hi gain

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hi gain

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Antennas : 12M
  • Trapped Dipole for 12 and 17 Meters - A small sized and very cheap antenna project that allow you to work on WARC bands with a total gain very close to the dipole in both bands. On 12 meters is a normal dipole, while on 17 is a trapped dipole. Article in Italia
    [ Hits: 882 | Votes: 1 | Rating: 1 ]
Antennas : 2M
  • A Portable Quad for 2 Meters - Backpacking, boating or mountaintopping ? Invest your time and pack this novel directional gain antenna on your next expedition
    [ Hits: 1576 | Votes: 7 | Rating: 6.86 ]
Antennas : 40M : 40 meter Delta Loop Antennas
  • 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 ]
Antennas : 6M : 6 meter Yagi Antennas
  • 3 Element 12,5 Ohm Yagi for 50 MHz - Article about a high-gain, narrow-band version feature 7.15 dBd and a F/B 13dB with details on how to setup in array mode
    [ Hits: 467 | Votes: 2 | Rating: 6.5 ]
Antennas : 70cm
  • EF7018 - UHF 18 Elements Yagi Antenna Plan - A 70 cm yagi antenna design by YU7EF includes tables with antenna elements dimension and spacing. This UHF Yagi antenna plan provides a maximum gain of 17.93 db
    [ Hits: 321 | Votes: 0 | Rating: 0 ]
Antennas : HB9CV
  • How to make a HB9CV - The HB9CV is a well known two element antenna of a directional beam type with a forward gain of 4 to 5 dBd. This one is for two metres but it can be scaled, from the dimensions in the diagram, for other bands I have also made them for four and six metres
    [ Hits: 1467 | Votes: 9 | Rating: 4.45 ]
Antennas : Helical
  • Mixed Mode Helical Antenna - An experimental omni-directional antenna for 70cm which has both horizontal and vertical gain
    [ Hits: 1004 | Votes: 3 | Rating: 8 ]
Antennas : Loop
  • Horizontal Loop Antenna Experiments - The HF horizontal loop has been around for many years now. This article includes a YouTube video and discusses the reasons for looking at this antenna, its design, and its installation. There are some on-air comparisons against three regular double bazooka (coax) dipoles and the Par SWL End-Fed antenna.
    [ Hits: 926 | Votes: 5 | Rating: 8 ]
Antennas : Magnetic Loop
  • Magnetic Loop antenna for VHF - A magnetic loop antenna for the VHF band, featuring a high gain that can be compared to a quarter wave vertical antenna
    [ Hits: 731 | Votes: 9 | Rating: 5.99 ]
Antennas : Morgain
  • Morgain 40-80 by IM0JZJ - This folded dipole, can be even built for 10 and 20 meters band, and can also give good results on 15 meters, with the sole lenght of just 20 meter of total lenght. Originally born to work on 40 meters, can be adapted for any band.
    [ Hits: 1711 | Votes: 7 | Rating: 6.71 ]
  • Morgain Antenna, the old lady - An introduction to history of Morgain Antenna, since the early origins in Virginia, to the current home made projects and design available on the net. Article in Italian
    [ Hits: 1462 | Votes: 6 | Rating: 7.33 ]
Antennas : Theory
  • The Yagi Antenna - Presentation - A presentation of the Yagi Antennas, and other interesting tid-bits by Brian Mileshosky. This document explains basic concepts of Yagi-Uda antenna theory, influence of reflector and directors on global antenna gain and directivity of radio waves. A simple tape measure antenna project is also included.
    [ Hits: 535 | Votes: 2 | Rating: 7 ]
Antennas : Theory : Antenna Gain
  • Antenna Gain - We all think we know about it, we all think we need it, but what is it really?
    [ Hits: 459 | Votes: 0 | Rating: 0 ]
Antennas : VHF UHF
  • VHF-UHF Long Boom Very High Performance Antenna Designs - Experimental Long Boom Antennas - CP, LPDA, multiband with several NEC Files for 50MHz 144MHz 222 MHz 432MHz but also 902MHz and 1296 MHz Antenna projects. Includes also for each antenna model, in a general comparison table each antenna characteristics including Directive Gain, G/T, E-F/R, H-F/R abd Boom Length. This is a great value comparison table of several commercial and home made VHF UHF antenna projects.
    [ Hits: 188 | Votes: 1 | Rating: 10 ]
Antennas : Yagi
  • How to stack dissimilar yagi antennas - In this article the author provides some guidelines on how to solve a common problem when stacking different types of yagi antennas on the same mast, limiting the effects on gain and radiation pattern of both antennas
    [ Hits: 713 | Votes: 2 | Rating: 5.5 ]
DX Resources : DX Peditions : 2020 DXpeditions
  • A35JP Tonga - I will QRV again from Tongatapu Island (OC-049) as A35JP from 24th November 2019 to November 2020. This time, I will be stationed there as a resident supervisor of the international coorporation project. From 24th November 2019 to November 2020 160m-6m. CW, SSB, FT8
    [ Hits: 279 | Votes: 0 | Rating: 0 ]
Operating Modes : Ham Radio Balloons
  • High Altitude Ballooning, From The Ground Up (and back again) - High Altitude Ballooning makes for a challenging project that sometimes turns into an engrossing hobby. Whilst it is not rocket science it does encompass a wide range of fields (sometimes literally) and there is a lot to learn before you send your first flight up into the sky.
    [ Hits: 136 | Votes: 1 | Rating: 10 ]
Radio Equipment : HF Transceivers : ICOM IC-756
  • ICOM 756 and 756PRO - Ini this article the author compare the Icom 756 and Icom IC 756 PRO. Comparison is very detailed and includes S Meter Calibration, Microphone Gain, Transverter Jack, the noise blanked, the spectrum analyzer, audio quality, notch filter, compression meter, noise reduction, sensivity and filter settings along to many other features making this article a must for who want to compare this two models
    [ Hits: 230 | Votes: 1 | Rating: 8 ]
Technical Reference : Preamplifiers
  • 435 plus 1296MHz ATF54143 Pre-amplifier - The prototype for this amplifier was originally designed for 70cm and was used on the 2004 3B9C Dx-pedition to Rodriguez Island for satellite and EME. It had a noise figure of 0.49dB with an associated gain of 20dB.
    [ Hits: 333 | Votes: 0 | Rating: 0 ]
Technical Reference : Test Equipment
  • Antuino - Antenna Test Equipment - Antuino is an accurate instrument that can be used in the field to measure SWR, field strength, modulation, etc. In the lab, it can be used to sweep filters, measure gain, distortion, frequency response, etc. It works upto 150 Mhz. On the third harmonic, it is usable on 435 Mhz band as well (with reduced sensitivity).
    [ Hits: 304 | Votes: 0 | Rating: 0 ]

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