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• The Story of the Broadband Dipole - A dipole can be broadbanded by a number of techniques including by matching with resonant sections of transmission feed lines.
  [ Hits: 410 | Votes: 0 | Rating: 0 ]

• Optimizing Ground Radials in End-Fed Antennas - An interesting article focused on defining the optimal lenght and number of ground radials in vertical, inverted-L, end-fed antennas. This article compares also the radial length vs number of ground radials to power loss in transmitted power.
  [ Hits: 433 | Votes: 1 | Rating: 10 ]

• Building a VHF Contest Station - Building an amateur station for competitive radiosport involves a number of critical steps, regardless of the band or bands you focus on. These include, but are certainly not limited to: Station layout, Equipment interconnection and switching, Inter-station interference, Antenna selection. Radio interface with the logging program, CW and voice keyer integration, Rotator control
  [ Hits: 336 | Votes: 1 | Rating: 4 ]

• History of The Amateur radio LOCATOR System - This article taken from the IARU Region 1 VHF handbook, is about the history of the original Locator System named QRA-Locator consisted of just five-character code, two capital letters, a two-digit number and a lower-case letter, like inf example CM72j
  [ Hits: 192 | Votes: 1 | Rating: 1 ]

• 1200z Time Explained - Military time notation is based on 24-hour clock. A time of day is written in the form hhmm, where hh (0-23) stands for full hours that have passed since midnight, mm (00-59) is the number of minutes that have passed since the last full hour. To convert hours greater then 12 to 12-hour clock just subtract 12 from the given hours and that will give you the PM time
  [ Hits: 135 | Votes: 1 | Rating: 4 ]

• Morse code practice - A comprehensive morse code auduio guide with several youtube movies classified by skill level, characters and numbers, sentences, speed level and more. All movies are linked by an interactive interface that let you select the speed and the excercise type. The page contains an downloadable set of morse code exercises and several other resources
  [ Hits: 134 | Votes: 0 | Rating: 0 ]

• WWV numbers and F2 Propagation - Comments on the irrelevance of WWV numbers to 50 MHz F2 propagation
  [ Hits: 159 | Votes: 1 | Rating: 8 ]

• Solar Cycle Progression - A dynamic graph of current and past solar cycle sunspot number progression and F10.7 cm radio flux progression. In both plots, the black line represents the monthly averaged data and the purple line represents a 13-month weighted, smoothed version of the monthly averaged data.
  [ Hits: 235 | Votes: 0 | Rating: 0 ]

• How propagation works on VHF Bands - Thunderstorm effects on sporadic E propagation, Very long distance propagation in the 144 MHz band, Analysing the number of skips in multiple hop propagation
  [ Hits: 113 | Votes: 2 | Rating: 10 ]

• Sunspot Index Since 1750 - The yearly, black, up to 1750, and monthly red, from 1750 up to now, sunspot numbers provided by the Royal Observatory of Belgium SILSO
  [ Hits: 115 | Votes: 0 | Rating: 0 ]

• Challenger DX Antenna Review by NK7Z - A review of the GAP Challenger DX Antenna that is not a traditional 1/4 wave vertical, but is a vertical dipole, this gives it several advantages over a standard 1/4 wave vertical, mainly the reduced number of radials, with excellent performances.
  [ Hits: 221 | Votes: 2 | Rating: 10 ]

• Decoding Numbers Stations - QST Article - Exploring these mysterious transmissions and how their strong following has created a niche in the community. Free article in PDF Format from QST November 2019
  [ Hits: 519 | Votes: 0 | Rating: 0 ]

• mini Ring-Core-Calculator - Calculate windings on ferrite cores - The program can be used to calculate inductors (coils) and their number of turns on ferrite cores, ferrite shells and air coils. These can be used for baluns, Ununs, bandpass filters, low pass filters, resonant circuits, and more. The technical specifications of the cores are already integrated in the program. Application is free and runs on Windows 32 bit versions only. To make it run on Windows 10 64 bit need to be unzipped in a single folder.
  [ Hits: 398 | Votes: 1 | Rating: 1 ]
• 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 ]
• 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: 393 | Votes: 3 | Rating: 6 ]

• AGWMorseTrainer  ^updated - A windows program to learn Morse code and doing QSO in CW. The training course contains 39 Lessons based on Koch method. It can sends only letters, only numbers, only punctuation
  [ Hits: 214 | Votes: 1 | Rating: 1 ]

• com0com Null-modem emulator - The Null-modem emulator is an open source kernel-mode virtual serial port driver for Windows, available freely under GPL license.Allows you to create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another.
  [ Hits: 635 | Votes: 1 | Rating: 5 ]

• 432 MHz 100W RF Power Amplifier - This article describes the construction of a 100-Watt, 70 cm amateur band linear power amplifier. It is the result of a protracted period of experimentation during which I investigated a number of final amplifier stages from obsolete UHF FM 2-way radios.
  [ Hits: 239 | Votes: 1 | Rating: 9 ]

• Frequency counter project - This project includes quite a number of useful testing features which were very useful when building other projects. Almost all the components used to construct this frequency counter were scrounged from old circuit boards and junk equipment.
  [ Hits: 128 | Votes: 0 | Rating: 0 ]

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