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This page details the construction of a biquad antenna. The biquad antenna is easy to build, and provides a reliable 11dBi gain, with a fairly wide beamwidth.

A cost effective current-mode 1:1 balun can be constructed from a length of coax and a rod typically used for a broadcast antenna loop-stick, some electrical tape, cable ties, a length of PVC water-pipe and some connectors.

Here you will find information about wire antennas as well as directional beams.

N3ox 6 meter moxon rectangle, pictures and assembly notes

Visit the legendary FT-847 FAQ pages ! You'll find a huge knowledgebase especially for the Yaesu FT-847 Transceiver.

WV7U YC156 and 3CPX800 amplifier projects. See pictures, schematics, test data, links, and more!

Convert text into morse code. It does this by reading text from one of three sources: the Windows clipboard, a file, or you may directly type the text. WinMorse outputs the morse code as a standard windows wav file

Online radio planning system, allow you to generate accurate radio frequency predictions for anywhere on earth

SSTV program for the Linux platform with several functions written by ON1MH Johan. QSSTV is a Linux-based program for receiving and transmitting SSTV (Slow Scan Television) and HAMDRM (Digital SSTV) signals, compatible with MMSSTV and EasyPal. Key features include support for narrow band SSTV modes, gallery functionality for viewing received/transmitted images, repeater capabilities for both SSTV and DRM modes, PulseAudio direct interface, and CAT radio control. The software includes waterfall visualization, hybrid mode operation, and template editing features. QSSTV requires Qt5 and several other libraries for compilation, and operates with a three-window interface for receive, transmit, and gallery functions.

Based on Motorola MRF454, schematics and component list

Complete introduction to amateur radio, excellent resource for beginners.

Measuring SWR and things every CB'er should know

The W1GHZ Online Microwave Antenna Book online

Again, Kenwood TS-2000 modifications collected by mods.dk

Thierry LOMBRY, ON4SKY, develops in several long articles all you need to know about antennas, their design and performance, for both amateurs and SWL

The PSK31 philosophy, tips and tricks, sound files, how to get started, sound card setup and tips.

Radio sales to over 60 countries, source for all communication equipment, individual hobbyists, professionals and dealers.

Metropolitan Police Department - Washington, D.C.

HF VHF UHF amplifiers, designed by hams for hams, and morse keys manufacturer

Many Icom IC-746's suffer from intermittent or non-functioning LCD backlights. Here how it can be solved

Examines the current geopolitical landscape of Armenia, offering detailed reports on regional developments and internal political discourse. The station, _Radio Azatutyun_, covers critical discussions such as the potential for conflict in September, with one source suggesting a "war is coming, it won't be delayed," alongside ongoing debates about Armenia-EU visa liberalization, which is projected to require "another 2-3 years" for completion. It also highlights the contentious rhetoric surrounding the Prime Minister's interactions with displaced persons from Artsakh. The resource delves into significant international relations, including discussions between Bayramov and Araghchi on regional situations, and Iran's denial of recent negotiations with the US. It also features updates on former President Trump's demands for an additional **$200 billion** for defense and his assertion that "regime change" in Iran is effectively underway. Further content includes analyses of drone attacks in Baku, the proposed new Constitution, and local issues such as the delayed reconstruction of Gyumri's central market and the persistent problem of Vanadzor's temporary kindergartens. The platform also hosts podcasts like "The Choice is Yours," exploring the reliability of pre-election polls.

The page provides detailed information about the construction of a full-size 160M 3 element beam antenna and an 80M 5 element beam antenna on a 330ft tower. It includes specifics about the tower height, types of antennas, elements, gain, take off angles, front-to-back ratio, operating frequencies, weight, and dimensions of the beams. The content is aimed at amateur radio operators interested in building high-performance antennas for the 160M and 80M bands. This Antenna is now been destroyed and is no more operational.

The Bruce array is a simple, often-forgotten wire antenna array that is advantageous for 80 and 160 meters, where typical gain antennas are very large. This bi-directional broadside vertical array is only 1\4 lambda high and does not require a ground system. It offers substantially greater SWR bandwidth than the half-square or bobtail curtain. A 4-element Bruce array used by N6LF showed a gain of about 4.6 dB compared to a 1\4 lambda vertical with 8 elevated radials, with a 2:1 SWR bandwidth greater than 400 kHz. The antenna is simple and its dimensions are flexible.

GlobalTuners provides access to web controlled receivers. Listen to Ham radio, Tune Shortwave radio, Listen to Air traffic control, experience Airband receptio including ACARS and Airports. Tune remotely controlled receivers all over the world with your browser and get live audio.

This is a tracking page for a tv tuners based homebrew spectrum analyzer project.

Kantronics produce Modems, Tnc, Kam, Marine, wireless modems. Packet radio communication devices, HF E-mail, paging, GPS tracking, weather data gathering, or wireless data transmission.

VHF and VHF amplifiers including repeater rf amplifiers

SIMPLEX is a free windows program which transforms any transceiver into an audio repeater. It works on HF, VHF, UHF etc with SSB, CW, FM, packet, SSTV and every modulation mode.

Delta Loop Antenna for 15m band. This antenna is made for operating from outdoors, mainly from mobile shack. Drive to a parking you like, then build it up. Just half an hour later, you can enjoy slightly better gain than normal dipole.

DJ9BV yagi antenna for 2 meters band

A 2 meter power amplifier

Presents a catalog of **QRP** transceivers, antenna tuners, and related accessories for amateur radio operators. The product line includes the ZM-2 antenna tuner, designed for efficient impedance matching across HF bands, and the NW-series QRP transceivers, offering low-power CW operation. Additionally, the site details various ladder line insulators and specialized connectors, emphasizing robust construction for field deployment and home station use. Each product listing provides specifications, operational parameters, and pricing information. Compares the features of different **QRP transceiver** models, such as the NW-40 and NW-20, highlighting their respective band coverage and power output capabilities. The ZM-2 tuner's performance is detailed with typical SWR reduction figures for various antenna types, demonstrating its utility for portable and fixed stations. Customer testimonials and product images illustrate the practical application and build quality of EMTECH's offerings, providing insights into their durability and ease of integration into existing amateur radio setups.

This PDF document provided by AT technologies explains how to build the K9AY loop receiving antenna.

Quad, Yagi for low bands. Specialist in antennas, supports and moving of medium-large sized radio antennas, professional rotators, masts, towers, and accessories.

World time zones map with current time

Contruction notes of an Umbrella Loop antenna for AM shortwave listenings

Lots of information of hidding transmitters, building portable yagi antennas, s-meters, and much more

Home of the ultimate Ham Radio QSL Label Program! Quick QSL for DOS, featuring great color, dot matrix, laser, and inkjet printer support, a user-friendly interface,

U.S. Government's military handbook on grounding in pdf format

The cobweb antenna it is basically a 5 band antenna comprising of 5 full half wave dipoles for each band - between 10 meters and 20 meters, the antenna is also resonant on 6M and can be modeled even for VHF frequencies.

This design represents the smallest practical antenna for Oscar-13 mode-S. Perfect beacon reception at all times is possible, and acceptable SSB even at 43,000 km range.

Lyle Koehler's article on remote use of LF loop antennas for receiving purposes.

Description of a delta loop antenna for HF bands in french

Meter and Low Power Tune for FT-857D

Optimal Working Frequencies (MHz) for High Frequency (HF) / Shortwave Radio. By region, updated monthy.

A simple dual band VHF UHF jpole antenna Projects by Dale Kubichek

Another approach to hidden HF antennas

Amateur radio clip art for web pages, desktop wallpaper, newsletters and more!

This site provides free azimuthal maps for almost anywhere on the globe. Create your own azimuthal map for your location. You can customize the map in a variety of ways by changing the options in the web form

Benefits and limitations of an end feed antennas. By Peter Parker VK3YE - first appeared in Amateur Radio, June 1998