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125 links - and 3 categories

Antennas : 2M
  • 2m Quad Turnstile Antenna - The loops are made of 10 mm round aluminum tube. No bending pliers was used to gently bend 90 degrees to obtain a square with 53 cm inner sides. Each loop has an impedance of approximately 100 Ohm. To connect both radiators in phase, a quarter wave long feeder of 100 Ohm is required.
    [ Hits: 207 | Votes: 0 | Rating: 0 ]
  • 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 : 6M : 6 meter Yagi Antennas
  • 6 Elements Yagi Antenna on 50 MHz - This is a design based on the QuickYagi 4 software by WA7RAI with some changes for practical reasons. The beam uses 6.5 metres of standard 25mm square boom, 12mm diameter elements without tapers. The actual boom length used is 6.3 metres and all parts are readily available.
    [ Hits: 131 | Votes: 2 | Rating: 6 ]
  • 6el LFA Yagi for 50MHz - This six element LFA Yagi for six meters has a 1.5 inch square boom with a 1.5 inch secondary boom beneath the first. This ensures the 7.3 metre long boom will not sag and will not require any guying. This antenna has 12.3 dBi Gain and just over 23dB F/B.
    [ Hits: 117 | Votes: 2 | Rating: 4 ]
Antennas : Antenna Calculators
  • 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 ]
Antennas : Halo
  • Halo Antenna for 50 MHz - The antenna described in this article is for 50 MHz, but the design can be scaled for any band, including VHF, UHF, or even the higher HF bands. The antenna is nothing more than a square loop of wire, approximately 30" (or ~76cm) per side. The loop is fed in the middle of one side, and the opposite side to the feed point has a gap in it.
    [ Hits: 292 | Votes: 0 | Rating: 0 ]
  • Square Halo Antenna for 10 and 20 Meters - How to build a limited space 10 and 20 meter band Square Halo DX antenna. A horizontally polarized antenna for 10 and 20 meter band, which is suitable for a limited space.
    [ Hits: 239 | Votes: 1 | Rating: 9 ]
Antennas : Receiving
  • 160 Meters 4 Square Receive Antenna - A four square array receiving antena for the top band, performance is extremely directional and space requirements are really hard to fulfill.
    [ Hits: 179 | Votes: 1 | Rating: 10 ]
Antennas : VHF UHF
  • Double Quad Antenna for VHF UHF - The structure of this dual band VHF UHF antenna is very simple. It consists of two identical square loops, whose sides measure a quarter wave, connected together at the ends. A project by I5NZR
    [ Hits: 247 | Votes: 6 | Rating: 6.33 ]
Manufacturers : Antennas : HF : Vertical Antennas
  • DX Commander Antennas - DX Commander produces economical multi-band antennas available in kit form. 4 Square array vertical antennas, vertical multiband antennas, sota and travel antennas
    [ Hits: 273 | Votes: 0 | Rating: 0 ]
Operating Aids : Grid Squares
  • Interactive Ham Radio Locator Map - This grid locator map uses Google map apis to find your QTH locator by simply clicking on the map. You can either enter your QTH locator and find the calculated distance and bearing between your QTH and another grid square.
    [ Hits: 1397 | Votes: 7 | Rating: 7.28 ]
  • Interactive Maidenhead Grid Square Locator Map - Amateur Radio Ham Radio Maidenhead Grid Square Locator Map online. This map allow just a point and click to determine dynamically the correct six characters locator. Other functions allow to calculate the distances among two given locators, or coordinates. Hover over map, specify grid, or enter latitude and longitude to show grid and/or calculate distance. Map is powered by Bing Maps.
    [ Hits: 2623 | Votes: 7 | Rating: 8 ]
  • Maidenhead square Calculator - You can use this tool to calculate the maidenhead square by entering the longitude and latitude.
    [ Hits: 146 | Votes: 1 | Rating: 8 ]
  • Interactive Grid Square Map - An online interactive grid square map made with openstreet map. Just point and click and zoom in to determine an accurate grid square locator till 10 digit resolution
    [ Hits: 558 | Votes: 6 | Rating: 6.67 ]
Operating Aids : Maps
  • World Grid Square Map PDF  updated - This free PDF file contains two Worldwide grid square maps. The first map displays the fields (first two letters of a maidenhead locator) while the second includes also squares (third and fourth digit) and it can be useful to determine what is your ham radio grid square. PDF file can be enlarged and scaled to A3 and higher dimensions.
    [ Hits: 3269 | Votes: 14 | Rating: 7.15 ]
  • WW Locator with Google Maps - WW Locator grid square map and QTH locator made with google maps for ham radio
    [ Hits: 302 | Votes: 4 | Rating: 5.75 ]
Software : Databases
  • Repeater-START App - The amateur radio listener for when you're not on the radio. Repeater-START, the offline repeater listing app for Windows, Linux, Raspberry Pi, Ubuntu, Librem Phone is available, Now with grid square display, topographical maps and frequency preferences
    [ Hits: 150 | Votes: 0 | Rating: 0 ]
Software : Grid Bearing and Maps
  • Google Earth Grid Square Locator - This page host a simple Windows program that will create an overlay for Google Earth that displays the Maidenhead grid. If you only need 4-character locator coverage, you can download an alternative ready-to-use kmz-file.
    [ Hits: 825 | Votes: 6 | Rating: 4.17 ]
  • Grid Calculator - Grid Calculator allows you to calculate either a grid square locator or the latitude and longitude of a location. Grid Calculator can be used to calculate a Great Circle bearing and distance between two stations in statute miles, nautical miles, and kilometers.
    [ Hits: 311 | Votes: 0 | Rating: 0 ]
Technical Reference : Headsets and Speakers

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