spiral
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- ZMV Spiral antennas
- An experimental antenna similar to the TAK spiral antenna was evaluated for SWR response
over the frequency range of 7.0 to 7.3 MHz, or the 40-meter band.
[ Hits: 3431 | Votes: 8 | Rating: 5.37 ]
- Spiral Dipole Antenna for 40m
- This antenna is an off-center fed spiral dipole for 40 meters. The spiral dipole is very compact, making it well-suited for limited space (like an apartment patio), while the off-center feed gives the antenna some multiband capability.
[ Hits: 291 | Votes: 3 | Rating: 7 ]
- 80 meters spiral loop antenna
- N4SPP 80 meters band spiral loop antenna based on SM0VPO design
[ Hits: 5249 | Votes: 10 | Rating: 7.1 ]
- The normal-mode helix antenna
- A helix will work in the normal mode when the diameter and pitch of the helix is less than 0.1 Lambda
[ Hits: 3054 | Votes: 7 | Rating: 5 ]
- The Indoor spiral dipole
- An attic indoor antenna successfully implemented by N9RET by using two runs of 2-conductor wire
[ Hits: 4508 | Votes: 2 | Rating: 5.5 ]
- Antennas for 136kHz
- Extensive article on building antennas for the 136 Khz band covering several aspects of antennas for the 136 kHz band including Vertical monopole antenna, Short vertical monopole, Vertical antenna with capacitive toploading, Umbrella antenna,
Capacitive toploading of single-tower antennas and Spiral toploaded antenna
[ Hits: 1703 | Votes: 8 | Rating: 5.99 ]
- Archimedean Spiral Antenna for RTLSDR
- Dodgy plans to make Archimedean spiral antenna for RTLSDR software defined radio receiver. Made of two equal lengths of coaxial cable seems to be the easiest circularly polarized antenna to make that will cover a broad range of the rtlsdr dongles E4000 tuners
[ Hits: 1031 | Votes: 2 | Rating: 10 ]
- 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 ]
- N0LX Petlowany Antenna Experiment
- An attempt to modify and try out the unusual antenna first described by Bill Petlowany, K6NO, in World Radio Magazine
[ Hits: 2361 | Votes: 6 | Rating: 7.5 ]
- Spiral Antenna Theory
- Spiral antenna belong to the class of frequency independent antennas. Antennas with a very large bandwidth.
[ Hits: 1129 | Votes: 1 | Rating: 8 ]
- Spiral antenna for RTLSDR
- A spiral antenna experiment for RTL SDR usage.
[ Hits: 1011 | Votes: 3 | Rating: 7.33 ]
- Spiral Dipole Antennas
- Experiments with spiral dipole antennas. Includes two spiral antenna designs for 20 and 40 meters band by KN9B
[ Hits: 1164 | Votes: 3 | Rating: 10 ]
- Spiral Antenna for SDR
- Designing and Testing a PCB Wideband Spiral Antenna. The 800 MHz+ and 300 MHz+ spiral antennas by Hexandflex
[ Hits: 91 | Votes: 0 | Rating: 0 ]
- The Petlowany Principle
- Spipral antenna principle by a concept of Bill Petlowany, K6NO. Tak Antennas are based on this principle, using spirals as dipole linear wires.
[ Hits: 864 | Votes: 1 | Rating: 10 ]
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