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692 links - and 5 categories

Advanced Antenna Modeling Book by ON5AU - A new book about modeling antennas with EZNEC and in particular in conjunction with the AutoEZ application for a total of 584 pages. The book include more than 3000 accompanied downloadable EZNEC model files
[ Hits: 451 | Votes: 9 | Rating: 6.23 ]

VHF Baluns: Fact and Fancy - Our ideas about HF baluns have changed dramatically in recent years. The focus today is very much on suppressing unwanted common-mode RF currents, to reduce both the received noise levels and the risks of causing interference on transmit.
[ Hits: 283 | Votes: 0 | Rating: 0 ]
Baluns and common mode chokes - Voltage baluns versus Current baluns. When to use them, differences, and typical usage in feeding antennas, or in resolving radio frequency interferences.
[ Hits: 402 | Votes: 1 | Rating: 10 ]

137MHz Quadrifilar Antenna - This version of the 137MHz quadrifilar antenna for APT reception is an adaptation from Bill Sykes and Bob Cobey Taming the QFH which appeared in the March 1997 RIG magazine. This article contains detailed 3D pictures and models and detailed pictures.
[ Hits: 232 | Votes: 3 | Rating: 7 ]

VHF-UHF Long Boom Very High Performance Antenna Designs - Experimental Long Boom Antennas - CP, LPDA, multiband with several NEC Files for 50MHz 144MHz 222 MHz 432MHz but also 902MHz and 1296 MHz Antenna projects. Includes also for each antenna model, in a general comparison table each antenna characteristics including Directive Gain, G/T, E-F/R, H-F/R abd Boom Length. This is a great value comparison table of several commercial and home made VHF UHF antenna projects.
[ Hits: 190 | Votes: 1 | Rating: 10 ]

Narrow FM Contest 2020 - The ARI Club of Lecce (Italy) is proud to present the first HF FM contest. This is the NARROW FM CONTEST which will debut the 6th and 7th of June 2020. It will last 24 hours and will take place on 10 meters exclusively in the FM emission mode.
[ Hits: 82 | Votes: 8 | Rating: 8.63 ]

North Wales Amateur Radio Group - North Wales Amateur Radio Group (NWARG) was formed in December of 2019 by a group of radio amateurs that yearned for a local club that encouraged it’s membership to use all modes of amateur radio, to experiment with radio, to learn about radio and above all to be friendly and supportive of all of it’s members.
[ Hits: 142 | Votes: 4 | Rating: 9 ]

Data Sound Samples - This page contains links to a variety of data signals that have been specially recorded. Each file contains a standard test message (the quick brown fox jumped over the lazy dog) repeated twice. The files can help you learn the characteristic sound of various data modes but they can also be used to make sure your decoder is working.
[ Hits: 250 | Votes: 0 | Rating: 0 ]

Retevis - Manufacturer of two way radios based in Shenzhen China. Retevis produce commercial, personal and amateur radio handheld and mobile transceivers, either for analog and digital modes. Retevis produce also two-way radio accessories and repeaters.
[ Hits: 203 | Votes: 2 | Rating: 5 ]

FSK vs AFSK - In the field of RTTY transmissions with audio boards, you can transmit either in FSK or AFSK mode. Which is better: FSK or AFSK? Advantages and Disadvantages of both methods
[ Hits: 156 | Votes: 0 | Rating: 0 ]

Amateur Radio Microwave - Introduction - Introdcution to Amateur Radio Microwave. A 21 page presentation of ham radio microwaves concepts for beginners. Frequencies, modes and activities. How to get started, what equipment is needed and some pictures of ham radio microwave station setups
[ Hits: 416 | Votes: 0 | Rating: 0 ]

Yaesu FT-991 Memory Manager - Free memory management software for the Yaesu FT-991 and FT-991A models. It runs only on Windows 7, 8, 8.1, 10 both 32 and 64 bits, it also permits basic remote control features and allow backup and restore settings and memories. Documentation in mainly in French.
[ Hits: 1429 | Votes: 7 | Rating: 6.61 ]

AirHamLog - Online Amateur Radio Logbook - AirHamLog is a modern logging software for amateur ham radio operators. The software works inside your browser, making it possible for you to use with any device connected to the internet. AirHamLog currently supports Windows, MacOS, Linux, iOS, and Android that works with modern browsers. AirHamLog has ability to export QSL cards as PDF files. All of your log data is stored on the cloud. You can start using AirHamLog for free today
[ Hits: 549 | Votes: 1 | Rating: 10 ]
TyQSL - Online Logbook - TyQSL is a modern Logbook by Hams, for Hams. A Place for other hams to take a look at your QSO statistics as well as search for QSOs in your Logbook that you made public. Just click onto your name in the Menu Bar when you are logged in to get to your public profile. Soma features includes Shows the users Valid Callsigns Look at QSO Statistics, Search Public Logbooks, Filters are avaliable to find QSOs fast Just share the Link on Social Media, QRZ, or Similar with other
[ Hits: 302 | Votes: 0 | Rating: 0 ]

sodiraSDR - Software Radio - Software Defined Radio (SDR) for analog and digital modulation modes, can demodulate AM envelope, AM synchronous, AM stereo, LSB, USB, FM, FM Broadcast, DRM30, DRM+
[ Hits: 363 | Votes: 4 | Rating: 8.75 ]

NanoVNA GitHub Repository - Very Tiny Palmtop Vector Network Analyzer by edy555. This is the original GitHub firmware repository implementing the standard 50KHz to 300MHz model
[ Hits: 151 | Votes: 0 | Rating: 0 ]

Raspberry Pi and Automatic NOAA Satellite Reception - How to receive automatically NOAA wather satellite images with a Raspberry Pi and a RTL SDR. This project requires a Raspberry Pi 3 Model B a common NooElec SDR Dongle and a QFH Antenna in the attic. Article explains how to setup and configure software but no instructions on antenna.
[ Hits: 520 | Votes: 4 | Rating: 4.75 ]

Hermes-Lite Low Cost HF SDR - The Hermes-Lite is a low-cost direct down/up conversion software defined amateur radio HF transceiver based on a broadband modem chip and the Hermes SDR project. It is entirely open source and open hardware, including the tools used for design and fabrication files. Over 300 Hermes-Lite 2.0 units have been successfully built.
[ Hits: 519 | Votes: 0 | Rating: 0 ]

Optocoupled Transceiver-PC Audio Isolator project - An optocoupled audio interface between PC and Transceiver for digital modes. The article includes full schematic of complete board and build instructions.
[ Hits: 197 | Votes: 0 | Rating: 0 ]
Apple MacBook interface for digital modes - How to make a custom Line In connector for apple macbook or iMac to connect your amatur radio transceiver. A simple modification of a standard USB audio interface can work.
[ Hits: 135 | Votes: 0 | Rating: 0 ]