hf antennas

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hf antennas

302 links - and 14 categories

Antennas : 2M
  • VHF Bi-Square Beam Antenna - 2 Wavelength ,2 Meter Bi-Square Beam , 5dbd gain. This antennas are very cheeap to build and their radiation pattern is similar to a figure 8 with maximum signal through the loop but they may be used as a near-omnidirectional antenna
    [ Hits: 185 | Votes: 2 | Rating: 9 ]
Antennas : Antenna Calculators Antennas : Baluns
  • Build your own HF balun - A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cable. From the RF point of view, the shield can be modeled as two conductors, the internal shield (the real shield, this is, ground) and the external shield, who is really far to be ground. In this way, your dipole has 3 arms, the two from the dipole and the coaxial cable shield (external face)
    [ Hits: 248 | Votes: 1 | Rating: 10 ]
  • BalUn for Delta-loop & Quad-loop antennas - This Guide helps you to build the 1:2 BalUn 600 Watts DIY kit step by step. If a delta-loop or quad-loop antenna is powered with a coax cable from the transceiver it is necessary to use a 1:2 BalUn. This 1:2 BalUn uses a symmetrical 1:2 impedance transformer.
    [ Hits: 285 | Votes: 1 | Rating: 9 ]
Antennas : Dipole
  • Small HF Antennas - Experiments on HF antennas for restricted spaces. In this article author experiments antennas for 80-10 meters band having just a very small garden and several restrictions. Basic antennas consists of laded multiband dipoles and fan dipole antennas
    [ Hits: 1014 | Votes: 19 | Rating: 7.31 ]
Antennas : Horn
  • What is Horn Antenna - Horn Antenna - The energy of the beam when slowly transform into radiation, the losses are reduced and the focussing of the beam improves. A Horn antenna may be considered as a flared out wave guide, by which the directivity is improved and the diffraction is reduced. One of the first horn antennas was constructed in 1897 by Bengali-Indian radio researcher Jagadish Chandra Bose in his pioneering experiments with microwaves. The modern horn antenna was invented independently in 1938 by Wilmer Barrow and G. C. Southworth. This Horn model antenna is suitable employed in the UHF or SHF radio bands. Making this horn model antenna it will be easy for a beginner to make if it works in the 10GHz frequency, because small dimensions so it is not so difficult and also offers gain up to 25dBi.
    [ Hits: 74 | Votes: 0 | Rating: 0 ]
Antennas : Magnetic Loop
  • Magnetic Loop HF antenna - An homebrew HF Magnetic loop made with 2m length of 6mm diameter copper pipe formed into a near circle as the low loss inductor, a short length of coax as a capacitor,a short length of mains cable, again as a fixed tuned capacitor, a tunable 365pF air spaced capacitor, and a small Jackson C804 airspaced variable with a small 3-35pF trimmer in parallel
    [ Hits: 130 | Votes: 0 | Rating: 0 ]
Antennas : Portable
  • Portable HF Antenna Options - Article on portable HF antenna where author diverge about antenna efficiency versus size based on his personal experience on using HF antennas during portable operations
    [ Hits: 174 | Votes: 2 | Rating: 4 ]
  • 2 Meter Portable Yagi Antenna - 144MHz 2m Portable Yagi VHF Beam Antenna. This page contains construction details on a 2 metre 144MHz VHF Yagi beam antenna, designed for portable use.
    [ Hits: 135 | 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: 373 | Votes: 3 | Rating: 9.67 ]
Antennas : Receiving
  • HF Receive Antenna - This page describes a couple of parts box medicine bottle antennas that you can build. The ground side of the capacitor is soldered to the ground of the BNC connector. The positive side of the capacitor takes 5 turns around the toroid and is soldered back to itself. The center pin of the BNC connector takes 5 turns around the toroid and then continues on to the wire wound inductor. From there the antenna continues with an attached piece of wire.
    [ Hits: 189 | Votes: 2 | Rating: 3 ]
  • Small HF RX Loop - This is very common W7IUV Flag Antenna design is based on the PY3AGD antenna because it uses the antenna mounted horizontally and nd it is perfect for my small city lot installation.
    [ Hits: 147 | Votes: 0 | Rating: 0 ]
Antennas : Theory
  • Stacking, Phasing and Matching Yagi Antennas - This is a synopsis of a talk presented to the Sydney VHF DX GROUP by VK2ZAB on how, when and why is convenient to build a Yagi antenna stack.
    [ Hits: 239 | Votes: 2 | Rating: 10 ]
Antennas : VHF UHF
  • IAT Interactive Antenna Table - IAT is an excel sheet table evaluate parameters of VHF UHF antennas edited by Vladimir UR5EAZ. The difference between this tool and the existing VE7BQH Antenna Table is the use of G / T and C / N instead of the G / Ta parameter. In this table, Vladimir applies the ITU recommendations to assess the noise properties of a radio receiving system and shows the advantage of the G / T concept over the G / Ta concept when choosing an antenna.
    [ Hits: 104 | Votes: 4 | Rating: 9.5 ]
Antennas : Yagi
  • More UHF Cheap Yagi Antennas - A collection of 450 MHz Cheap Yagis that have proven great portable operations, back-packing and transmitter hunts, and are something inexpensive you can throw up in the attic for that weak repeater
    [ Hits: 202 | Votes: 0 | Rating: 0 ]
Manufacturers : Antennas : HF
  • Pocher Antenne - Amateur radio antennas manufacturer. Produces HF end-fed, dipoles, and other wire antenna types, mono band and multi band antennas.
    [ Hits: 113 | Votes: 1 | Rating: 2 ]
  • EPS Antennas - Amateur radio antenna manufacturer, HF VHF UHF antennas, and amateur radio accessories dealer based in Lingen Germany
    [ Hits: 133 | Votes: 2 | Rating: 8 ]
Manufacturers : Antennas : VHF UHF Microwave
  • ANjo Antennen - Amateur radio antenna manufacturer produces mainly VHF UHF beam antennas based in Germany
    [ Hits: 104 | Votes: 1 | Rating: 1 ]
Radio Equipment : HF YAGI Antennas : Hy-Gain TH3JR
  • Hy-Gain TH3jr Beam Manual online - Hy-Gain TH3jr Tri-band HF 3 Element Beam Covers 10, 15 and 20 Meters assembly instruction manual
    [ Hits: 179 | Votes: 2 | Rating: 5 ]
Technical Reference : Software Defined Radio : RTLSDR
  • RTL SDR with Active Antennas for HF - Experiences with software defined radios SDR and active antennas using the RTL SDR dongle and Spyverter HF up-converter
    [ Hits: 181 | Votes: 2 | Rating: 10 ]

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