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• TriBand Moxon Antenna for 6m 4m 2m - A PDF presentation of a home made moxon antenna for 50 MHz 70 MHz and 144 Mhz. The project is mainly out of surplus plastic Plumbing pipes and clips etc, and also details of how the dimensions were calculated.
  [ Hits: 1367 | Votes: 7 | Rating: 7.11 ]

• Quad Antenna On-line Calculator - Cubical Quad Antenna On-line Calculator helps on defining the size of each element and spreader. Simply give the resonating frequency and it will calculate size of each element.
  [ Hits: 294 | Votes: 1 | Rating: 5 ]

• J-pole antenna Calculator - Online calculator for J-Pole antennas. The J-pole antenna consists of a short and a long vertical pole with a feed point near the bottom. The antenna looks like the letter J, hence the name J-pole antenna.
  [ Hits: 417 | Votes: 0 | Rating: 0 ]

• Notes on Designing LF-MF antennas - A free book on designign LF MF antennas. The six chapters in the body of the book are limited to basic information which, combined with a little modeling or simple calculations, can be applied directly using graphs for special problems like inductor design.
  [ Hits: 267 | Votes: 2 | Rating: 9.5 ]

• 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: 1412 | Votes: 7 | Rating: 7.28 ]
• Interactive Maidenhead Grid Square Locator Map  ^updated - 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: 2680 | Votes: 8 | Rating: 7.12 ]

• Seiuchy On-line morse code trainer - Seiuchy is a web based morse code trainer that can be used even offline once the page is loaded. Trainer can be configured to send call signs only or just part of a standard QSO, and a full QSO too. Answers are then compared and displayed and a score get calculated.
  [ Hits: 245 | Votes: 2 | Rating: 9.5 ]
• Recognition of CW signs at different listening levels and frequencies - The recognition of telegraphy masked by noise at 40 and 80 signs/min telegraphy speed was studied in 10 normal-hearing subjects at different sound pressure levels (25-85 dB SPL in steps of 5 dB) as well as at different test frequencies (2000, 1000, 800, 630, 500 and 250 Hz). The ability to recognize the signs varied with varying SPL. Recognition for most of the subjects was best at an SPL close to 70 dB. All subjects improved their recognition as the frequency was lowered to 500 Hz, some even at 250 Hz. These facts should be taken into consideration when training telegraphy operators as well as in the construction of radio receivers to permit listening at low frequencies. Furthermore, the critical ratio was calculated at the different test frequencies.
  [ Hits: 81 | Votes: 1 | Rating: 7 ]

• Balun_cmr Calculate common-mode impedance - This EXCEL Program Worksheet calculates the common-mode impedance of a 1:1 Guanella (current) balun which is placed at the feed point of a balanced antenna system fed via coax.
  [ Hits: 404 | Votes: 1 | Rating: 10 ]
• Antenna Calculation Software - The program consists of tabbed pages for various antenna and transmission line calculation. You can compute the values for an inverted L network that will allow you to match the 50 ohm output of the radio, or you can compute the necessary length in the units of choice for a 5/8 wave vertical for 10 meter band.
  [ Hits: 435 | Votes: 1 | Rating: 10 ]
• Small Loop Antenna Calculator by KY8D - A free Labview antenna calculator program. This interesting calculator for small loop antennas can be ran on most recent Windows versions using the Labview runtime.
  [ Hits: 340 | Votes: 4 | Rating: 6.5 ]

• FT CALC 1.3 - Ferrite Toroidal Core HF Calculator - This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between 1 and 50 MHz. Manufacturer data for complex permeability, magnetic dimensions, and saturation flux density must be available. Some core types which are commonly used in amateur transmission are included. The program produces limiting winding voltages for linear operation and temperature rise over the range of frequencies and power specified.
  [ Hits: 283 | Votes: 1 | Rating: 2 ]
• Online Helical Coil Calculator - This online calculator will give as output the Inductance L of a coil, including the total lenght of the wire needed to wound the coil. As input, requires the Diameter, number of turns, wire diameter and turn spacing
  [ Hits: 342 | Votes: 7 | Rating: 5.71 ]
• Online Coil Inductance Calculator - This online calculator will return the inductance of a coil. It will ask you the total number of turns, the total diameter of the coil and its lenght, from the first winding to the last. Obtaining the correct inductance in winding a coil can be easy if you already know how many turns are needed. Available in inched and centimeters,
  [ Hits: 104 | Votes: 0 | Rating: 0 ]
• One-turn loop inductance Online Calculator - The high-frequency inductance of single-turn loops of various shapes made of round wire can be estimated accurately with a simplified formula
  [ Hits: 122 | Votes: 1 | Rating: 10 ]
• Amidon ferrite toroids calculator - Select the toroid by material type and dimension of the toroid, the desired inductance and you will get the numbers of turns
  [ Hits: 394 | Votes: 3 | Rating: 6 ]

• 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 ]
• GridLocW Locator converter - GridLocW is a free Lat/Long to Maidenhead converter for Windows - with optional GPS support, includes the formula to calculate geodesic distance (in m) between two points specified by latitude/longitude.
  [ Hits: 212 | Votes: 0 | Rating: 0 ]

• Free ham radio utilities written in LabVIEW - Free ham radio utilities written in LabVIEW includes Open Wire Calculator, Dipole Peak/Null Angle Calculator, a Coil-Shortened Antenna Calculator ad interesting Round Coil Inductance Calculator and a Skyloop Antenna Calculator
  [ Hits: 294 | Votes: 2 | Rating: 5.5 ]

• A Tutorial on the Decibel - This tutorial provides background information on the decibel and instructions for performing calculations involving decibels. This tutorial combines information from several authors, including Bob DeVarney, W1ICW; Walter Bahnzaf, WB1ANE; and Ward Silver, NOAX
  [ Hits: 351 | Votes: 1 | Rating: 7 ]

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