short wave antenna
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Antennas : 40M : 40 meter Dipole Antennas- Half-Length Dipoles for 40 Meters
- Complete collection of the four main parts of this excellet research on modelling and designing half wave dipole antennas for 40 meters band, covering all aspects beginning from full wave length antennas, to shortened, loaded and reshaped dipoles
[ Hits: 382 | Votes: 2 | Rating: 10 ]
- 80m Shortened Dipole Antenna
- This antenna just requires about 24m of free space instead of 41m that a normal half wave 80m antenna needs to hang up. The so called loaded dipole uses a coil in every dipole arm to electrically lengthen the
mechanical too short dipole arms. Every coil has an inductivity of 120 microHenry.
[ Hits: 154 | Votes: 0 | Rating: 0 ]
- Loaded Quarter Wave Antenna Inductance Calculator
- Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. The calculation refers to either a loaded 1/4 wave or a loaded dipole
[ Hits: 163 | Votes: 0 | Rating: 0 ]
- Multi-Band End-Fed Antenna Design for Limited Space
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- This document details the construction of a multi-band end-fed antenna, suitable for situations with limited space for larger antennas. The design utilizes a 1:49 to 1:60 impedance transformer to match a half-wave wire antenna fed at one end. Compared to a traditional dipole, this antenna resembles a highly unbalanced Windom antenna with one very long leg and a virtual short leg. The design eliminates the need for radials but relies on the coax cable shield for grounding. The document recommends using at least 10 meters of coax and installing a common mode filter at the entry point to the shack for improved performance.
[ Hits: 76 | Votes: 0 | Rating: 0 ]
- 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 ]
- Short receiving loop antenna
- This page is a project for a small loop antenna for reception of short wave broadcasting.
It is in Portuguese and contains pictures and schematics to build your own antenna
[ Hits: 120 | Votes: 1 | Rating: 10 ]
- Active 3-30 MHz Hula-Loop Antenna for Shortwave
- This active antenna for the shortwave band provides surprising performance, even indoors. As the name implies, the main loop is made from a Hula-Hoop with the metallic paint stripped off and a single turn of 14AWG copper wire inserted inside the hoop.
[ Hits: 158 | Votes: 1 | Rating: 10 ]
- Dual-Band X-Frame Shortwave RX Loop Antenna
- A dual band X-frame wire antenna made using 4 turns for response down to 3 MHz or so, and 2 turns (switched) for response up to around 18 MHz. The loop configurations are tuned using common eBay 365 pF tuning caps.
[ Hits: 148 | Votes: 1 | Rating: 10 ]
- Midway Electronics
- Midway Electronics supplies the area with electronic components, wire, cables, amateur radio transceivers, QRP kits, CB transceivers, GMRS radios, Shortwave radios, power supplies, antennas, coax, connector and ham radio accessories
[ Hits: 216 | Votes: 2 | Rating: 3 ]
- A 3.5MHz Receiver for SSB and CW
- Homemade receiver for 80 meters band. The receiver works very well (in fact better than some of its successors), especially the AGC makes listening to 80m QSOs a real pleasure. Sensitivity is not cutting-edge, but on a full-size short-wave antenna it is by fare sensitive enough.
[ Hits: 250 | Votes: 2 | Rating: 6.5 ]
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