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Antennas : 20M : 20 meter Vertical Antennas
  • The Vertical Buddi Beam for 20m - The Vertical Buddi Beam on 20m using no Coils. n this article I am going to describe a totally new way to construct and use a very old design the two element Yagi antenna. Unlike the traditional Yagi this design does not require a Tower or a boom, it is 100 percent portable and most important high- performance and easy to assemble using standard Buddipole components.
    [ Hits: 569 | Votes: 2 | Rating: 4.5 ]
Antennas : Magnetic Loop
  • K8NDS Magnetic Loops - Fractional Wave Loops antennas are a sort of magnetic loop antennas that differs in several aspects from the standard ones. Author is now SK however in his page he posted several examples and interesting links
    [ Hits: 161 | Votes: 0 | Rating: 0 ]
Antennas : Theory : Antenna Gain
  • Understanding Antenna Gain in a Few Minutes - A collection of videos on antenna gain and explanations of how some antenna designs may perform better than others based on how their radiation pattern is drawn. Understanding how one antenna can gain more in reception and transmission than another can be complicated, but with these videos the author has without any doubt made it easier.
    [ Hits: 84 | Votes: 0 | Rating: 0 ]
Antennas : Wire
  • Field Day Inverted L - Inverted L antenna, even if not completely freestanding, it only requires one line to be lauched into a tree to support the end of the horizontal wire. This project is done with a 31-foot Jackite pole for a support and uses six 15-foot radials and one 33-foot radial.
    [ Hits: 87 | Votes: 0 | Rating: 0 ]
  • Random Wire Antenna Lengths - When on the trail, at Field Day, or whenever a good antenna is unavailable, a random wire can save the day, but it is important to understand its properties.
    [ Hits: 186 | Votes: 1 | Rating: 2 ]
Ham Radio : Licensing
  • Countries with CEPT Licence - A document that includes a list of all countries implementing CEPT licence, with detailed information on licence types like standard CEPT, CEPT Novice and HAREC. A full list of frequencies, and call signs schemas to be used by foreign operators, compiled by Hans Schwarz, DK5JI
    [ Hits: 176 | Votes: 3 | Rating: 9 ]
Operating Aids : Time
  • Frequency Accuracy and Stability of WWV and WWVH - Measuring the Frequency Accuracy and Stability of WWV and WWVH by Michael A. Lombardi. An examination of just how accurate these frequency standard stations are.
    [ Hits: 81 | Votes: 0 | Rating: 0 ]
Operating Modes : Satellites : CubeSats
  • CubeSat.org - This website provides information and resources for CubeSat developers, including a directory of CubeSat projects and a forum for discussing CubeSat-related topics. The CubeSat standard facilitates frequent and affordable access to space with launch opportunities available on most launch vehicles.
    [ Hits: 12 | Votes: 0 | Rating: 0 ]
Propagation : Resources
  • What to Expect at Solar Minimum - Article on operating aids and band usage during solar minimun periods. Author tries to explain what can we expect on the HF bands during a solar minimum period and which approach to be used to understand band openings.
    [ Hits: 223 | Votes: 1 | Rating: 1 ]
Radio Equipment : Antenna Analyzers
  • miniVNA PRO Installation Notes - Notes on installing the miniVNA PRO software, making a calibration standard, a trap tuning loop.
    [ Hits: 168 | Votes: 0 | Rating: 0 ]
Radio Equipment : Reviews and Comparisons
  • Explaining ARRL Radio Tech Reviews - Explaining ARRL Technical Reviews of Radios a brief tutorial on radio testing. The ARRL Lab tests radio equipment according to standardized test procedures, using calibrated professional test equipment. Info on transmitter and receiver tests
    [ Hits: 118 | Votes: 0 | Rating: 0 ]
Shortwave Radio : Broadcasters : Time Signal Radios
  • MSF radio time signal - The MSF radio signal is a dedicated standard-frequency and time broadcast that provides an accurate and reliable source of UK civil time. It is available 24 hours a day across the whole of the UK and beyond. The signal operates on a frequency of 60 kHz and carries a time and date code that can be received and decoded by a wide range of readily-available radio-controlled clocks.
    [ Hits: 49 | Votes: 1 | Rating: 10 ]
  • Radio Station WWV - NIST radio station WWV broadcasts time and frequency information 24 hours per day, 7 days per week to millions of listeners worldwide. WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. The broadcast information includes time announcements, standard time intervals, standard frequencies, UT1 time corrections, a BCD time code, and geophysical alerts
    [ Hits: 52 | Votes: 1 | Rating: 10 ]
Software : Internet Linking
  • AllScan - AllScan is a free and open-source web app for AllStar nodes that provides Favorites Management features, AllStarLink Stats integration, and connection monitoring and control functions. Shows your favorites in a Dashboard summary table with Keyed status, Connected Node count and other statistics. Continually scans the status of each favorite using ASL's Stats API data showing which favorites are active and have recently been active. Allows favorites to be connected with a single click (optionally automatically disconnecting any currently connected nodes first). Allows the Favorites Table to be sorted by Node#, Name, Description, Location, etc. Favorites can be added/deleted simply by entering the node# and clicking a button. These features finally give AllStar nodes similar memory management and scan capabilities that analog radios have had for decades. AllScan is mobile-friendly and optimized for ease of use on both small and large screens. AllScan follows the latest web development standards, with PHP, JavaScript, HTML, and CSS cleanly partitioned, runs on both ASL and HamVOIP, and is very easy to install, configure, and update.
    [ Hits: 20 | Votes: 1 | Rating: 8 ]
Software : Weak Signal
  • VARA - VARA HF is a soundcard modem that can be found on the HF bands exchanging traffic (Winlink). VARA implements an High Speed Data Mode and comes in 2 separate programs VARA FM and VARA HF. VARA is a High Performance HF modem based on OFDM modulation. VARA Modem, brings state of the art Military grade technology to new and existing HF data. Introduces a new standard of technology available for Amateur and Commercial use. Designed for operation within a SSB Bandwidth of 2400 Hz.
    [ Hits: 103 | Votes: 1 | Rating: 10 ]
Technical Reference : Arduino
  • Arduino Flex Controller - Arduino Flex Controller can be used with the new Flex 6000 Signature rigs. It is a DIY project and in these pages you will find all the informations you need to build and program your own. It is a perfect companion when used next to the official SmartSDR program but it can be used in stand-alone mode, without a PC.
    [ Hits: 109 | Votes: 0 | Rating: 0 ]
Technical Reference : Arduino : Morse Code
  • CW Morse Decoder for Arduino - While there are quite a few standalone Morse Code or CW decoders out there, I wanted to tackle the problem myself and end up with both a great Arduino learning project and a decent portable decoder for when I'm out in the field operating QRP
    [ Hits: 199 | Votes: 1 | Rating: 10 ]
Technical Reference : Calculators
  • Resistor combination finder - If you need a non-standard resistor value you could probably realize a close match using two resistor. If you use two resistor in series it is quite easy to figure out which values give the best match; on the other hand, using a parallel connection it is not so easy (at least for me) to find a good combination. This resistor calculation tool shows which combinations of two resistors (series or parallel) gives a match better than the closest standard value, for the E12 (10%), E24 (5%) and E96 (1%) series.
    [ Hits: 54 | Votes: 1 | Rating: 10 ]
Technical Reference : Radio Frequency Interference
  • Understanding computer-generated RFI - Radio Frequency Interference (RFI) has always been a source of concern for the Radio Amateur. Until the recent introduction of complex circuitry in the home, our communications gear has been the main source of potential RFI. In this computerized age of ours, increasingly complex and sensitive receivers are being barraged by these and other sources of RFI.
    [ Hits: 84 | Votes: 0 | Rating: 0 ]
Technical Reference : Software Defined Radio
  • The UHSDR Project - UHSDR stands for UniversalHamSoftwareDefinedRadio. The project provides the firmware to run standalone HAM transceivers. It currently supports STM32F4 and STM32F7 MCU based QSD designs.
    [ Hits: 176 | Votes: 2 | Rating: 8.5 ]

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