half h

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half h

194 links - and 1 categories

Antennas : 160M
  • The 160M No Excuses Homebrew Vertical - This antenna is designed for stations having a difficult time putting a decent signal on 160M from small or CC&R d lots. It is a 24.5 ft. vertical antenna, made from three 10 ft. PVC sections bolted together, and half wavelength of antenna wire helically wound around the PVC sections.
    [ Hits: 404 | Votes: 0 | Rating: 0 ]
  • 160m Kite Vertical Antenna - An essential kite antenna plan for the top band, Antenna has been tested at half wave and quarter wave.
    [ Hits: 261 | Votes: 1 | Rating: 10 ]
Antennas : 30M
  • A 30 Meter Sloping Dipole Antenna - This variation of the basic horizontal, half wavelength flat top dipole has proven to be a simple, effective antenna suitable for both home and portable use.
    [ Hits: 452 | Votes: 0 | Rating: 0 ]
Antennas : 40M : 40 meter Vertical Antennas
  • A very efficient half size 40 meter Vertical Antenna - A vertical antenna project for the 7MHz made with some spare parts. Based on a broken 20 foot fishing pole, it is based on a good ground system made with radials and a capacitive hat done to increase the global radiation resistance of the antenna. A custom loading coil is also included in this project to perfectly tune the antenna to the CW portion of the 40 meters band.
    [ Hits: 735 | Votes: 4 | Rating: 8.5 ]
Antennas : 60M
  • 60 Meter EF-HW antenna - 60 Meter End Fed Half Wave Antenna Tuner with large pictures of the 5 MHZ antenna tuner
    [ Hits: 563 | Votes: 5 | Rating: 9.4 ]
Antennas : Dipole
  • The Short Dipole - There are several ways to reduce the length of a dipole and still use it as an effective antenna. Remember it is the electrical length that determines resonance. The physical length can be considerably less than a half wave length on your desired frequency as determined by 468/f MHz.
    [ Hits: 202 | Votes: 0 | Rating: 0 ]
  • The half-wave dipole, your first antenna - Construction tips of a basic wire antenna, the half wave dipole. Inverted V dipoles and effects of inverted v on radiation pattern.
    [ Hits: 234 | Votes: 1 | Rating: 9 ]
Antennas : End-Fed
  • Multi-band End-Fed Antenna - An excellent guide to homebrewing multi band end-fed antennas. The article, embed several drawings including diagrams and detailed pictures, illustrating the basic funcionality of end-fed antennas. The author gives some basic hints on how to build a half size antenna for 80 40 to 10 meters and a 6 meter to 40 meter configuration. It is also well described how to build the impedance transformer and the loading coils for lower bands.
    [ Hits: 1100 | Votes: 6 | Rating: 4.5 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • 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 ]
  • End Fed Half Wave Antenna Coupler - A home made end-fed half-wave antenna coupler with antenna lenght calculator and counterpoise calculator based on center frequency. Includes pictures and drawings along to antenna homebrewing instructions with a home made on air wound transformer
    [ Hits: 282 | Votes: 0 | Rating: 0 ]
  • EFHW autotransformer comparison - Two different ways to create autotransformer for end fed half wave wire antennas, by using ferrite or air core.
    [ Hits: 521 | Votes: 3 | Rating: 2 ]
  • The End-Fed Half-Wave Antenna - Presentation - A very well done presentation about End-Fed Half-Wave antennas. This PDF document contains a summary of experiences in how to build custom EFHW antennas. Includes an interesting comparison table of UnUn configurations with recommended toroids, Wire size, turns and capacitors. An useful recap on common errors in building homebrew EFHW Ununs completes the document.
    [ Hits: 406 | Votes: 3 | Rating: 8.67 ]
  • 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: 287 | Votes: 2 | Rating: 10 ]
Antennas : Fan Dipole
  • 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 ]
Antennas : J-Pole
  • Construction of a J-Pole antenna for 2 meter - If you like building good antennas, this one is for you. The J-pole is a slim, omnidirectional, half-wave antenna fed at the end through a quarter-wave shorted transmission line. Its predecessor is the famous Zepp antenna developed for the Zeppelin airship.
    [ Hits: 381 | Votes: 2 | Rating: 10 ]
Antennas : Sloper
  • Half Sloper Multiband Antenna - A presentation of a HF multi-band sloper antenna. This antenna project is for low band operations, and antenna presented in this article works on 40 80 and 160 meters band. Article is in Polish.
    [ Hits: 787 | Votes: 5 | Rating: 7 ]
Antennas : Wire
  • HF Wire Antennas for Field Day - Dipole antennas, vertical half-wave dipole antennas with impedence tranformes that can be used for portable operations. Some well worn antenna configurations are the easiest and loudest lash-ups you can try.
    [ Hits: 219 | Votes: 0 | Rating: 0 ]
Manufacturers : Software Defined Radio
  • ADALM-PLUTO SDR - The Adalm Pluto by Analog Devices is a Portable self-contained RF learning module, based on Analog Devices AD9363--Highly Integrated RF Agile Transceiver and Xilinx® Zynq Z-7010 FPGA. Includes one transmitter and one receiver, half or full duplex and cover 325 MHz to 3.8 GHz
    [ Hits: 163 | Votes: 2 | Rating: 10 ]
Technical Reference : 3D Printed Projects
  • 3D Printed Accessories for the FT-817 and KX2 - DC plug adaptor using an XT60 connector. 18650 Lithium battery 3 cell carrier, Three band end fed half wave antenna, XT60 chassis mounted flange.
    [ Hits: 182 | Votes: 0 | Rating: 0 ]
Technical Reference : Power Meter
  • A simple QRP Power Meter Project - A really simple project to make a power meter measuring RF output powers from a few mW up to half a watt. A DIY amateur radio project for QRP enthusiasts
    [ Hits: 461 | Votes: 0 | Rating: 0 ]

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