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

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

We worry a lot about Standing Wave Ratio (SWR) in amateur radio since SWR is one indication of how well our antenna system is working. Most HF transceivers and antenna tuners have built in SWR meters. SWR is a measure of a transceiver' s output power verses the portion of that power reflected by the antenna system

You'll find more than 330 Amateur Packet Radio Gateways on world maps.

This project details three variants of a vertical half-wave antenna design for the 4-meter (70MHz) amateur radio band. The antennas use end-feeding with a parallel-tuned circuit for impedance matching to 50-ohm coaxial cable. The first variant uses suspended flexible wire for portable use, the second employs a fiberglass rod with internal wire for permanent outdoor installation, and the third utilizes aluminum tent poles for quick mobile deployment. Despite the narrow bandwidth of the matching circuit, this suits the narrow 4m FM allocation well. The design offers an effective omnidirectional radiation pattern and can be constructed with readily available materials.

The article provides detailed instructions on how to build a half-sloper antenna for the 160 meters band. It explains the concept of a sloper antenna and how it differs from a slooper. The article includes practical tips on the construction and installation of the antenna to ensure optimal performance. The intended audience is amateur radio operators interested in building their own antenna for the 160 meters band. The content is informative, practical, and focused on DIY antenna building.

Some tens of very special audio files recorded during amateur radio activities like aurora traffic, meteor scatter, communications with ISS crew and the sound of various transmission modes that you can hear on HF and VHF bands

The page provides a detailed guide on building a successful 160 Meter short TX loop antenna, with specific dimensions and tuning instructions. It includes information on the design, construction, and tuning of the antenna, as well as the materials required. The intended audience is amateur radio operators looking to build an effective antenna for the 160 Meter band.

Commercial amateur radio logging software for windows. Full featured logging, HF radio control, Internet Packet, VHF Packet, Label Designer, Report Designer, and a lot more.

AirLink Express is a user friendly digital mode software package for the Amateur Radio Operator. The software is compatible with Microsoft Windows XP and Microsoft Windows Vista. It offers PSK, MFSK and RTTY digital modes with logging and macro capabilities. If you have ever used the Digipan software you will be immediately familiar with Airlink Express. The user interface is almost identical by Alex Krist, KR1ST

FBB is a freeware bulletin board software for amateur packet-radio run on DOS Windows and Linux

BBLogger, is a Free windows Logging software to fully manage you Amateur or Short Wave Listener Radio Station. Offer several fatures including Rig control, Cluster interface, mapping features, Awards and DXCC management, LoTW, Label printing, QRZ lookup and more by IK2VIW and IK2UVR

RXCLUS is a free windows amateur radio software especially designed for the DX'ers and SWL's wanting to receive the informations transmitted by packet radio on the DX-cluster system. It supports also telnet protocol.

Amateur Radio and 2-way commercial Radio Dealer. Sales and service for ICOM Radio Products. CB Radios, antennas and installations. Spread Spectrum Radio modems.

Amateur Radio, Citizen's Band Radio, Commercial Radio, General Electronic items, Marine Radio, and Short Wave Radios.

Multiband Center-Loaded Off-Center-Fed Dipole (CL-OCFD) antenna that work on 80m 40m 30m 20m 15m 10m. The Center-Loaded Off-Center-Fed Dipole (CL-OCFD) antenna, developed by Serge Stroobandt, offers a versatile solution for amateur radio enthusiasts, covering multiple HF bands (80, 40, 30, 20, 15, and 10 meters) without the need for an antenna tuner. This innovative design utilizes a capacitor for resonance on the 80-meter band and a resistor to manage static charges. The CL-OCFD enhances bandwidth and simplifies operation, making it a significant advancement on OCF Dipole design.

A very easy to use program to decode DTMF dial tones found on telephone lines with touch tone phones. The DTMF Decoder is also used for receiving data transmissions over the air in amateur radio frequency bands.

Ham Radio Audio Stream: listen live to German amateur radio repeaters.

Harv's Hamshack Hack. A remaster of the KNOPPIX distro for Amateur Radio Operators (Hams) who have no prior experience with Linux. Provides a complete OS, software for hobby, web, and word tasks. All contained in an .iso file ready to burn to CD.

This site is dedicated to electronics hobbyists, engineers, and Radio Amateurs interested in circuit design, homebrew and kit projects.

This page describes a homebrew 80/40 meter trap vertical antenna. Includes an interesting antenna raising system that allow easy setup and tuning.

Amateur Ham Radio Repeater in Google Maps. View by state or specific location.

Lookup callsign histories & applications, available Amateur Extra callsigns, vanity callsign predictions, and more. Updated from FCC data several times a day.

A large jpeg DX World map that include ITU Zones, grid squares and prefixes. This high-resolution DX World Map is an essential tool for amateur radio operators. It clearly displays ITU zones, CQ zones, grid squares (Maidenhead Locator), and DXCC prefixes, helping you to plan QSOs, track propagation paths, and participate in global contests. Whether you are a seasoned DXer or a beginner, this map provides a clear, detailed view of the radio world, improving your station's efficiency and geographic awareness. Available in JPEG format, it's perfect for display

Merging Internet technology with Amateur Radio holds great promise. This article discusses the authors experiences in putting several Internet Remote Base stations on the air. By Stan Schretter, W4MQ, Brad Wyatt, K6WR, and Keith Lamonica, W7DXX

Les relais Francais, map of ham radio repeaters in France

Freeware amateur radio transceiver control program tested with IC-756 Pro.

This article describes the construction of a Moxon rectangle antenna for the 70MHz (4-meter) amateur radio band. This compact two-element beam design features folded element ends, reducing its width to approximately 75% of a half-wavelength. The antenna was built using enamelled copper wire stretched over a lightweight fiberglass kite spar frame, with a direct coaxial cable feed connection. Initial testing showed a VSWR of around 1.3 with distinct nulls at 90 degrees when horizontally mounted. The author later tested vertical polarization and suggested that the antenna's compact size might allow for indoor loft installation.

MacTNC is simple, configurable terminal software used by amateur (ham) radio operators to control a TNC (terminal node controller). MacTNC performs most of the same functions of other terminal software, but includes buttons for standard commands, and allows the user to configure additional buttons for special purposes. MacTNC works only user Mac OS X because it relies on Unix components of the current operating system.

Electronic World atlas for radio amateurs. DXCC and province prefixes, CQ and ITU Zones in the rectangular and azimuthal projections, continuous zoom and scrolling, Gray Line, city and island index, unique hierarchical prefix database. COM/OLE Automation for easy integration with 3-rd party programs.

ML&S UK Ham Radio Store dealer for top amateur radio manufacturers, cb radio, marine avionics and commercial products.

The UDY-2 Voice Keyer digital voice keyer amateur radio software utility integrates many popular voice keyer features in one convenient easy to use program. Whether you're working a contest as multi op, single op, running a net, or just plain rag chewing the UDY-2 Voice Keyer has something to make hamming more fun and convenient for you.

US, Japanese Australian and UK amateur radio licensing statistics including FCC database licences analysis and reports with geographical charts. A complex report generator is also available with current data.

A very interesting and informative introduction to the 50 MHz band, also known as 6 meters or better the Magic Band, by Dave Finley N1IRZ, covering different propagation modes, operating experiences, and the excitement of the band. The content provides insight into the unique characteristics of six meters and its unpredictability in signal propagation.

Article by DK5WL describes a multi-band DX antenna for the 160m-40m amateur radio bands with low visibility but great performance for long distance communication.

Manufacturers of a growing line of Amateur Radio accessories, electronic kits, and unique gadgets including Whiterook morse keys and keyers

Radio Mods, Technical Data, where to Purchase Equipment Amateur Repeater Coordination. All you need to build a repeater

This page describes the loading coil (inductor) that W8WWV built for my center-loaded 160 meter band (1.83 MHz) vertical antenna.

Perfect ground vs. poor ground. What is the difference? How does the ground influence the DX-gain?

This document by W4HM explains the construction and usage of a 160 meter balanced coaxial receiving loop antenna, which can be easily adapted for the 40 and 80 meters bands. The content provides detailed instructions on building the antenna, its advantages, and how to optimize its performance for amateur radio operations. It is a valuable resource for radio amateurs looking to improve their receiving capabilities and enhance their overall radio communication experience.

This listing was put together by ve7vdx on the USENET rec.radio.amateur.space, and is updated weekly there

There are many ways to support an amateur radio antenna. Installatio of a utility pole will provide an antenna height of approximately 13 meters (40 feet) and will require no guy wires.

Review of the W5GI Multiband Mystery Antenna by July 2003 Issue of CQ Amateur Radio

Windows programming software for Icom and Yaesu amateur radios and scanners and receivers by RT Systems. Produce radio programming cables for Yaesu Icom Kenwood radios

A half sloper antenna for 160 meter band Italian translation of a WD8DSB article appeared in a QST issue during 1998. This article presents a **Reduced-Size Half Sloper Antenna for 160 Meters**, designed for amateur radio operators with limited space. By utilizing a 40-foot tower or a tree, you can build an efficient antenna that slopes down, achieving a 2:1 SWR bandwidth of 120 kHz. This innovative design allows for effective communication on the "Top Band," making it ideal for winter DXing.

The document is a PDF detailing the construction of the DBJ-1 VHF-UHF Dual Band J-Pole antenna for amateur radio use. It provides instructions on how to build a high-performance dual band base antenna for VHF and UHF bands using a single feed line for less than $10.

Amateur radio Services by the Federal Communications Commission.

Freeware real time DSP filter particularly for applications of amateur radios , IIR, FIR filter, low-pass, high-pass, band-pass filter, band suppressor (notch filter) individually adjustable

MMVARI is a multi-Mode SoundCard Ham (Amateur) Radio program for receiving and transmitting the RTTY-PSK-FSK-MFSK modes. The program was written to experiment with the efficiency of transmitting Japanese and East Asian languages (HL/BV/BY) using the VARICODE

Online Catalog & storefront (NJ) sales of amateur radio & related items.