websdr app

W5GI Mystery Antenna  ^{updated  pop} - W5GI Mystery Antenna is a multi-band wire antenna that performs exceptionally well even though it confounds antenna modeling software. This antenna covers 80 to 6 meters with low feed point impedance and will work with most radios, with or without an antenna tuner. It is approximately 100 feet long, can handle the legal limit, and is easy and inexpensive to build. It�s similar to a G5RV but a much better performer especially on 20 meters.

Balun Information - Baluns for HF application resource page

To Trap or Not to Trap - An interesting article on traps, pros and cons of trapping by W4RNL

Quagi Designer - Quagi antenna design, this little windows application let you calculate dimensions of elements and spacing of a quagi antenna. Freeware by VE3SQB

Optimizing Inductors - While intended mainly for antenna loading coils, this article also applies to other resonant systems, such as amplifier tank circuits.

Installation of a Utility Pole - 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.

A *balanced* balanced antenna tuner  ^pop - The published version of this article appeared in the February 1990 issue of QST Magazine

2.4 Ghz double quad antenna  ^pop - An easy to build, compact antenna for wireless lan applications that offers a reasonable amount gain.

Pringles Yagi Antenna - Design and build a Pringles Yagi antenna for 2.4Ghz.

ARIDX by UA1AAF - At the moment the most used program is UA1AAF. It is an excellent program written by Boris, UA1AAF, to handle ARI International DX Contest. It can simulate K1EA or N6TR workings; it will be possible to connect the RTX to the computer using a standard interface in such a way as to transmit directly in CW from the keyboard; most of the controls are like K1EA's CT and N6TR's TR ; on line help provides almost all the information necessary for using the program. Is possible to insert QSO after the contest. An appropriate utility in included for conversion in ADIF format. The program is very small and therefore works without any problems on any IBM compatible computer with DOS 3.3 and over or Windows 95/98.

Foyle & District ARC - MN0AKU Foyle & District Amateur Radio Club. Based in Northern Ireland , approximately 7km South of Londonderry City

Elkins Training - FCC Training - Ekins offers an fc preparatory training class for grol and for all commercial licenses, permits and endorsements, including gmdss, stcw and the 70-hour coast-guard approved course.

WB9KMO Ham Radio Video Library - The Ham Radio Video Library is a continuous loop of several ham radio-related video clips. The current clips are Monroe School ISS Contact (15 minutes), DARPA Grand Challenge - Ghostrider (5 minutes), DARPA Grand Challenge - Stanley Wins! (5 minutes), JOTA - Jamboree On The Air (15 minutes) and SBARC Tesla Presentation (50 minutes) - times are approximate

Sunlight Energy Systems - Sunlight Energy Systems provides charge solar controllers and power supply products for amateur radio applications and solar panels usage

SSB Electronic USA - manufactures and distributes HF, VHF, UHF and SHF equipment covering 10MHz. - 47.0GHz. Our products include: Wireless LAN / WAN Bidirectional Linear Amplifiers, Low Noise Preamplifiers - LNA's, RF Linear Amplifiers, Relays, Transverter Systems, Frequency Translation Systems, Downconverters, Antennas, Parabolic Dishes, Coaxial Cable, Relays, Antenna Switches, Microwave Test equipment, PC controlled Receivers, Microwave Linear Amplifiers including models for Telemetry, Wireless, and CDMA applications.

The Mast Company - Telescopic fiberglass poles, tubes, special products for Amateur Radio stations suitable for ARES / RACES and other public service applications

Tarheel Antennas - Our motorized antennas and stainless steel mounts are designed with the most avid HAM radio operator in mind, as well as commercial applications. They are made with the best materials and top of the line workmanship. Antenna mounts

A Little Mobile Information - Alan Applegate (K0BG) article on mobile oprtations

Yagi Modeler Applet - This java applet/application implements a simple yagi modeling code. The initial input is a really trivial 2 elmenent yagi.

IP-Sound  ^pop - IP-Sound is a Free application for audio exchange client to client over a TCP/IPv4 network (Lan/Internet). The main purpose for the existence of IP-Sound is to provide low quality audio 8-16kHz, with low latency for use together with remote control software for "ham" radio amateur equipment. IP-Sound is developed by SM5VXC.

FFT Explorer - A free (GPL) Linux (Xwindows GUI-based) utility that performs spectral analysis on real-time data from a sound card or other source, and can analyze the spectra of various sound file types. It can also accept data from many kinds of applications in plain-text form by way of the "named pipe" feature of Linux

The Approx. Perfect Amplifier manuscript - Discussion of some design features that would be present in a perfect, or near-perfect, amplifier.

Car and Deep Cycle Battery FAQs - Car and deep cycle battery answers to Frequently Asked Questions (FAQs), tips, manufacturer's information, references and hyperlinks are contained on this consumer oriented Web site about car, motorcycle, power sports, truck, boat, marine, recreational vehicle, solar, and other starting and deep cycle applications.

Simple Reverse Polarity Protection - This simple modification is applicable to pretty much any 12 volt operated, positive earth equipment. by Chris Cox, N0UK, G4JEC

RFI - Intermodulation - Getting squeaks and squawks from your H-T? Are pagers crunching your mobile rig's front end? Here's how intermod happens--and how to fight back!