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A portable amateur radio station which the radio amateur can take when asked to go to an event which needs support with radio communication.

Build this cheap and easy satellite downlink antenna

How to build a simple WSPR beacon using the Raspberry Pi for the transmitter

Building a high voltage (5KV), variable plate capacitor (17 to 220pF)

Using our components you can build a rotating tower with greater capability than 3-4 static towers. A rotating tower allows common rotation of HF stacked arrays, VHF and UHF arrays, and antennas mounted at optimum heights. Component design also allows tower shunt loading and end support for wire antennas

Building an RFD antenna, a easy to build portable aerial

Public service, repeaters, elmer program, training and testing. Programs for kids, YLs, OMs, new hams and old. Contesting, kit building, fun and fellowship. Meetings on the first and third Thursday evenings.

A range of easy-to-build RFI filters by John Regnault, G4SWX

A field strength meter, a crystal tester and a capacitance meter by Peter Parker VK3YE

CO2KK exposes some myths about using 75-ohm feedline with 50-ohm rigs and show how to build a cotanget transformer

Italian page about a home made a 1 to 40 balun with pictures and measurements on HF bands.

What VK4MDX/vk2kmi learned from building his own G5RV antenna and the ZS6BKW variant.

Here we have a ground plane antenna mostly used for 144, 222, 440 Mhz. Its one of the simplest antennas to make. New hams can build this with little to no experience in antenna building.

OZ2OE Technical Home Page - Building a circular polarized yagi

A Unique VHF Antenna with gain over a J-Pole Jose I. Calderon, DU1ANV

Ebook by Akira Matsuzawa Tokyo Institute of Technology, Building blocks in RF system and basic performances, Device characteristics in RF application , Low noise amplifier design, Mixer design and Oscillator design

A project of a 5 Antennas Relay Switch Box, all Switches & Relays have both contacts wired in parallel to improve reliability of operation, to prevent static build up, when an antenna is not in use the feeder coax is grounded.

How to build a lightweight amplifier that can be backpacked around.

Build an effective dipole antenna that needs much less space by adding two loading coils. This online calculator tells you how.

Mailing list for people interested in building radio and electronics equipment from kits or from scratch. Frequent topics include shortwave radio receivers, construction techniques, and ham radio project.

A Loop Fed Array Yagi antenna for 50 MHz featuring 11 dBi gain and 23 f/b ratio. In this excellent page the author even includes a detailed drawing in DWG format, with element lenght and spacing measures, in a separa file a full list of material list needed to build this yagi antenna including source and price, the EZnec file for this antenna plan, and a lot of pictures of this LFA Yagi for 50 Mhz. A ten page PDF file containing all infos, is also available to download.

Documentation to build your onw 80m ARDF receiver

Constructing the QE19 Antenna Launcher

The antenna build into this project is made from 2 fishing poles on a fiberglass pole in the center.

The page provides a project for an helical dipole for the 40 meters band, resonating on 7 MHz, created by PY1ZFK based on a design by DL8VO. It includes detailed instructions on building the antenna.

How to build a slingshot antenna launcher. Slingshot antenna launchers are used to launch a line over a tree branch, so antennas can be suspended from high up trees

Inspired by Milan OK7GU, the goal is to build an universal antenna controller - for different types of rotor, different motor, encoder

T2FD A practical construction article, which first appeared in the Electronic DX Press, contains a number of useful photos and detailed instruction to build this antenna by VK3BVW

A web site dedicated to hex beam homebrewing. The hexagonal beam has become a wildly popular antenna. It is a directional antenna that provides great performance and does not require a full scale, expensive tower.

A multi-band portable vertical antenna can be built with relatively ordinary components obtained from the local hardware store, including replaceable loading coils

To build a Band Decoder to drive our remote relays, we need to supply the band information from the rig to the decoder

Build your own band decoder, for kenwood rigs too

When building antennas for the Wifi band , a need for an easy way to check the antennas arise. This is a project for a 2.4 GHz band SWR Meter

Building the WB2HOL foxhunting beam antenna

Interesting article on how build your own field day antenna

A rebuild job on a Heathkit SB-200 amplifier by N4NAB

This article compares two commercial vertical antennas for the 4-meter amateur radio band: the Watson WVB-70 half-wave and the Sirio CX4-71. The Watson measures 2.03m in length, costs around £40, and exhibited adequate performance but required additional waterproofing after rain affected its VSWR readings. The longer Sirio CX4-71 (3.02m) performed noticeably better, delivering signals approximately 2 S-points stronger than the Watson. The Sirio demonstrated high build quality, a stable 1.2-1.4:1 VSWR, and weather resilience, though minor VSWR fluctuations were observed during rain and frost. Both antennas are half-wave designs requiring no ground plane radials.

Two Delta-Loops in phase. The purpose of this article is to propose an antenna with a high gain, a high efficiency and a very low price that is easy to build for any frequency.

K8CU builds a classic 1967 QST semiconductor project during the 40th anniversary year of the original project publication.

Measurements for building a full wave loop using wire

Building the double size G5RV antenna, part list, assembly part, dimensions and assembly instruction in a pdf document

Design and build custom electronics for clock enthusiasts, Juke Box collectors and the ham radio community. Produces radio interfaces, and radio upgrades.

Building Eggbeater II Omni low Earth orbit satellite Antennas for 70cm by ZR6AIC

This article contains the measurements for building a full wave loop using wire and length of 1/4 Wave Coax Matching Transformer

A DIY guide to build your own compact multiband HF antenna based on the G3TXQ version using a 1:4 balun. This article includes the full part list and instructions to assembly, including the center plate.

Design and build an 6 m dipole antenna from aluminum, tubing, that resembles the active element of a yagi beam antenna.

Building a 1:1 balun, aka un-un, with an Amidon Ferrite toroid core T 200

How to build a phasing harness for stacking antennas

Isolation vs antenna separation an interesting article by WA6ILQ

Project to build sets of band pass transmitting filters for reducing the interference between HF transceivers operated in close proximity