antenna 40 m
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Antennas : 40M- Helically wound antenna for 40m
- A helically wound vertical antenna experiment. 14 meter of wire wounded on a 8 meter fishing pole with 4 elevated radials
[ Hits: 538 | Votes: 2 | Rating: 9 ]
- Delta Loop DX Antenna for 40 meters band
- A monoband delta loop antenna for the 7 MHz. This vertically polarized DX Antenna is a full wavelength sngle side antenna and has a total length of 42.3 meters (137,1 inch) Can be easily setup with a flag pole or fishing pole as center top mast. For optimal performance lower side should be at 2 meter above the ground. This antenna offers a low radiation angle and 1 DB Gain.
[ Hits: 431 | Votes: 3 | Rating: 6.33 ]
- Delta Loop for 40 and 20 meter Band by UR0GT
- This wire antenna for 40 and 20 meter band feature a good SWR. Horizontal side of the antenna is placed at two meters above the ground. Impedance of the antenna are depending by the height of the base from the ground and conditions of the ground
[ Hits: 533 | Votes: 5 | Rating: 7.8 ]
- Shortened 80m Antenna
- An antenna for 80 meters band for those who does not have enough space to setup a halwave wire dipole that is aprox 130ft or 40 meters. The antenna is an open-wire-fed shortened dipole
[ Hits: 420 | Votes: 1 | Rating: 1 ]
- The Antenna Torque Calculator
- This unique online tool helps Ham Radio operators to choose the right rotator for medium and large HF antenna systems. The algorithm implemented in this calculator is the result of 40 years of experience in the HF Antenna sector. Given the Wind Speed, the total antenna square area, and the boom length, it will return the calculated torque value.
[ Hits: 178 | Votes: 1 | Rating: 1 ]
- 50:450 Ohm (9:1) Balun for vertical antennas
- A page describing how to home made a custom 9:1 balun for a common portable wire antenna. The author suggest to use 4C65 or FT140-61 toroids instead of the common Amidon T200-2
[ Hits: 516 | Votes: 11 | Rating: 6.72 ]
- Trapped Dipole Antenna for 20-30-40m
- An 20 30 40 meters trapped dipole antenna plan for sota and portable operations.
[ Hits: 266 | Votes: 1 | Rating: 10 ]
- End-Fed antenna for 17 and 12 meters
- Article about an end-fed anntenna for the 17 and 12 WARC Bands. 30 meters is not included in this project. This antenna includes a 14 windings unun impedance transformer using a FT-140-43 ferrite toroid, that should be enought for a 100W PEP.
[ Hits: 539 | Votes: 3 | Rating: 4.33 ]
- End-Fed HalfWave Matching Unit for SOTA operations
- An end-fed half wave antenna matching unit made of 3:24 turns ratio on a FT140-43 toroid with a 150pF capacitor across the input.
[ Hits: 259 | Votes: 0 | Rating: 0 ]
- The KL3JM modified SRI Fan Dipole for 80-40-20 Meters
- The antenna in this project is a modification of the techniques used to design a multiband fan type dipole with little or no tuning involved having a total space of 105 feet
[ Hits: 500 | Votes: 1 | Rating: 5 ]
- Half Wave Fan Dipole Antenna
- Amateur Radio 40m 20m 15m Half Wave Fan dipole antenna project with part list, pictures and drawing. Includes the option to expand the antenna to cover the 80 meters band
[ Hits: 678 | Votes: 1 | Rating: 1 ]
- 6 Bands Fan Dipole Antenna
- Extension to an existing fan dipole originally modeled for 40 20 and 6 meters. This modification will add 80 15 and 10 meter bands.
[ Hits: 1297 | Votes: 2 | Rating: 5 ]
- Fan Dipole Antenna for 40 20 and 6 meters
- A fand dipole antenna home made for the 7,14,50 MHz.
This article descbribes how to homebrew the antenna, hot to setup and some SWR measurements.
[ Hits: 326 | Votes: 0 | Rating: 0 ]
- Homemade 2M/440 J-Pole Antenna
- A 2m 70cm Dual Band J-Pole antenna for 35 USD.
An excellent performing J-Pole type antenna, constructed from readily available materials.
[ Hits: 1044 | Votes: 5 | Rating: 3.4 ]
- Portable Vertical Antenna
- A home made portable vertical antenna, that with a single 1/4 wave counterpoise wire is possible to achieve less than 1.5:1 SWR on 40, 30, and 20 meter bands. It is basically a center load, shortened ground plain vertical antenna.
[ Hits: 362 | Votes: 0 | Rating: 0 ]
- Dish Antenna for 2.4 GHz Satellite Reception
- Modified 80cm Offset Dish for 2.4 GHz Satellite Reception. This 50-ohm impedance antenna allows, when connected to 2.4GHz preamplifier and downconverter, to receive Amateur satellites with 2.4GHz transponders such as AO-40.
[ Hits: 317 | Votes: 1 | Rating: 5 ]
- DIY Dual Band 144-440 MHz vertical antenna
updated
- A homemade VHF/UHF vertical antenna made essentially with RG58 coax cable, with a 9 turns choke balun to prevent the shield acting as a RF Radiator.
[ Hits: 1367 | Votes: 14 | Rating: 5.5 ]
- A 40m-10m vertical antenna with elevated radials
- A multiband vertical antenna for HF bands with elevated ground radials slant down at 45 degrees and acting also as guy wires.
[ Hits: 540 | Votes: 1 | Rating: 6 ]
- Cobra Antenna - A folded dipole
- A wire dipole antenna for the 80 and 40 meters band obtained by folding elements of a dipole and feeding with a 1:4 balun.
[ Hits: 1052 | Votes: 5 | Rating: 6.8 ]
- Cushcraft R8 Vertical Project
- 40/30/20/17/15/12/10/6 Meters antenna setup and assembly with high res pictures of the R-8 Antenna
[ Hits: 278 | Votes: 0 | Rating: 0 ]
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