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A 220-ft tower that has five catenary lines, each about 500 feet long. Four of these lines, running NE, SE, SW, and NW support four 1/4-wavelength wire verticals used in a 160-meter four-square antenna.

An home made end fed half wave antenna with a tuner box by NG0R

This sweeper built for a narrow bandwidth filter adjustment, use a simple 555 version sawtooth wave generator.

Discussion groups for Shortwave Listening, Propagation, Amateur Radio, and related topics.

SWR is Finland's first private shortwave station.

W-CODE is a professional digital mode decoder system capable to decode many digital signals on HF, VHF/UHF, SHF and SATELLITE bands.

A Flemish association of shortwave listeners

Design and manufacture application specific microwave and RF amplifiers, upconverters, downconverters and multifunction assemblies.

European free radio on shortwave and mediumwave.

Broadcasts national and international programs locally and to all world regions in over 30 languages on mediumwave FM, TV, RealAudio/TV and on shortwave.

The **Solarcon A99** vertical antenna, a half-wave over a quarter-wave variable mutual inductance design, primarily serves the 11-meter CB band but also finds use on 10 and 12 meters for amateur radio operators. Its simple construction, consisting of three fiberglass sections and a 16 AWG radiating element, makes it an accessible option for new operators or those seeking an easy-to-install base station antenna without complex mounting requirements. Despite claims of 9.9 dBi gain being widely considered exaggerated, and a manufacturer rating of 2000 watts power handling often viewed with skepticism (with 300 watts suggested as a practical limit), the A99 maintains popularity due to its low cost and ease of deployment. It typically tunes to a 1.2-1.3 SWR out of the box, requiring minimal adjustment via its two tuning rings. Its high angle of radiation allows for effective local communication even when mounted at low heights, such as 8-10 feet off the ground. However, the A99 is known for significant RF bleed-over issues, particularly when operated with higher power or mounted close to residential electronics. While its internal design is often described as cheap, the antenna exhibits remarkable durability, frequently lasting a decade or more in various weather conditions. Its affordability and straightforward setup continue to make it a go-to choice for many radio enthusiasts.

This is about Small Antenna types and their properties which can help choosing proper antenna for high-frequency wireless communications as: two-way radio, microwave short links, repeaters, radio beacons or wireless telemetry

An economical dipole for simple QRP HF homebrew rigs

A versatile hybrid synthesizer for UHF and Microwave Projects

Broadcasts Bible teachings in 15 languages to all world regions on local media such as mediumwave, TV and FM, via international shortwave radio and Internet radio and TV.

Organized to promote operation on the amateur bands above 420 MHz

Top quality Microwave Phase Locked oscillators for DB6NT, DEMI and homebrew microwave transverters, and other support products.

Real-time dashboard with 3000km optimal working & maximum usable frequency as well as maximum NVIS frequency; all for your internet access location.

Allow the reception of amateur signals on domestic AM-only short wave receivers article and project by VK3YE

NVIS antennas, also known as Near Incident Vertical Skywave antennas have a high angle of radiation. Something on the order of 60 degrees, to straight up to 90 degrees. A portable, easy to setup and cheap nvis antenna project.

Amateur Radio organization specializing in VHF, UHF, and microwave communications.

A group for the purpose of buying-selling-trading SW receivers and scanners only. Free and mainly for individuals.

Amateur Radio 40m 20m 15m Half Wave Fan dipole antenna project with part list, pictures and drawing. Includes the option to expand the antenna to cover the 80 meters band

Introduction to Shortwave Antennas. Understanding Shortwave Radio Listening and Antenna Design and Construction

A quarter wave antenna with dimensions for uhf and vhf bands

The radio voice of Canada broadcasts daily programs in French, English, Spanish, Arabic, Chinese, Russian and Ukrainian, on shortwaves, satellite and via RealAudio.

Simple 6 Metre DX Antenna based on an article by LB Cebick in QST May 2002 on a Quad Turnstile antenna. This antenna is basically two full wave loops mounted at right angles fed 90 degrees out of phase to produce an omni-directional horizontally polarized pattern

Projects you can build, an amplified shaped sine-wave oscillator

This method of construction can be used on most UHF through \"low\" microwave Yagis, and is especially useful for the 33, 23 and 13 cm bands

Free radio nova on Shortwave

RF Systems develops and produces antennas and accessories for governmental and military organisations, shortwave and scanner listeners, radio amateurs, yachting circles and professional users of receiving and transmitting equipment.

A very brief introduction to microwaves, by Thomas D. Williams, Ph.D., radio amateur WA1MBA

Message list about 903 Mhz. and above bands. Use various VHF reflectors for the 432 and lower bands. Most traffic will be about 2304 and above.

Radio New Zealand International is a Shortwave Broadcaster. Our broadcasts are beamed to the island nations of the Pacific but can also be heard in other parts of the world.

Home page of PA3BTL with information on Linux, packet radio, sattellite keppler data links, Proxim RangeLAN2 2.4 GHz radio's, Lucent WaveLAN 2.4 GHz radio's and link to LXE homepage

An end-fed-half-wave antenna matcher project based on a FT-82-43 core with a 100 pF and 45 pF capacitor in parallel

Radio for Peace International (RFPI) is a Global Community Radio Station located in Costa Rica, Central America that broadcasts progressive news on shortwave radio and the internet on topics of Peace, Human Rights and the Environment. RFPI gives a voice to the voiceless by promoting democratic communication.

A sweep generator that produces a sawtooth waveform which sweeps the oscilloscope beam from left to right via its X input, and simultaneously the VCO frequency.

Democratic Voice of Burma is a multimedia organization focusing on Burma - Myanmar. We provide impartial news, information and analysis about Burma. We have two hour daily radio broadcast to Burma via short wave, promoting press freedom, democracy and human rights. Our news is available in Burmese, English, Arakan, Chin, Kachin, Karen, Karenni, Kayan, Mon and Shan languages.

Janielectronics RF microwave devices online store

The HarRe antenna series, multi element quarter wave resonant broadcaters band receiving antenna

Online in RealAudio and Windows Media formats, with multiple language shortwave schedules, and instructions for receiving Australian satellite radio and TV (AusTV).

Yugoslavia's only external broadcast shortwave station; it broadcasts to all world regions in eleven languages.

Provides broadcast times, frequencies and power of the network emissions. Airs mediumwave, FM, shortwave and RealAudio broadcasts

Operates Singapore's largest radio network with 11 FM stations and 3 shortwave stations providing sound entertainment and up-to-the-minute news and information locally and internationally.

Broadcasts to Western Europe on AM/FM and shortwave 9710 kHz, to Russia on shortwave on 9555 kHz, and to North America on shortwave on 9855 kHz.

A handy solution to have a half wave antenna for fieldwork on a 12m fishing rod.

Linux for shortwave and amateur radio monitoring. Supports popular SDR hardware and online streaming from KiwiSDR, WebSDR, and Spyserver sites. Articles about using Linux with your SDR devices.Skywave Linux, an innovative operating system, leverages cutting-edge technology for seamless access to radio signals globally. Ideal for regions with limited internet access, it effortlessly connects to a network of SDR servers, offering high-performance SDR operation without the need for extensive hardware. With pre-installed and configured SDR software, Skywave Linux simplifies signal discovery and operation for all users.

Presents the VHFDX.EU web cluster, a specialized resource for VHF, UHF, and microwave DX spotting. It details the cluster's functionality, including real-time spot aggregation and a DXCluster Map interface for visualizing activity. The resource highlights its integration with the MMMonVHF backbone, ensuring a robust data flow for monitoring band openings and propagation events across higher frequencies. It also references reviews of the ON4KST and N0UK chat systems, which are frequently used in conjunction with VHF DX operations. The platform offers a mobile-optimized view for on-the-go access to DX spots, catering to portable and mobile operators. It further provides daily ES (Sporadic E) spot summaries, a critical feature for VHF operators tracking this specific propagation mode. The cluster serves as a central point for operators to share and receive information on rare grid squares, contest activity, and general band conditions above 50 MHz.

Design a parallel circular wire balanced transmission line with this online calculator. This calculator is a tool for designing balanced transmission lines with a specific desired characteristic impedance Zc and made of parallel circular conductors of a given diameter d.