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A simple home made desk microphone project that can be fitted into a small plastic project box

RG-174/U article on usage by AA5TB

GPSTime is a small freeware applet that corrects your PC clock using GPS. GPSTime reads the serial data coming out of your GPS receiver and decodes the $GPRMC messages to determine the precise UTC time. Works on Windows Vista/7/8/10 with PC with serial ports.

Oakcallsigns.com specializes in custom-crafted oak call signs, presenting various designs for amateur radio shacks. The resource showcases different styles, including standard call sign plaques and options featuring iconic ham radio silhouettes like the _D-104_ microphone. Each item is described with pricing, ranging from $15.00 to **$25.00**, and includes details on shipping and seller reputation. The platform highlights the craftsmanship involved, emphasizing personalized scroll-saw work on each oak piece. It details the seller's positive feedback rating of **99.4%** from over 10,000 transactions, indicating a reliable source for these unique accessories. The site also provides information on the number of units sold for specific designs, such as 2,338 for the standard call sign gift and 554 for the smaller personalized version. This commercial offering focuses on decorative and personalized items for the ham radio enthusiast, distinct from operational equipment. It serves as a direct retail channel for custom shack adornments.

A small dipole antenna installed inside a balcony. This linear loaded short dipole antenna has been designed at first for the 21 MHz and then adapted for the 20 meters band.

NFDXA is a small group of amateurs located in and around the Jacksonville area in Northeast Florida

This is about Small Antenna types and their properties which can help choosing proper antenna for high-frequency wireless communications as: two-way radio, microwave short links, repeaters, radio beacons or wireless telemetry

SDRplay limited is a UK company and consists of a small group of engineers with strong connections to the UK Wireless semiconductor industry. SDRplay announced its first product, the RSP1 in August 2014

A quick and dirty 1MHz transmitter to send old music into old radios

Who needs a GaAsFET? Tuning, constructions and Packaging by Paul Wade

This project describes the construction of a real CW QRP keyer with a small microcontrolle

The 80 metre fox-or/test transmitter is a small low power transmitter which is designed to be used as an alignment aid for running up 80 metre foxhunt or ARDF receivers. It is also usable as a micro transmitter for fox-or-ing events.

A 109 pages presentation in PDF File by Jim Brown K9YC on techniques in operatint the top band from a small lot.

The A QRP Club is a small group of Amateur Radio enthusiasts who enjoy building, operating and (mostly) talking about Low Power radio communications, equipment and systems.

A small collection of bash scripts for pulling QTH info, grid square info, propagation charts, and monitoring prop logger postings.

The KnightLites QRP Association is a world wide fellowship of low power (QRP) amateur radio communications enthusiasts founded in 1996, and is coordinated through the efforts of a small group of radio amateurs located in the Research Triangle region of North Carolina in the United States.

The _Sci.Electronics FAQ: Repair: RFI/EMI Info_ document, authored by Daniel 9V1ZV, provides a detailed analysis of computer-generated RFI/EMI, focusing on its impact on radio reception. It identifies common RFI sources such as CPU clock rates (e.g., 4.77 MHz to 80 MHz), video card oscillators (e.g., 14.316 MHz), and even keyboard microprocessors, all of which generate square-wave harmonics across HF and L-VHF regions. The resource outlines a systematic procedure for pinpointing RFI origins, including disconnecting peripherals and using a portable AM/SW receiver with a ferrite rod antenna to localize strong interference sources. The document categorizes RFI mitigation into shielding, filtering, and design problems, offering practical solutions for each. It recommends applying conductive sprays like _EMI-LAC_ or _EMV-LACK_ to plastic casings of radios, monitors, and CPUs to create effective Faraday cages, emphasizing proper grounding and avoiding short circuits. For filtering, the guide suggests using line filters, ferrite beads, and toroids on power and data lines, and small value capacitors (e.g., 0.01 uF for serial/parallel, 100 pF for video) to shunt RFI to ground. It also discusses the use of bandpass, high-pass, low-pass, and notch filters on the receiver front-end or antenna feed to combat specific in-band noise.

We are a small club dedicated to help the community any way we can.

The ZL1BPU Rotator Controller has been designed as an add-on unit for the popular Kenpro KR-400 and Yaesu G-400 rotators. The controller consists of a small circuit board which fits inside the rotator control box

A manufacturer of standby and prime power generator sets for industrial, telecommunication, commercial, small business, mobile and residential applications.

A Simple Delta Loop Antenna for Smaller Vessels

Moxon is a rectangle shaped directional antenna, originally designed by Les Moxon G6XN. There are couple of advantages of using this antenna. It is small in size, Easy to mast, Balanced to 50 Ohms, Near 1:1 SWR, Excellent Front to Back (F/B) ratio, Large bandwidth

The adventures of a small Contest Group

A small (FT-817) I.F. radio driving a 100w transverter with a 1db nf front end.

Wideband receiving phased arrays with small electric or magnetic active wideband elements are discussed in details. Practical results and examples are given.

Encouragement for Little Pistols, article originally written for and published in SKIP the monthly newsletter of the Fresno Amateur Radio Club

Notes on the Troubleshooting and Repair of Small Switchmode Power Supplies

Six meters is a great band for home built Yagis. The elements are reasonably small, but not so small that building tolerances are critical. With careful construction and detailed instructions, it is certainly feasible to build no-tune Yagis up to 432 MHz.

The Hexbeam is a great little antenna! It should be high on your list of options if you want a design that can be multi-banded, exhibits useful gain and directivity, is very lightweight, has a small turning radius, and which lends itself readily to Do It Yourself construction.

An homemade antenna tuner project that should be small, easy to build and cheap. This automatic antenna tuner can work as locale or as remote. The tuner has EEPROM memory for store settings for faster tunning and four interfaces

Since the beginning when a small group of Hams met to form a club in the southwest corner of Dallas County, it has always been known as SWDCARC or by it's full name, Southwest Dallas County Amateur Radio Club.

First started in the early 80's by a small group of Hams that resided in Cle Elum, Washington.

Home of the HPS-1a Gamma Hybrid Communications Power Supply. The HPS-1a is a very small, light weight , power supply that is most useful for hams who take their transceivers when traveling.

Constructing a dip oscillator provides radio amateurs with a fundamental piece of test equipment for resonant circuit analysis. This particular design, adapted by VK3YE from a concept by _Drew Diamond VK3XU_, details a practical build using readily available components. The unit incorporates four plug-in coils, covering a frequency range from **2.6 MHz to 55 MHz**, mounted on 5-pin DIN plugs for versatility. A salvaged two-gang air dielectric variable capacitor, fitted with a vernier reduction drive, serves as the tuning mechanism, with the smaller gang optimizing bandspread at higher frequencies. In practical application, the dip oscillator is used by setting the meter needle to approximately two-thirds scale. When the instrument's coil is brought near a tuned circuit under test, a noticeable dip in the meter reading indicates resonance. This allows for precise measurement of resonant frequencies in antennas, filters, and other RF circuitry, proving invaluable for homebrewing and troubleshooting. The design emphasizes short wire runs for stable operation, particularly at the higher end of its operational range.

A compact Yagi with bent Driven Element. Worlds smallest yagi that did EME QSO

Amateur radio makes the world a much smaller place.

This is my small station here in the isle of La Palma, Province, S.C. Tenerife.

This article describes the development of two tunable antennas each consisting of three interconnected small loops and capable of providing excellent DX performance. The aerials are home-constructed, and located in a very small garden with a minimum of visual impact on the neighbours and are low enough in height to avoid the attention of UK planning authorities.

Independently published since 1987, home power magazine and homepower.com are resources dedicated to small-scale renewable energy and sustainable living technologies.

Diary of a small contest group

A CW sidetone bypass for the NESCAF audio filter, a small and low cost circuit that works great.

Bergey Windpower is one of the world's leading suppliers of small wind turbines

KTune is a small utility that allows you to use a Griffin Powermate USB knob to tune your Elecraft K3 radio.

Small Parts, Inc. has been supplying top quality Materials, Components and Tools to Researchers and Developers since 1963.

Founded by a small group of young hams in East St. Louis, Illinois, the W9AIU Egyptian Radio Club serves as a local amateur radio organization. The club's origins trace back to meetings held in Herb Wilhelm's, W9APX, dry cleaning shop, indicating a grassroots beginning for this community group. It operates as a typical ham radio club, fostering camaraderie and likely supporting various aspects of the hobby for its members. As an amateur radio club, W9AIU likely engages in activities such as local nets, field day operations, and perhaps provides licensing support or technical discussions. Such clubs are crucial for new hams seeking mentorship and for experienced operators looking to participate in group activities like contesting or public service communications. The club's presence in Illinois suggests a focus on local and regional amateur radio initiatives.

Windows free sound recorder. What you save is what you hear ! Small utility program to capture and save any sound played by your computer. Audio recorded can be converted in MP3 format.

This antenna is designed for stations having a difficult time putting a decent signal on 160M from small or CC&R d lots. It is a 24.5 ft. vertical antenna, made from three 10 ft. PVC sections bolted together, and half wavelength of antenna wire helically wound around the PVC sections.

An antenna system is electrically small if it's enclosing sphere is <&#955;/2&#960;. So a 10m band antenna of under 1.6m long qualifies.

A portable (15.5 foot diameter) NVIS loop for 3.5 to 7.3 MHz. Performs well at high and low takeoff angles, and has smaller footprint than most NVIS antennas.

The Hidden Valleys Amateur Radio Club is a small friendly club located in the hills and valleys of Southwestern Wisconsin.