fiberglass squid pole wire antenna for amateur radio. The wire, resonant at 10MHz, poses impedance challenges on various bands. Experimenting with direct coax feed and UN-UN transformers, the LDG Z11-Pro2 auto-tuner is found effective but may show deceptive SWR readings. The author employs adjustable UN-UN ratios and introduces a custom "porcupine" coil to optimize the antenna's efficiency.
[ Hits: 91 | Votes: 0 | Rating: 0 ]
- Inductor Calculator
- Calculate inductance online, with the cylindrical Coil Inductor Design Equations Formulas Calculator
[ Hits: 279 | Votes: 1 | Rating: 1 ]
- Grip Dip Oscillator
- Originally eveloped by I1FLC, uses seven plug in coils covering 3.0 to 30Mhz in a Colpitts oscillator circuit.
[ Hits: 667 | Votes: 1 | Rating: 10 ]
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