Search results

End-Fed antennas are NOT balanced systems; but neither are verticals, ground planes, discones, windoms, zepps, Marconis, half-slopers, et al. Additionally, the low-impedance antenna port of your transmitter/receiver is not balanced.

A Kenwood R-5000 communications receiver located in Salt Lake City that you can remotely control and receive S-Meter readings and audio from via a web browser.

The DSP-10 is an amateur-radio, software-defined 2-meter transceiver that can be built at home. It operates not only on SSB, FM and CW, but also on four Weak-Signal modes. Features are tailored to operation on VHF, UHF and Microwave frequencies. By W7PUA

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.

Freeware antenna software that lets you see what the polar diagram of your rotatable beam actually looks like where it is operating. With PolarPlot you can measure the polar diagram of the antenna and check for abnormalities - compare plots taken before and after changes to the design or location - check the -3dB beamwidth - look at the front to back ratio - see the size and position of the sidelobes.

Macintosh automatic position reporting system, developed by Bob Bruninga, WB4APR, to track boats and vehicles using GPS and packet radio. MacAPRS was written by Keith Sproul, WU2Z and Mark Sproul, KB2ICI

A site for collectors, users, restorers of the historic World War Two radio, The Wireless Set No. 19, built in the UK and Canada, and used by many Allied armies.

design by Brian Williams, GW0GHF

AM loop antenna for 75/80 meters band

Don't buy or build a semi-vertical trap antenna until you read this article! If you can use a drill, saw and screwdriver this is a simple project.

An assortment of Amateur Radio-related technical articles written for the JUG, the newsletter of the Northern California Contest Club. Topics include unique but simple and useful radio modifications and accessories, and rig reviews.

A Crank up mast pipe by Bob Bruninga

80 meter vertical experiment by Bob Raynor N4JTE

This project outlines the construction of a 3-element reversible quad antenna specifically designed for the 40-meter band. The materials required include pushup towers, pressure-treated posts, insulated wire, and various electrical components such as relays and a balun. The construction process is straightforward, beginning with the installation of the posts in a straight line, followed by the assembly of the antenna elements and their elevation to the desired height. The antenna's design allows for directional signal reception, making it ideal for operators looking to enhance their communication capabilities on the 40-meter band. The project includes detailed instructions on tuning the antenna for optimal performance, ensuring that operators can achieve the lowest SWR possible. Additionally, the design can be adapted for other bands by extrapolating dimensions, providing versatility for amateur radio enthusiasts. Overall, this reversible quad antenna project is suitable for both beginners and experienced operators, offering a practical solution for improving signal strength and directionality in 40-meter communications.

2 element reversible verticals, small footprint, big results.

FT-1000MP Automatic Band Selection Interface Bob Wolbert, K6XX

Antenna adaprter mods fot the Kenwood TH-F6A or TH-F7

Simple, low cost interface between Kenwood serial ports and contest logging programs by Bob Wolbert, K6XX

QRPPAL, developed by WB2QAP, functions as a freeware QRP logging application for Windows 3.1 and Windows 95, initially introduced at the 1996 Dayton Hamvention FDIM QRP symposium. The software integrates the original "Logger" program, which was specifically designed for ARCI contest dupe checking and logging, alongside versions tailored for NW-QRP, MI-QRP Club, and Colorado QRP Club contests. It is distributed as a self-extracting archive, _qrppal!.exe_, approximately 1.2 MB in size, which unpacks _qrppal.exe_ and _setup.exe_ for installation. The program's modular design incorporates extensive QRP-centric databases, covering ARCI awards, QRP club listings, QRP periodicals, kit/vendor directories, and detailed rig reviews, often with photos. Noted reviewer Bob Gobrick, _VO1DRB_, described it as a "QRP Internet Web Site in a box" due to its comprehensive data modules, which are also user-modifiable. Installation involves running _setup.exe_ to create batch files like _setup95.bat_, which then establish a c:\qrppal directory and deploy the program files. Users initiate the application by typing "qrp pal.tkn" after setup. The Colorado QRP Club contest version should be avoided due to specific first name exchange requirements not supported by that module.

YAESU Distributor for Greece, Cushcraft, Maldol, Diamond, Surveilance and CCTV equipment

Exaustive introduction to PSK31 and Hellschreiber by Bob Rushby

External Amplifier Keying from the IC-706 by Bob Wolbert, K6XX

What to have before you go.

An Attic version for limited space applications by NW9T

Bob's Electronics serve a wide market of customers throughout the Midwes, supports brand names such as Bendix King, ICOM, Relm, Uniden, Antenna Specialist, Antennex, Cushcraft, DB Products, Maxrad, Sinclair, and numerous others.

The Skeleton Slot Antenna Revisited by Bobby Brainwave, N3VGS PDF File.

DX Finder presents a real-time DX cluster service tailored for amateur radio operators engaged in DX chasing and contesting. The platform aggregates DX spots, Reverse Beacon Network (RBN) data, and PSK Reporter information, displaying current activity across various amateur bands. It provides a centralized interface for monitoring propagation conditions and identifying rare DX entities, aiding operators in making timely contacts. The service integrates multiple data streams to offer a comprehensive view of global amateur radio activity. Users can access real-time spotting data, which includes callsigns, frequencies, modes, and signal reports, facilitating efficient station operation. The inclusion of RBN and PSK Reporter data enhances situational awareness, allowing operators to assess band openings and signal paths more effectively. DX Finder supports both web and Telnet access, catering to different operational preferences. It also features a dedicated JOTA cluster, specifically designed to support the Jamboree On The Air event.

Broadcast Tower Specialist. Offering Manufacturing, Engineering, Erection and Tower Extension Services. Self Supporting or Guyed Towers.

A project of a bobtail-curtain antenna for 10 MHz

Rutherford County Sheriff and Fire Live Scanner Audio Feed on RadioReference.com

Demonstrates how to construct an automatic band decoder, moving beyond manual selector switches for antenna and filter control. It addresses the challenge of varying band data outputs from different transceivers: Icom rigs provide voltage values, Yaesu rigs use Binary Coded Decimal (BCD), and Kenwood rigs lack direct band data output. The resource highlights a clever solution utilizing logging software like _CT (K1EA)_ and _DX4WIN_ to emulate Yaesu's BCD output via a PC's printer port, making the decoder compatible with any rig. The author details experiences building decoders based on designs by Bob _K6XX_ and Guy _ON4AOI_, noting K6XX's simple TTL chip design and ON4AOI's more comprehensive, opto-isolated unit capable of controlling ten outputs and bandpass filters like the _Dunestar_. It also references a _W9XT_ board design, which Steve Wilson, G3VMW, modified with BD140 transistors for source drivers, emphasizing safety. The author successfully cased an ON4AOI-based decoder in an old modem case, connecting it to an FT1000MP or a PC printer port to drive remote relays and a Dunestar Band Pass Filter.

Practical applications for end-fed antenna transformers and safe, effective grounding

Freeware general purpose and contesting logging application, Scoring function for the IBM QSO Party with unique export format. Cabrillo export for non IBM contests includes formatting for NA QP, CQ WW DX, NA Sprint & CQ World-Wide WPX by W0RY

Activating a county for ham radio can be dangerous to your health!

"W2IK's Personal experience being the first responder at ""ground zero"" during the WTC 9/11 disaster."

A very interesting blog article on a real world comparison on the popular multiband wire antenna, the G5RV, by Bob Raynor N4JTE

Amateur Shortwave Radios Links and information,Also Swap Radio Groups Bearcat-scanner Drake Radios Hallicrafters and more

VE3BDB's personal page serves as a dedicated resource for members of the Radio Amateurs of Canada (RAC) residing in the Ontario South Region. Bob Cooke, VE3BDB, previously held the position of Director for this region, offering localized support and information pertinent to the RAC's activities and initiatives within Ontario South. The page likely covered regional news, events, and specific guidance for local hams, reflecting his role in facilitating communication and engagement among the amateur radio community in that area. While the page is no longer active and Bob Cooke has transitioned from his regional director role to RAC Vice President for Field Services, its original purpose was to centralize information for Ontario South hams. The content would have been tailored to address regional concerns, promote local ham radio activities, and provide updates relevant to RAC members in that specific geographic area, directing users to the main RAC website for current information.

NHARC serves the Amateur Radio community in the greater Pittsburgh area USA.

Kentucky farmer invents wireless telephone! But was it radio? Facts and folklore about Nathan Stubblefield by Bob Lochte.

FRC since 1927, contesting is supported by an extensive PacketCluster Network

Post on a W3EDP experience by Bob Kellogg, AE4IC

Radio Strike from sicily

The only worldwide amateur radio repeater directory. Supports Android, iPhone, web, RT Systems, CHIRP GPS enabled. AvMap, Garmin, TomTom

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

Contesting, IOTA, DXPeditions, DX, and much more.....worth a click!

Home page of the Siskiyou County Amateur Radio Association located in northern California; Club Call Sign is K6SIS.

Bravo Delta DX Group from Poland

Arizona contest club for big guns, little pistols and cap guns, from experienced to new contesters.

Supplier of RF, Microwave, & Wireless passive coaxial components, including Coaxial Attenuators, Adapters, Cables, DC Blocks, Terminations, & Connectors