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Antennas : 40M 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 : Feed Lines : Choke
  • Common-mode chokes - Chart that present results of impedance measurements made on a variety of common-mode choke implementations across the frequency range 1MHz to 30MHz by G3TXQ
    [ Hits: 605 | Votes: 2 | Rating: 4 ]
  • RF Chokes - A chart presenting the results of impedance measurements made on a variety of common-mode choke implementations across the frequency range 1MHz to 30MHz by G3TXQ
    [ Hits: 905 | Votes: 2 | Rating: 7.5 ]
Antennas : Indoor
  • Ferrite Rod TX Antenna for 40m - No exotic claims are made for this antenna. Author just tried a few WSPR experiments on 40 meters and was surprised with the results. What appears below may inspire you to try something equally off-the-wall, to see what happens.
    [ Hits: 298 | Votes: 1 | Rating: 1 ]
Antennas : Moxon
  • 70cm Moxon Beam - A moxon antenna project for 70 cm band, test and results of this popular antenna model applies to UHF bands.
    [ Hits: 1731 | Votes: 9 | Rating: 6.34 ]
Antennas : Theory : Impedance matching
  • An Examination of the Gamma Match - A Working analysis of the gamma match problem that gives useful practical results in a article dated April 1969.
    [ Hits: 1655 | Votes: 0 | Rating: 0 ]
Antennas : Vertical
  • Balloon Vertical Omni-Antennas - Experimenting vertical wire antennas for 40 and 20 meters supported by balloons resulting in excellent gain in RX and good overall performance against horizontal dipole
    [ Hits: 771 | Votes: 1 | Rating: 5 ]
  • Field Day Vertical Antenna by KN5L - This Field Day Vertical Antenna project is the result of many years of attending various field day sites and realizing that what was needed is a simple, easy to assemble vertical antenna. The design of this Field Day Antenna is not very novel and leverages ideas from Butternut verticals and ARRL publications. The one essential requirement was that the antenna can be raised by just one person. The design of this Field Day Antenna is an above ground mounted ground plane vertical.
    [ Hits: 213 | Votes: 3 | Rating: 7 ]
Antennas : Wire
  • Gieskieng Antenna - This antenna is a result of experimental work of D. H. Gieskieng, W0FK, a narrow monoband antenna, that needs only two support poles and require limited space, needs only 61 ft. for 160 meters band.
    [ Hits: 685 | Votes: 0 | Rating: 0 ]
DX Resources : Contest : Contest Stations
  • PY0F Noronha Contest Group - The Noronha Contest Group is a DX and Contesting group formed by experiencied operators from Brazil with the aim to have fun and participate on the main Amateur Radio Contests & Activities. QSL info, log online and contest results
    [ Hits: 130 | Votes: 0 | Rating: 0 ]
Operating Modes : EME
  • EME user guide by IK1UWL - A complete guide to start operating EME. In this document, that is the result of several years of experimenting, the author summarize the steps to begin on Earth-Moon-Earth communications
    [ Hits: 332 | Votes: 1 | Rating: 7 ]
Radio Equipment : HF Amplifiers : Ameritron ALS-600
  • Ameritron ALS-600S review - ALS-600S review, an abbreviated version of this review first appeared in the March 2005 issue of QST. See QST for lab test results.
    [ Hits: 589 | Votes: 0 | Rating: 0 ]
Radio Equipment : HF Transceivers : Kenwood TS-890S
  • Kenwood TS-890S Sherwood HF Test Results - Receiver performance review of the Kenwood TS-890S HF,50MHz,70MHz amateur radio transceiver by Sherwood Engineering
    [ Hits: 514 | Votes: 3 | Rating: 6.67 ]
Radio Equipment : Receivers
  • Everything you needed to know about Radio Receivers and Scanners - Tuning into the airwaves for new and interesting transmissions has fascinated enthusiasts since the very earliest days of radio. As a result of advances in computer and radio technology, the equipment packed radio rooms of the past are now replaced by scanning receivers sometimes just the size of a mobile phone. What can radio receivers/scanners pick up? What types of radio receivers/scanners are there? What can and cannot be monitored legally? Best practice when using a radio receiver/scanner
    [ Hits: 178 | Votes: 0 | Rating: 0 ]
Shopping and Services : Ham Radio Insurance
  • EURAO Radio Amateur Insurance - The purpose of this insurance is to guarantee the pecuniary consequences of the civil liability incumbent on the insured due to consequential bodily, material and immaterial damage caused to third parties as a result of their radio amateur activities
    [ Hits: 133 | Votes: 0 | Rating: 0 ]
Software : Android
  • Terminator for Android - Android app by VE3VN that show view of night, day and terminator around the globe. This gives a strong hint of which bands and compass directions to focus on for best results.
    [ Hits: 752 | Votes: 1 | Rating: 10 ]
Software : Morse Code Training
  • Morse Code Trainer Online - An online morse code trainer application that allows to select the digits and play them at the wpm speed you desire. While decoding will evaluate the results and will indicate your proficiency level
    [ Hits: 233 | Votes: 0 | Rating: 0 ]
Technical Reference : Amplifiers : UHF Amplifiers
  • 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: 232 | Votes: 1 | Rating: 9 ]
Technical Reference : Homebrew
  • Ham Radio Beat Frequency Oscillator - A simple free running oscillator oscillating at the receiver\'s IF (intermediate frequency) beats with the incoming signals in either CW or SSB and the resultant audio frequency goes to the AF amplifier.
    [ Hits: 717 | Votes: 0 | Rating: 0 ]

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