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This is a combination center and top loaded multiband antenna by Mark D. Lowell, N1LO PDF File

This homebrew legal-limit antenna tuner is based on the famous "Ultimate Transmatch" introduced by the late Lew McCoy, W1ICP. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24).

Inductance and Capacitance meter using``Frequency Shifted Oscillator

A portable antenna for mode B and J satellites

Multitasking data analyzer demodulator and decoder for Windows.

DIY Basic Electronic Theory, Basic Antenna Theory with Antennas built from common materials. What does SWR really mean. Baluns from transmission line.

The Yaesu VL-1000 Quadra HF Linear amplifier

This sketch will read RF power and SWR from any SWR bridge, designed to work on VHF UHF bands

2 m. Band VHF Collinear with 2 Dipoles by sv1bsx

A program to control a repeater using an old computer and printer or serial port.

Long range Wi-Fi antennas you can build. Helicals, parabolics, and biquads discussed. How to add external antennas to WUSB54GC and F5D7050 usb wireless adapters for long range connections.

2 element Quand antenna for 10 - 12 - 15 -17 - 20 meters band

How to build an Hexagonal antenna in 3 hours

An informative page about delta loop antennas

Modified version of the Telerana antenna which was orginially featured in the July 1979 issue of QST. The array is suspended within a framework made of fiberglass poles emanating from a central hub with the ends tied together with light weight rope around the perimeter. 10-15-20-30-40 meter band coverage

Article by Ed WE6W on a double bazooka antenna

40 meters band Delta loop antenna plan that is vertically polarised

ZZ Wave Net is a 40 & 80 meter full wave loop designed to fit on a city lot. ZZ Antenna is a folded dipole bent into an inverted V loop

What is the best balcony antenna? what antenna would you recommend for use on typical hotel balcony? Read some answers here

Notes on making the W2DU choke balun by placing several ferrite sleeves around a coaxial cable.

Free german Open Source HAM Logging Program unter the terms of the GNU General Public License. CLLOG runs under MS-DOS (Windows DOS-Window under 3.x,9x,NT,ME,2000) and LINUX. All Functions for Logbook.

Build a PSK-31 PC interface for the yaesu FT-817

Starting from an original project for a 2 element quad antenna for six meter band, ve7ca presents the dimensions for a 3 element version.

A very quick and easy way to get on the air is to build a "Michigan Mighty Mite" CW transmitter for 160, 80, 40 or 30 meters. It can't get simpler than this. It has very few parts, costs almost nothing, and it works! Cost estimate $10 by VE6WTF

This semi-homebrew QRP (low power) CW transceiver is based on the ARK-40 transceiver kit, by S&S Engineering. With its built-in CW keyer and 5 watts of power, the basic ARK-40 transceiver is an outstanding 40 meter CW performer

WSJT-X, a creation of K1JT, offers specialized digital protocols meticulously optimized for challenging propagation paths such as EME (moonbounce), meteor scatter, and ionospheric scatter. This software excels at VHF/UHF frequencies, and also provides robust performance for LF, MF, and HF DXing, enabling contacts far below the audible threshold. The program decodes signals from ionized meteor trails and steady signals more than 10 dB below the audible threshold, a testament to its advanced digital signal processing. It integrates nearly all popular features from its predecessors, WSJT and WSPR, while adding comprehensive rig control and numerous other enhancements for the serious weak signal operator. Available for Windows, Linux, and Mac OS X, WSJT-X is an open-source project, allowing hams worldwide to download the latest versions and engage in cutting-edge weak signal communication.

The resource provides detailed information about a five-band indoor magnetic loop antenna designed for amateur radio operators. This antenna is capable of operating on the 20, 17, 15, 12, and 10 meter bands, making it a versatile choice for various HF communications. Constructed from a single 3-meter length of 22 mm copper tube, the design emphasizes compactness and efficiency, which is particularly beneficial for operators with limited space. The page includes insights into the construction process, tuning, and operational tips, catering to both novice and experienced users. In addition to the technical specifications, the resource also discusses the advantages of using a magnetic loop antenna indoors, such as reduced interference and improved performance in urban environments. It serves as a practical guide for those interested in building their own antenna, offering a straightforward approach to antenna design and construction. Overall, this resource is a valuable addition to the toolkit of amateur radio enthusiasts looking to enhance their station with an effective indoor antenna solution.

This antenna modification is for the IEEE 802.11b networking protocol that operates at 2.4 GHz. It can be scaled easily to the 5 GHz frequency used by IEEE 802.11a by simply scaling the dimensions on the feed can and the excitation antenna to 2.4/5 = 48% of the dimensions shown above.

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.

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

N3ox 6 meter moxon rectangle, pictures and assembly notes

Based on Motorola MRF454, schematics and component list

DJ9BV yagi antenna for 2 meters band

Quality QRP, Antenna Tuner, and Ladderline Insulator Products

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

Modification schematics and manuals for TH-F6A

Meter and Low Power Tune for FT-857D

Continuos coverage HF Transceiver by I6WJB & I6YPK

Based on a design by JM1SZY for 50 MHz that he developed using YO

144 MHz Kilowatt Amplifier with a Gu74b.

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

Duplexers for dual band radio are usually high pass filter and low pass filter combined in the same box. This circuit is a design within a cost of US$10.

Simplified U.S. frequency allocations table by K8ZT

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

This resource provides a historical listing of **unlicensed amateur radio beacons** active in the United States as of December 1993, specifically detailing both **LOWFER** (Low Frequency Experimental Radio) and **MEDFER** (Medium Frequency Experimental Radio) operations. The data includes beacon frequencies in kilocycles (Kc), identification codes, state locations, and the callsigns or names of the beacon operators. Frequencies range from 166.667 Kc for LOWFER to 1706.0 Kc for MEDFER, illustrating the spectrum utilized by these experimental stations. The information was originally compiled by Mark Burkart and relayed to the rec.radio.shortwave newsgroup by Rick Robinson, KF4AR. The list serves as a snapshot of experimental beacon activity from the early 1990s, offering insight into the types of operations and the individuals involved in unlicensed, low-power transmissions. It highlights specific beacon IDs like "ABC SC" on 510.5 Kc and "GK HI" on 1620 Kc, alongside operator details such as Todd Roberts (WD4NGG) and Herb Vanderbeek (WY6G). While not a current operational guide, it is a valuable historical document for those interested in the evolution of LF/MF experimental radio and the early days of internet-based amateur radio information sharing.

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

The N2CKH travel special 300 Ohm ladder line convertable antenna

This FET preamplifier has been around for almost 25 years. It is extremely reliable and can handle several watts directly into either the input or the output without failure.

Mars Mod for Yaesu FT-450 extending frequency range: 1.8-30 MHz