101science.com

Full amateur radio resource and links to radio electronics, astronomy, science, math, and much more.

73 Amateur Radio Today

Ham to Ham Column spanning amateur radio operating tips, technical ideas & suggestions, computer related tips, shop & shack shortcuts, troubleshooting techniques, & other related topics helpful to fellow hams in the pursuit of their hobby.

A-1 ServoMotor Repair
888336-8430 / Irving, TX

AC/DC servo motor repair service specializing in the repair of AC servomotors, DC brushless and servo motors, spindle and stepper motors, encoders, and resolvers from many manufacturers.

Advanced Specialties

Amateur, scanner & CB equipment.

AG6K

Amplifiers & accessories, articles.

Air Force MARS

U.S. Air Force Military Affiliate Radio System. The program consists of licensed amateur radio operators who are interested in military communications.

Alinco Electronics

Radio parts & repair, online manuals, power supplies.

All-Risk" Ham Radio Equipment Insurance Plan

Protection from loss or damage to your amateur station and mobile equipment by theft, accident, fire, flood, tornado, lightning, and other natural disasters. You can even insure antennas, rotators and towers!

Alpha Delta Communications, Inc

Commercial quality products for effective RF management, quality accessories for commercial and amateur radio communications.

Aluma Tower Company, Inc

Manufacturer of lightweight aluminum towers, portable & mobile, including telescoping, fixed & guyed, single section, meteorological, environmental, trailer shelter, vehicle mounted.

Amateur Electronic Supply

Amateur Radio supplies, radio control, rockets, scanners, marine & CB, telescopes.

Amateur Radio Page

S56AL (ex S57NAN), by Aleksander Stare.

Amateur Television Quarterly (ATVQ)

Quarterly publication about amateur television and SSTV with construction articles, local activity, ATV repeater information, building of antennas, RF filters, helium balloons and R/C models with ATV and more.

Amateur Radio Banner Exchange

Amateur radio banner ads exchange.

Amateur Radio UK Forum
UK

Forums include UK operating/band discussion, technical discussion, equipment, UK classifieds.

Amateur Radio Pages, United Kingdom

G6DPP David's Home pages.

Amateur Radio Research and Development Corporation (AMRAD)

Develop skills and knowledge in radio and electronic technology, advocate design of experimental equipment and techniques, promote basic and applied research, organize technical forums and symposiums, collect and disseminate technical information and provide repeaters.

Amateur Radio World Ring

Linking radio ham sites from all round the world.

AMECO Publishing Corp

Text books relating to amateur radio (HAM radio), highpass and lowpass power filters, transmitter test loads (dummy loads), study tapes and disks to learn morse code, transceiver preamplifiers, antenna signal boosters.

American National Standards Institute (ANSI)

Administers and coordinates the U.S. voluntary standardization and conformity assessment system.

American Radio Relay League

ARRL - Here's your invitation to a friendly, high-tech hobby that's got something fun for everyone! You can become an Amateur Radio operator. People from all walks of life pass their entry-level exam and earn their Amateur (ham) Radio license. They all share the diverse world of activities you can explore with ham radio.

Ameritron

The high power specialist - amplifiers, antenna switches, tuners, watt meters, relay buffers, tubes & parts.

Amidon

Supplying the HAM radio community with ferromagnetic products.

AMSAT (Radio Amateur Satellite Corp)

North American branch of the international amateur radio satellite community.

Angle Linear

Manufactures linear Radio Frequency (RF) products and peripherals for communications, specializing in preamplifiers, receiver front end filtering & receiver multi-couplers for virtually any communications application. Our specialty is high dynamic range, low noise figure receiver front ends to help you solve your communications problems.

AntennX

Antenna eXperimentation online magazine serving the business of communications throughout the globe. Ham operators endeavor to make contact with others around the world & antenneX© provides a central place for everyone to readily discuss their experiences with problems and/or successes in this field of radio signals.

Antique Electronic Repair
847-746-4532 / Zion, IL

Repair and restoration of tubed antique radios and musical amplifiers. Also, the repair of tubed and solid-state Ham radio equipment. Kit building services, antenna and grounding products.

Antique Electronic Supply

Serves the antique radio restoration market, amateur radio, audiophile and musical instrument markets with the broadest inventory of electron tubes, parts, supplies, and literature for vacuum tube equipment.

Army MARS

U.S. Army Military Affiliate Radio System. The program consists of licensed amateur radio operators who are interested in military communications on a local, national, and international basis as an adjunct to normal communications.

Array Solutions
972-203-2008 / Sunnyvale, TX

RF Network Designer - provides a number of functions for the professional radio operator and the ham radio community
YagiStress™ - mechanical design software for building safe & reliable antennas, antennas, stacking & phasing devices, high power antenna switches, Baluns, impedance transformers, custom antenna arrays & switching systems.

Associated Radio Amateurs of Long Beach

ARALB Manages W6RO Club Station aboard the Ocean Liner Queen Mary in the Wireless room located on the Sport Deck, Queensway Bay, Long Beach Harbor, Long Beach, California. The Wireless Room features a Ten Position Radio Station. Volunteers operate W6RO during three 4 hour " shifts " daily and establish communication all around the world.

Association of North American Radio Clubs (ANARC)

Federation of North American radio monitoring clubs.

Barker & Williamson Corp (B&W)

Manufacturer of the highest quality HF broadband antenna, air wound coil stock, and other radio parts for military, commercial, homeland defense and amateur use since 1932.

BAZ Spezialantennen
Bad Bergzabern, Germany

We produce directional antennas (quad, Yagi, dual band, cross Yagis) for 2m, 70cm,23cm and 13cm,also WLAN antennas. In addition we produce ferrite antennae for VLF, LF,MF, HF, Sferics, 137 MHz, Navtex.

Bencher, Inc

HAM radio and photographic equipment including paddles, keys, filters, antennas.

BlueSky Mast, Inc
877-411-6278 / Tampa, FL

Light weight, portable mast systems from 2 - 20 meters, Designed for one-man portability and light weight, they easily deploy in the harshest of environments with no need for external supports such as shelters or vehicles.

British Amateur Television Club

Encourages and co-ordinates the activities of amateurs involved in all aspects of television as a hobby.

Buckmaster Publishing

Buckmaster produces HamCall™ A comprehensive world wide amateur radio callsign database with over 1,700,000 listings.

Byers Chassis Kits
717-292-4901 / Dover, PA

Manufacture of aluminum chassis kits and cabinets. Small sheets of aluminum and brass. VHF and UHF antenna parts.

Cheapham.com

Dealer for ADI, ARRL, Westmountain Radio, Heil, Larsen and more.

Cheap QSL's

Quality low cost QSL card printing.

ComDaC

Amateur, commercial, marine radio equipment, computer systems.

Communication Concepts, Inc (CCI)

Provides components to amateurs who want to construct their own gear and to professionals who want to save money and time in prototyping their circuit design.

Communications & Energy Corporation

Manufactures & sells custom passive microwave filters within frequency ranges 5 MHz to 13 GHz, for wireless television (MDS/ GWCS/ MMDS/ ITFS/OFS), cable television (CATV), low power television (LPTV), cellular telephone & personal communications (PCS).

Communications & Power Industries, Eimac

Designs and manufactures a broad line of power grid tubes which are used in key markets including broadcast transmitters for AM Radio, FM Radio, VHF television, UHF television, & shortwave. These transmitters range from 100 watts to 500 kilowatts of RF power - and frequencies from audio to 2 gigahertz.

Communications Specialists, Inc

Manufacturers Of quality tone signaling equipment.

CQ Amatuer Radio Magazine

Radio Amateur's Journal - independent magazine devoted to amateur radio.

Dallas Remote Imaging Group

Provides consulting services on weather satellite imagery, satellite tracking, and the use of image acquisition and processing in education.

Dan's Small Parts & Kits

Virtual online internet catalog - transistors, MOSFETs, voltage regulators, linear & other IC's, diodes, crystals, transformers, sockets, heat sinks, potentiometers, dials, switches, ferrites, capacitors, connectors, & hardware.

Davis RF Co

Provides electronic and electrical wire, cable, RF connectors, DSP audio filters, rope, non-conductive guy cables for aerial or tower support; plus sundry aerial related parts.

DC Electronics

Home of DC Kits - electronics projects & kits, RF parts, diodes & LEDs, transistors, data sheets, advice.

Digital Communications, Inc

Specializes in Radio Frequency Interference (RFI) products, which reduce interference problems in the 50 MHz to 6 GHz range. We design & manufacture VHF & UHF bandpass filters, low pass filters, wi-fi filters, multiple-window filters, combiners, broadband duplexers, tower-top amplifiers, & CDMA repeaters.

Do-It-Yourself 2.4ghz Antenna

Free Do-It-Yourself information.

Downeast Microwave

Amateur Radio equipment for 50MHZ and above.

eHam.net

Ham Radio on the net. Classifieds, Ham exams, links, tests, event calendars, and much more for the Ham.

Electric Radio Magazine

Published primarily for those who appreciate vintage radio gear and those who are interested in the history of radio.

Electronic Rainbow

Manufacturer of electronic kits for the hobbyist as well as for education.

Elktronics

ID chips.

EZNEC

Antenna software by W7EL.

F5RDH

You will find here some achievements concerning ham radio activity. The majority of the these achievements were the subject of a publication in MEGAHERTZ Magazine, Radio-ref. Magazine or in RadioKit Electronica. All information necessary to the manufacture of an assembly, CAD files, and the software are available. Do not hesitate to contact me for further information.

Far Circuits

Manufacturer of Printed Circuit Boards for electronic projects that are used by the Amateur Radio and electronic hobby enthusiast.

FastLinks LLC

Specializing in design, implementation and support of wireless wide area networks, wireless communications and wide area networking.

Felix Meyer HB9ABX

HAM homebrewing: antennas, filters, cables, digital communications.

FEMA

Federal Emergency Management Agency.

FM-Transmitter

The leading provider for radio transmission & studio equipment worldwide, including electronics kits.

G7KPF UK Quick Links

UK Amateur Radio Quick Links.

GeoTool
714-403-2026  / Newport Beach, CA

Rick Curtis, WA6JKH. Heavy duty pickup truck antenna mounts were developed to provide Amateur, CB, and commercial radio operators a very strong, easily installed antenna mount for several types of antennas. Eliminates the need to drill holes in the exterior body of your truck, and will maintain a mounting location optimal for long distance communications.

Glen Martin Engineering, Inc

Your online home for towers & communications support structures.

Google Directory

Shopping Consumer Electronics Communications Wireless Radios Amateur Radios.

Grove Enterprises

Receivers, antennas & accessories, test equipment, scanners, monitoring software, shortwave books & CDs, WiNRADiO.

Hal Communications Corp

Building amateur products and developing communications equipment for over a quarter of a century.

Ham CAP Propagation Software

HF propagation prediction tool for Amateur Radio by Alex Shovkoplyas, VE3NEA

Ham CAP provides a COM/OLE Automation interface that 3-rd party programs can use to start Ham CAP, to set prediction parameters, and to run predictions. In a typical application integrated with Ham CAP the user will right-click on a call sign, and Ham CAP will pop up and display the point-to-point propagation chart. Incredible graphics!

Ham Radio Classifieds

Free from QTH.COM.

Hammond Manufacturing
716-651-0086 / Cheektowaga, NY

Electrical enclosures, racks, small enclosures, electronic transformers, outlet strips.

Hammond Museum of Radio

The new Museum is now home to hundreds of receivers and transmitters dating from the spark era up to and including National's first solid state HRO500. Over the years the Museum has evolved to become one of North America's premiere wireless museums. Fred Hammond VE3HC

HamRad

Amateur Radio Resource - links, events, organizations, manufacturers, dealers, and more.

Ham Radio Outlet

Supplier of Ham Radio equipment.

Ham Lookup
540-270-7878 / Bealeton, VA

Amateur Radio call sign search callbook CD-ROM. Modern, easy-to-use software for both Windows and Linux. Free updates, free upgrades.

HamRadioManuals
516-671-1181 / Glen Cove, NY

Supplying vintage to modern HAM radio and related manuals.

Hamtronics

Commercial & amateur VHF & UHF radio equipment.

Hamware

Manufacturer of remote controlled RF antenna tuners. WW delivery.

Handi-hams

Amateur Radio & Technology for people with disabilities.

Heathkit Educational Systems

Develops and distributes technical education curriculum, courseware, and hardware to assist academic institutions, corporations, training centers, and 'self-study' users worldwide.

Heil Sound

Microphones, headsets, audio systems & accessories. The Heil PROLINE division brings some new and exciting Heil innovations to the commercial broadcast and recording studio.

Henry Radio

RF Power Amplifiers & Exciters Communications equipment.

Heston Supply
360-425-8730 / Longview, WA

Amateur radio supply; coax, connectors and more. The little Guy.

HF-Fax
Hannover, Germany

Marius Rensen presents his site that specializes in worldwide radio facsimile & SSTV. "The reception of Radio fax, Wefax, Press fax, Photo fax and amateur SSTV radio stations is a child’s play now. Inexpensive software such as WXSat and JVComm32 for sound cards, or JVFAX with a simple converter, connect to a (SSB) radio receiver allows you to receive facsimile services and SSTV from stations all over the world."

How Ham Radio Works

Howstuffworks.com - Amateur radio is a worldwide group of people who communicate with each other over a wide frequency spectrum using many different types of wireless transmitting modes.

HotPress
800-862-1221 / Sumner, WA

Caters to Ham Radio hobbyists for hats, T-shirts, coats, mouse pads & more. Customizable with your name and call sign. Also POW-MIA items.

Icom

Makes amateur radio products for use in long & short-range communications, also makes advanced technology products allowing worldwide communication relayed through space satellites owned by amateur organizations & manufactures a series of short-wave receivers used for hobby, industrial and government applications.

Idiom Press

CW Keyers & kits, rotors, books, filters.

International Crystal Mfg Co

Manufactures an extensive line of quartz crystals, oscillators, filters, and TCXOs/VCTCXOs.

International Radio

Supplier of custom designed, high performance quartz crystal filters for communications receivers and transceivers... and MORE!

International Space Station Reference

NASA Ham Radio information.

International Telecommunication Union

An international organization within the United Nations System where governments and the private sector coordinate global telecom networks and services.

International Visual Communications Association

SSTV information & links.

Intuitive Circuits, LLC

Develops, manufactures, & sells video on-screen display, DTMF, GPS logging, miscellaneous OEM and standalone products for government agencies, businesses, and hobbyists.

IPS Radio & Space Services

The Australian Space Weather Agency.

Jan Crystals

Crystals & oscillators.

Jim's Crosley Antique Radio Page

Very good collection of Crosley radio photos and a selection of models for sale. A unique collection of vacuum tube box art.

Jim Tonne (WB6BLD)

Software, App Notes. A technically-oriented site for engineers, technicians and radio amateurs.

JWM Engineering

Manufacture phased-locked oscillators for Amateur Radio equipment.

K1SIX (ex-WA1OUB)

Amateur Radio Web Page.

K9IU Amateur Radio Club

Indiana University Amateur Radio Club - membership includes students, faculty and staff of Indiana University, as well as other interested local hams.

KK7TV Communications

Amateur Radio Repair Center - Custom Sound and Video.

Kangaroo Tabor Software

HF Communications Analysis and Prediction Tools for Amateur Radio operators and communications professionals.

Kantronics

Wireless data controllers.

kc2sho.com

Electronic repairs -  Home, auto, DJ and professional audio equipment, transmitters, transposers, repeaters, amplifiers, power supplies, broadcast, amateur (ham) and 2 way communication equipment, computers, servers, network equipment, game systems; test and tune passive RF devices such as filters, duplexers and directional couplers.

K-Com

Manufactures products for attenuation (suppression) of Radio Frequency Interference (RFI) to Telephone Equipment.

Kenwood Communications Corp

High quality consumer electronics, test equipment, communications equipment, amateur radio, business radio, and land/mobile radio products.

KVG

Manufacturer of quartz crystals and crystal components.

KW Amateur Radio Club Inc

Kitchener-Waterloo Amateur Radio Club.

Longwave Club of America

Promotes both DXing & experimenting on frequencies below 550 kHz & activity on the 1750 meter band.

Mai/Prime Parts

Electronic equipment, subsystems, components and materials.

Manual Man

Specializes in vintage manuals for amateur, audio, and radio-related equipment.

Martronics
805-239-1932 / Paso Robles, CA

7-1300MHz, 13-1300MHz, 30-1300MHz discone antennas, PCB design, RF cable assemblies, BALUNS, UNUNS, mobile hitch antenna mounts, systems, and assembly services.

MDS
Moultrie, GA

Microsystems Design Services president and CEO Glen Bankston (K4KV) announces our RC-1 Rotor Control. It is designed to save the amateur radio operator money, and give computer control of many rotor systems. Our new Digital Control Box will work as a direct replacement for the Yaesu Series G-450A, G-800, G-800DXA, G-800SA, G-1000DXA, G2800DXA control box, with digital display and computer control. We also have a model of the RC-1 Digital Control for the Ham II, IV, T2X, Yaesu, CDE, HyGain, Wilson, and many other common antenna rotators

Metal & Cable Corp, Inc

Power cable, interlocked armor, building wire, electronic cables, thermocouple wire, bare wire, UD cable, Bus bar & tube, Special constructions and custom cables.

MFJEnterprises.Com

Extensive supply of amateur radio equipment & accessories.

Milestone Technologies

Telegraph keys, bugs, paddles, and related telegraphic equipment, electronic keyers, keyboards, and keyer-paddles, electronic kits, AMECO keys, oscillators, filters, pre-amps, code training, hand tools, soldering equipment, test equipment, Morse code training, and logging software, electronic parts and components.

Mirage Communications Equipment

Amplifiers, docking booster adapter plates, HT docking boosters, remote control, repeaters, SWR/Watt meters.

Modern Radio Laboratories

Exclusive Source, printing and publishing of all MRL® Handbooks and Literature by Paul Nelson and Elmer G. Osterhoudt. Tested Instructions and Plans.

Mods.dk

Tips, tricks, and modifications of HAM rigs, HAM modems, etc; modifications of many types of HAM radios, microphones, power supplies, modems etc. You can find how to modify a radio to receive and transmit out of range, you can find how to modify a radio to use high speed packet modems, and how to modify the radio/modem to get better performance.

Morcom International

The latest in wireless communications & advanced weather systems for commercial, security, government, & amateur use. Communications systems design, airport ground-to-air communications, weather information systems design, IT hardware support & management, repair & programming of radio transceivers, hydro-meteorological system design, airport weather observation systems (AWOS), export/import consulting services.

Morse Code Ring Tone

Create a free MIDI file for any Morse Code message.

Morse Code Tutorial

A neat online tutorial and interactive code test - by 1728 Software Systems.

Morse Telegraph Club

International non-profit organization dedicated to the perpetuation of the knowledge and traditions of telegraphy and American Morse Code.

Mt. Airy VHF Radio Club

The Mt. Airy VHF Radio Club is dedicated to serving the VHF / UHF/ Microwave Amateur Radio community as well as enhancing the state of the art for 50 MHz and above operation.

NØHR.com

Software tools for ham radio (propagation, PDA apps), a DXpedition map, links and articles.

National Association for Amateur Radio

ARRL - Exams, clubs, hamfests, addresses, operating activities, licensing, news.

Nat Radio Co
Point Pleasant, NJ

Software for amateur radio and engineering.

Navy-Marine Corps MARS

U.S. Navy Military Affiliate Radio System, proudly serving the U.S. Navy, U.S. Marines and U.S. Coast Guard.

Nevada Radio in the UK

Suppliers of amateur radio, scanners, pmr, digital and shortwave equipment and accessories.

New Sensor Corp

Products for vacuum tube enthusiasts, guitar players, and repair technicians. We have also added new lines of capacitors, speakers, technician tools (including test equipment and soldering stations), Hammond transformers and enclosures, Duracell batteries, guitar amplifiers, and much more...

Northern Lights Software

Satellite Tracking Software -real time tracking of an unlimited number of satellites.

Nuts & Volts Magazine

Published monthly for the hands-on electronics hobbyist. Our magazine covers the fields of analog and digital circuit projects, relevant and emerging technologies, fundamentals, and thought inspiring features on lasers, data security, supercomputing, near space experiments, micro controllers and more.

Oak Hills Research

Source for quality transceiver kits and accessories.

Ocean State Electronics

Components, kits, test equipment, & hard to find Items. Hobbyist-School-Industrial.

Ole Virginia Hams

"The Ole Virginia Hams is a non-profit Amateur Radio club organized for the educational & scientific study of electronics & communication, and to provide amateur radio communication services for the public."

Old Tech-Books & Things

Specializing in books and objects relating to early technology - radio, television, wireless, vintage synths, medical electricity, computation & more!

PacComm

Wireless radio systems, equipment and accessories, including Terminal Node Controllers (TNCs).

Pad2Pad.com
201-447-9120 / Midland Park, NJ

Low-cost, rapid turn-around PCB fabrication service. Free downloadable layout software. Live, online support available.

Palomar Engineers

Manufacturer of amateur radio equipment, also sells ferrite and iron powder cores for RFI suppression and prototypes.

P.C. Electronics

Amateur radio equipment, Ham radio equipment, amateur television equipment.

Peter W. Dahl Co Inc

Manufactures a wide variety of transformers and reactors for amateur radio and commercial radio & TV applications.

Philco Repair Bench

Dedicated to antique Philco radios from the 1928 through 1947 time period.

PK's Loop Antennas
+61 412 302 939 / Croydon, Victoria Australia

Manufacturers of RF converters, filters, amplifiers and loop antennas for longwave, mediumwave,   and shortwave radio reception.

Practical Wireless

Britain's best selling amateur radio magazine.

Project OSCAR

Project OSCAR started in 1960 and was responsible for the construction of the first Amateur Radio Satellite OSCAR-1, that was successfully launched from Vandenberg AFB in California. OSCAR-1 orbited the earth for 22 days, transmitting the "HI" greeting you see in Morse Code above. Our mission is "To initiate and support activities that promote the Satellite Amateur Radio Hobby". Our primary goal is to reach out and provide logistical support, training and in some cases equipment to amateur radio associations, schools and the public at large.

PSK31

Peter G3PLX's implementation reference software.

QRP Amateur Radio Club International

Members are from countries as far apart as USA, Russia, UK, Japan, Holland, Australia and many, many more; a truly international organisation featuring news, links, technical information, and more.

QRZ

Amateur radio shareware and information.

QTH.com

Low cost web site hosting and classified swap ads for ham radio, amateur radio and others.

Quantics

W9GR Digital Signal Processors.

Radian
866-4RADIAN / Canada

Towers and accessories.

Radio & Electronics School

This place has an incredible collection of useful items that includes video and audio lessons, calculators and articles. Founded in 1998 by Ron Bertrand VK2DQ/4. The Radio and Electronics School is a non profit organisation run by a dedicated group of volunteers from the states of Australia.

Radio Adventures

A small engineering company specializing in the design and manufacturing of ham radio equipment components, kits, & accessories for both the amateur radio and commercial communications markets.

Radio Amateur Satellite Corp (AMSAT)

North American branch of the international amateur radio satellite community.

Radio Bookstore & Radioware

Antennas, antenna wire/rope, coax cable, coax connectors, rilters - RFI/TVI grounding parts, KD9SV preamps, lightning protection, wire & cable.

Radio Dr.
804-437-1705 / Richmond, VA

Professional radio repairs on old & new CB's, Ham radios, and marine radios. Low rates, free estimates.

Radio-Electronics.Com

Information, tutorials and books on all aspects of radio, cellular telecom and electronics from the historical aspects to today's latest technology.

RadioReference.com

Radio communications reference website, featuring a complete frequency database, trunked radio system information, FCC License assignments and callsign maps, 10-Code Lists, agency maps, files, downloads, links, and detailed agency information for most public safety, military, and local government communications.

Radio Society of Great Britain

UK's internationally recognised national society for all radio amateurs.

Radio Shack

Consumer electronics specialty retailer of wireless communications, electronic parts, batteries and accessories as well as other digital technology products and services.

RadioUser

Information and articles on civilian & military airbands, scanning, reviews, maritime matters, news, trading post.

Radioworld

Features a wide selection of amateur ham radio equipment, GPS equipment, aviation communications equipment, marine radios, shortwave radios and wide band radio scanners, and CB radios and accessories.

R & L Electronics

Carries amateur radio, Citizen's Band Radio, commercial radio, general electronic items, marine radio, and short wave radios.

Ramsey Electronics
716-924-4560 / Victor, NY

Amateur radio gear, hobby kits, test equipment, tools, enclosures, RF signal generator modules.

Raymond Sarrio Co

Amateur radio products & news.

Recycled Radio

Active buyers of amateur radio & shortwave equipment - Estate liquidations are our Specialty.

RF Parts

Large inventory for servicing and manufacturing amateur, commercial & broadcast communications equipment including cable, connectors & adapters Heliax coax cable, ARRL & technical books, service & owners manuals, RF modules, transistors, heatsinks, high voltage rectifiers, wattmeters & elements, electronic & coaxial dynamics, coax relays, transmitting tubes, high voltage rectifiers, electron tubes, tube sockets, receiving tubes, and much more.

Robert F. Heytow Memorial Radio Club - K9YA

Publisher of the K9YA Telegraph — a FREE general interest ham radio newsletter.

Rohn Industries (now Radian)

Towers, poles, site accessories, hardware and services.

S & S Engineering

Precisely QRP - transceivers, frequency counters.

San Bernardino Microwave Society
Corona, CA

A non-profit technical organization dedicated to the advancement of communications above 1000 MC.

Seaworthy Software
513-851-6834 / Cincinnati, OH

The CountyLogMobile program is a specialty logging program designed for mobile amateur radio operators. It has been designed to allow quick entry of important information regarding QSOs. The data from this program may be imported into your general logging software. Exports data in the ADIF (Amateur Data Interchange Format) and CSV.

SHF Microwave Parts Co

Microwave & RF parts for data links, television, voice & telemetry for Hams, experimenters, & laboratories.

Sky & Telescope

Astronomy magazine - also publishes an annual magazine called SkyWatch as well as books, star atlases, posters, prints, globes, and other fine astronomy products.

Skywave Technologies
781-862-6742 / Lexington MA

Software company producing tools for predicting radio propagation. IONSOUND is a very sophisticated ionospheric propagation predictions program for frequencies between 1.8 MHz and 30 MHz. Geographical regions are chosen from the TX and RX location menus.

Software Systems Consulting

Offers a broad spectrum of custom software development services in a wide variety of fields including radio communications, process control, imaging, astronomy, data acquisition & analysis.

Solder-It Co

Manufactures & distributes specialty low temperature solder pastes, butane powered torches, tools and a few other amazing products.

SuitSat Transmissions

A collection of status reports and audio recordings from Amateur Radio Operators around the world.

Surplus Sales of Nebraska

New & surplus electronic parts.

Surplus Traders

Computer & electronic surplus supply.

TAPR (Tucson Amateur Packet Radio)

Club website.

Telex Communications, Inc

High performance professional audio and communications equipment, hardwired & wireless inter-communications products including microphones, amplifiers and loudspeakers.

Ten-Tec, Inc

Amateur & shortwave radio, commercial & government radio, cabinets & enclosures tool & die services.

TestParts Sales Company
T: (775) 535-7808 F: (775) 320-6040 / Evans, GA

Coax adapters, coax cable assemblies, oscilloscope probes, RF switches & relays, RF vacuum relays & switches, RF microwave parts, test equipment, test leads, tools, Wattmeters elements & loads.

TexasTowers.com

Online Ham Radio store - aluminum tubing, amplifiers, books, coax & cable, filters, keys, paddles, remote switches, towers, more.

The DXZone.com

Amateur Radio internet guide.

The Pouch

Amateur HT radio carrying case - Ham Handy Talkie Cases.

Timewave Technology, Inc

Communications & signal processing products for amateur radio, military, marine, commercial, government, and industrial applications.

TX RX Systems, Inc

Designs and manufactures transmitter and receiver multicoupler systems, duplexers, resonant cavity filters, signal boosters, tower-mounted preamplifiers, and many other specialized RF system products.

Unified Microsystems

Products for radio amateurs who want to get the most performance out of their stations while contesting, DXing and other competitive activities.

Universal Radio

Amateur and shortwave radio equipment, antennas and accessories, scanners, CB, FRS, GPS and weather instruments,  also offers an excellent selection of radio related books.

US Tower Corporation

Manufacturer of the world's finest, state-of-the-art, steel telescoping towers.

Very Early Yaesu Musen Co

Amateur Radio Equipment in Australia.

Vintage Radio & Test Equipment site

EB5AGV / EC5AAU personal amateur radio website.

W5YI

Assists applicants in obtaining the various FCC-issued Amateur and Commercial Radio Operator licenses.

W6ELProp

Primary W6ELProp software distribution site.

W7FG

Vintage Manuals.

WA3KEY

Virtual Collins Radio Museum.

Wavenode

Amateur Radio Station Monitoring System with computer interface which now includes Audio Announcing for RF power, SWR, and DC monitoring using remote sensors for local or remote operations. Personalized graphic display.

WB6VUB

"Amateur Radio Web Page" with extensive website links. All software now listed here on the separate Tonne Software website - very nice!

WeatherShack.com
888-992-2270 / Copper Hill, VA

Weather Stations for amateur weather enthusiasts, pilots, and ham radio operators. Featuring Davis Instruments, La Crosse Technology, and Nielsen-Kellerman, we carry a wide variety of cabled and wireless weather stations, wireless rain gauges, weather alert radios, and radio controlled clocks.

Especially useful to those who visit our site is our Weather Station Education Center, a non-commercial and comprehensive guide to weather measurement equipment; how they work, what applications they're used in, and how they should be set up

West Coast Mall - Electronics & Accessories

New CB radio, FRS/GMRS radio, marine electronics, scanners, antennas, radar detectors, and all their accessories. Same day shipping in most cases.

Westgate Laboratories

RF transistors, resistors, Teflon wire, diodes, solder, fans, silver mica capacitors, vacuum and ceramic tubes and much much more for CB, Amateur and Antique Radios.

Wholesale Electronics Inc
800-351-2233 / Mitchell, SD

Antennas, audio equipment, batteries, books, cabinets, racks, furniture, capacitors, chemicals, communications, computer, fans, fuses, Hitachi, lamps, power supplies, RCA, relays, solenoids, resistors, semiconductors, switches, tools, towers, test equipment, transformers, video, wire, cable.

Wilderness Radio

Kits aimed specifically at the outdoor QRP enthusiast.

Winegard

Manufacturer of quality television reception products, manufacturing technology and sales of digital satellite antennas.

The Wireman Inc

Products for amateur and professional radio.

WorldRadio

Club, contest & Hamfest listings, books, references, software, videos, antennas, 24hour watches.

Www.Ham.dmz.ro

Amateur radio resources, news, and products.

Wyke Regis Amateur Radio Training Centre

We meet and help others without asking for anything in return. Courses do cost money, so we only charge what it costs us and don't ask silly prices. The Training Center is located in Wyke Regis, between Weymouth and Portland in Dorset UK and is open to anyone who is interested in the hobby of amateur radio. For those in the area, it is the place to come to learn, meet other radio amateurs and attend a course if you want to.

Wyman Research, Inc

Manufactures television equipment, also is a dealer for Tasco and Kenwood slow scan systems.

YAESU

HF transceivers/amplifiers, receivers, rotators, VHF/UHF handhelds, mobile transceivers, WIRES™ Internet Linking products.

Yahoo!

News and Media Radio Amateur and Ham Radio.