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342 links - and 5 categories

Antennas : 30M
  • Shortened 30m Dipole - This article describes the construction of a 9,50 m long dipole for the 30 m band (10.1 MHz to 10.15 MHz). It was designed to be mounted ca. 6 m above ground inside an attic. The calculations were performed by OE1MEW
    [ Hits: 122 | Votes: 1 | Rating: 1 ]
Antennas : 6M
  • 6m Oblong Loop Antenna - Homebrew 6 meters antenna for SOTA and Parks activations.
    [ Hits: 81 | Votes: 0 | Rating: 0 ]
Antennas : Antenna Calculators Antennas : Capacitive
  • Microvert Antenna for 40m by ON7IR - A mircovert antenna assembled for the 40m version of the DL7PE antenna. A one meter long aluminum tube with 24mm diameter is used for the base (element 1) and a 50cm aluminum tube with 20mm diameter for element 2 (the extention). A pvc pipe, 34cm long and with a diameter of 38mm, is used to wind the coil on (1mm enamelled copper wire).
    [ Hits: 149 | Votes: 0 | Rating: 0 ]
Antennas : End-Fed
  • End Fed Antenna for WARC Bands - I used a FT 240-43 for much more power, not needed but beter safe than sorry. 150 Watt continious, 300 Watt PEP SSB, 90 Watt Digimodes 10 Mhz, 18 Mhz, 24 Mhz Very easy to build design and a good antenna for people who don't have much space for big towers or long wires This design is from Hans - PE1RNU
    [ Hits: 184 | Votes: 1 | Rating: 3 ]
  • 8010 Enfed Antenna - With this antenna the coverage is 80,40,20,15 and 10 meter band without any antenna tuner and the average SWR is below 1.2 on phone bands. The total antenna lenght is about 23 meters , with one 20.4 meters long segment from the 1:49 transformer to the 110uh coil and about 2.2 meters long segment from the coil to the insulator.
    [ Hits: 137 | Votes: 0 | Rating: 0 ]
  • Delta Loop vs End Fed Half Wave on 20m - Intrigued by a German OM positive experience with a 20m delta loop, the author replicated the design, noting its favorable 50-ohm impedance compared to their 40m version. Testing against a vertical EFHW, the delta loop excelled within EU but lagged at longer distances. Despite needing more testing, the user leaned towards the EFHW for its overall performance and practicality.
    [ Hits: 123 | Votes: 0 | Rating: 0 ]
Antennas : Homebrewing Techniques
  • Antenna Manufacturing: How to Prevent Galvanic Corrosion - Galvanic corrosion, a destructive process triggered by dissimilar metal contact in a corrosive electrolyte, poses a significant threat in antenna manufacturing. With aluminum and stainless steel components commonly involved, unaddressed corrosion can lead to white particle accumulation, causing long-term damage. Awareness of the galvanic series and the application of protective coatings like Alumslip can mitigate this pervasive issue, ensuring a prolonged antenna lifespan.
    [ Hits: 54 | Votes: 0 | Rating: 0 ]
Ham Radio : Clubs : North America : USA : New York
  • Schoharie County Amateur Radio Association - The Schoharie County Amateur Radio Association (SCARA) was established by a group of Schoharie County amateurs, along with a few from just over the County line in 1946. That date is based on the best we can find from old club records and recall of conversations with some of the original group, now all SK.
    [ Hits: 9 | Votes: 0 | Rating: 0 ]
Operating Aids : History
  • Evolution of Car Radios: From Marconi to Motorola - his historical account traces the development of car radios from Marconi's mobile wireless telegraph station on a steam engine vehicle in 1901 to Motorola's iconic car radio models in the 1930s. It highlights key milestones such as Alfred Grebe's radio-telephone experiments on Long Island and the introduction of Marconi-Phone 8 radios by the Daimler Company in England. The narrative explores technological advancements, including the transition from TRF to Super-Heterodyne circuitry and the integration of push-button controls. The evolution from vacuum tubes to transistors and compact discs is also documented, showcasing the continuous innovation in automotive entertainment systems.
    [ Hits: 47 | Votes: 1 | Rating: 1 ]
Propagation : Beginner's Guide
  • Exploring the Spectrum From HF to UHF Frequencies - During radio's early days, high frequencies were under 30 MHz due to technical limitations. As understanding grew, components improved, allowing for higher frequencies like VHF and UHF up to 3 GHz. The HF band's long wavelengths provide unique propagation challenges influenced by solar activity. VHF and UHF bands face diffraction and reflection issues but offer diverse applications, from amateur radio to 5G and GPS technologies.
    [ Hits: 56 | Votes: 0 | Rating: 0 ]
Propagation : MUF Indicators
  • HamDXMap - This dynamic DX Map aggregates various resources that will help radio amateurs to operate their stations in search of long distance contacts, DX. HamDXMap displays current MUF values and foF2 critical frequency values around the globe.
    [ Hits: 385 | Votes: 9 | Rating: 9.22 ]
Radio Equipment : HF Transceivers : Elecraft KX3
  • KX3 assembly videos - Four part series of assembly videos of the Elecraft KX3. Even if these videos are not a step by step format of the build but rather viewing completed steps with learned information, the author pass along to help your build go smoother
    [ Hits: 32 | Votes: 0 | Rating: 0 ]
Shortwave Radio : Broadcasters
  • LW MW Antennas and More - A large archive of medium-wave and long-wave broadcasting antennas from all over the world
    [ Hits: 74 | Votes: 0 | Rating: 0 ]
Software : Awards tracking
  • Award Secretary - Program for do application and endorsement for all ARRL awards-30 awards-18 for DXCC -12 for others and 8 special querry (how long I'm waiting for QSL. You can merge several awards and endorsement in a one application and upload adif file to ARRL page by ON-LINE method. Offering optimization task for cost checking QSO.Cooperating CLUBLOG
    [ Hits: 86 | Votes: 0 | Rating: 0 ]
Technical Reference : AI Ham Radio
  • Wave talkers: Introduction to AI in Ham Radio - WaveTalkers asked AI itself what it thought. All of the content in the WaveTalkers AI Resources section is generated by AI. From the content to the code itself they will make every effort to showcase what works and what doesn't along the way.
    [ Hits: 35 | Votes: 0 | Rating: 0 ]
Technical Reference : Homebrew
  • PCM Kestrel HF Transceiver - This article describes an upgrade to the Kestrel transceiver, replacing its LCD display with a 0.91-inch OLED screen for improved sound quality. VFO boards from Denys VK3ZYZ were integrated, particularly a Nano VFO board. The author shares details about the setup and the resulting enhancements, along with images of the modified components. The transceiver is now optimized for various frequencies and operates at a power output of approximately 120 W pep. More information about the boards can be found on the provided website.
    [ Hits: 65 | Votes: 0 | Rating: 0 ]
Technical Reference : LoRa and LoRaWan
  • A Comparative Study of APRS Tracks with 1W and 100mW LoRa Trackers - Exploring LoRaWAN Range, comparing the performance of 1Watt and 100mW LoRa trackers on daily commute. Analyzing APRS tracks, beacon statistics, and visual comparisons to uncover insights and surprises in the world of long-range wireless communication.
    [ Hits: 42 | Votes: 0 | Rating: 0 ]
  • LoRa in Amateur Radio - About LoRa, wireless communication technology designed to transmit data over long distances. LoRa provides a means for wireless data transmission over long distances with low power consumption. Practical applications of LoRa in amateur radio
    [ Hits: 98 | Votes: 0 | Rating: 0 ]
Technical Reference : Radio Frequency Interference
  • The battle with massive RFI problems in the shack - This fall/winter 2 events has happened at about the same exact time. I finally got around to putting up an end fed long wire for 80M (and maybe 160M) The fridge big the bullet and we ended up purchasing a new fridge.
    [ Hits: 95 | Votes: 0 | Rating: 0 ]

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