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A Short Guide to Harmonic Filters for QRP Transmitter Output. - George Dobbs G3RJV

LPI personnel have combined experience over many years in servicing customers throughout the world. Our experience covers projects in some of the most lightning prone areas.

A Collection of EME Reflector Antennas and YAGI Arrays.

Kingston, Ontario, Canada A RAC Affiliated Club

Electronic components distributor

Manufacturers quality tone signaling, wildlife telemetry,avionics equipment,video transmision modems.

80 watt multi-mode amplifier using one of the newer S-AV36 Toshiba modules. Less than 50 milliwatts will drive it to full output in any mode.

High speed telegraphy without key clicks by SM5BSZ

Gage applied technologies designs and manufactures high-speed data acquisition systems, high-speed digitizers in pci / cpci / pxi or pc oscilloscopes, providing utmost measurement fidelity for high frequency signals.

K8CU technical topics article about high voltage breakdown tester necessary for testing of any high voltage components like vacuum tubes, high voltage capacitors, vacuum relay

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

Presentation about Practical Antenna Modeling Using the NEC Codes with examples of HF wire antennas and 4NEC2. How to define and edit the models, Running the simulations, Work some examples, Variables usage, Deal with Feed Lines and ground

Pictures of a homemade monoband linear amplifier for 160m band powered by 3 x QB5/1750

A keyed piezo beeper, connected to the microphone jack of a HT, appeared feasible as a ready-made MCW generator.

Basic information in spanish hon how to become ham radio operators, or radioaficionados

Electronics for Emergency Services Since 1974

Remotely-Operated 1200 Baud AX.25 Narrowband Packet Radio and APRS on a Baofeng UV-5RA and Raspberry Pi 2

Build you own RF probe, measure the level of RF voltage present at a particular point.

We encourage ham radio operators to try something new with the hobby.

Maxdao: offer you 7/16, N coaxial connectors, jumper cables, feeder clamps and grouding kits, surge arresters & brackets, wall entries and microwave components used in base tower, power dividers, couplers

The workaday world of antenna & tower projects. Posted by K4ZA, Tower Works, Charlotte NC.

European version of the ICOM IC-7610 leaflet in A4 Format PDF File

Constructing a digital interface for the Elecraft K2 transceiver, this resource details the "Fat Wire" design by WG4S. It demonstrates how to integrate a sound card for digital modes, outlining specific connections to the K2's microphone jack and internal audio path. The author shares practical insights from his build, including the use of _RG-62_ coax for its flexible braid and the strategic placement of components like the 2.2K resistor and _2N2222_ transistor. The guide provides a breakdown of the interface's internal wiring, specifying connections for AF In (pin 1), AF Out (pin 5), PTT (pin 2), and Ground (pin 7) on the K2's microphone connector. It also covers the external connections to a laptop's headphone and line-in jacks, along with a DB-9 connector for PTT control via _DTR_ or RTS lines. The author notes that his laptop's headphone output level was sufficient for the K2, negating the need for an attenuator. Reflecting on the design, the author, Dan WG4S, acknowledges a later suggestion to house the components directly within the DB-9 shell for a more compact build. This iterative feedback highlights the ongoing evolution of DIY ham radio projects and the community's collaborative spirit in refining designs.

This low pass filter terminates all harmonics from the 2nd to above the 10th harmonic in a better than 15 db return loss load

We stock a range of two way PMR446 radios. PMR 446 is a license free frequency, which means that you can communicate for up to 3km (terrain allowing) without any call charges or license requirements. They can be used in most European countries and are ideal for holiday trips.

QSL printing service operated by OK1FXX in Czech republic

The Hermes-Lite is a low-cost direct down/up conversion software defined amateur radio HF transceiver based on a broadband modem chip and the Hermes SDR project. It is entirely open source and open hardware, including the tools used for design and fabrication files. Over 300 Hermes-Lite 2.0 units have been successfully built.

Chaves Co. SKYWARN cares

IK6CAC windows shareware program to manage the USA County Award

Pictures, design plan and description of a 5 element yagi antenna for the 4 meters band by 9A7PJT

These are QRP rated 3 Pole Butterworth filters based on a design by K4VX, feature simplicity, almost no insertion loss, and reasonable rejection on the other ham bands.

Manufacturer of Repeater Controllers, Repeater Tone Panels and Telephone Interconnect.

A simple VHF quarter wave antenna from PL25

Tti is thurlby thandar instruments who manufactures advanced electronic test equipment for sale in the uk and throughout the world.

A project for a vertical antenna for 60 to 20 meters by KV5R

An interesting presetnation full of usefull tricks to correctly design and build 23 cm Yagi using simple tools. The basic design of the antenna presented in this document is taken from the original DL6WU Yagi Design published in 1982

Asepects of grounds in mobile oeprations setups

LDG z-100 autotuner review by GW6ITJ

SSTV & ATV "only" Webring. Many members world wide.

Central Oregon DX Club N7LE

Por una Radioaficion unida y solidaria . Uruguay

Tips and advice compiled from The DX Reflector

Information about setting up a Solar Powered Ham Radio Station.

A browser based circuit simulator offering a large set of functionalities allowing to share and discuss designs

Ham Radio fonts that have the slash zero also morse code fonts

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.

A collection of modifications for the Icom IC706 transceiver

The Ham Cram method is designed to prepare you for the FCC tests in the shortest time possible giving you the highest level of confidence. It's totally free.

A 500 kHz to 5.5GHz 2-port vector network analyzer designed for use with any Linux, Windows or MacOS computer. High performance: up to 80 dB dynamic range in the MHz range; up to 40 dB in the GHz range