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249 links - and 2 categories

Make your own 2 metre 5/8 whip antenna - This article is about a home made project of a whip antenna for 2 meters band. Includes lenght of whip for all frequencies from 140 MHz to 151 MHz both in mm and inches
[ Hits: 386 | Votes: 1 | Rating: 5 ]

40m Vertical End-Fed Antenna - A quarter wave vertical end-fed antenna for the 40 meters band. As all vertical antennas, also this aerial requires a good earthing system. In this project the ground is composed by twelve 4, wires buried in the lawn by using a spade to create a slit to drop the wire into.
[ Hits: 2692 | Votes: 7 | Rating: 5.43 ]

50MHz / 6m J-pole Antenna by VK4ADC - The J-Pole is an easy-to-build and inexpensive device that provides an omni-directional vertically polarized antenna without the need for a ground plane. In technical terms, it is an end fed vertical 1/2 wave which is fed via a 1/4 wave matching stub.
[ Hits: 442 | Votes: 4 | Rating: 6 ]

Magnetic Loop antenna for VHF - A magnetic loop antenna for the VHF band, featuring a high gain that can be compared to a quarter wave vertical antenna
[ Hits: 734 | Votes: 9 | Rating: 5.99 ]

Antenna Mast Guying for Amateur Radio Antennas - Article based on ROHN engineering specification that will guide on proper guying heights and guy lengths when guying ham radio antenna masts. It will help you determine ahead of time the proper length of guy wires and the distance from the base of the mast to the anchor points
[ Hits: 316 | Votes: 3 | Rating: 7.67 ]

Semi-automatic antenna tuner project - Thsi article describes a microcontroller driven semi-automatic antenna tuner capable of handling power levels up to 150 watts. The device is a low pass filter tuner manually tuned by setting the optimized L/C combination by hand and then storing the values into the EEPROM of the mictrocontroller to recall them later (seperately for each band from 80 to 10 meters including WARC bands)
[ Hits: 291 | Votes: 0 | Rating: 0 ]

N8FQ sked page - A multi sked portal offering sked spots grouped by CFO CW Practice CW Academy Development Digital FISTS Down Under FISTS Scouting LoTW/eQSL MARS NAQCC NRR Other Images POTA Ragchew Satellite SKCC TBDXC VHF/UHF
[ Hits: 272 | Votes: 0 | Rating: 0 ]

The Transatlantic Tests - From 1921 to 1924, radio amateurs experimented with transmitting across the Atlantic. Everyday Engineering magazine organized the first sending test with English amateurs prepared to listen for signals from the US
[ Hits: 343 | Votes: 0 | Rating: 0 ]
An Overview of US Amateur Call Signs - Past and Present - QST article from May 1994 about history of call signs from the very beginning to present system. Article explains call sign allocations, call areas, prefixes for novices and prefixes like K WA WB WD, callsigns during and after the world war II and other curiosities on US Call signs.
[ Hits: 427 | Votes: 0 | Rating: 0 ]

Icom 7610 vs Flex 6400M - An article comparing the Icom 7610 transceiver over The FlexRadio Flex 6400M
[ Hits: 516 | Votes: 0 | Rating: 0 ]

Decoding Numbers Stations - QST Article - Exploring these mysterious transmissions and how their strong following has created a niche in the community. Free article in PDF Format from QST November 2019
[ Hits: 519 | Votes: 0 | Rating: 0 ]

Grid Calculator - Grid Calculator allows you to calculate either a grid square locator or the latitude and longitude of a location. Grid Calculator can be used to calculate a Great Circle bearing and distance between two stations in statute miles, nautical miles, and kilometers.
[ Hits: 311 | Votes: 0 | Rating: 0 ]

Mini Satellite-Antenna Rotator Mk1 - This project is a portable device used to automatically point a directional antenna towards an orbiting satellite. It takes all the effort out of little kids holding the antenna and figuring out where to point it. It allows students to talk through Amateur Radio satellites or download weather satellite images.
[ Hits: 552 | Votes: 0 | Rating: 0 ]

UHF Connector - An overview about the UHF connectors often referred to as the PL259 plug and SO239 socket used for many RF applications. Limitations, history and soldering properly UHF Connectors
[ Hits: 352 | Votes: 0 | Rating: 0 ]
Ecoflex-15 Degradation - This article describes the problem detection on power loss events experienced during repeated usage of the Ecoflex-15 coax cable by members of the G3PYE contest minions and addressed to repeated coiling and uncoiling which has fractured the foil braid in numerous places.
[ Hits: 176 | Votes: 0 | Rating: 0 ]

Homebrew a High Performance SSB RTX for 14 MHz - This article describes the construction of a high performance transmitter and receiver for SSB (voice) communication covering the 14MHz (20 meters) high frequency amateur radio band with output range 15 to 20 watts and a top audio sound quality both on transmit and receive.
[ Hits: 347 | Votes: 5 | Rating: 7.8 ]

WSPR monitoring with RTL-SDR and Raspberry Pi - The goal of this interesting project is to monitor a particular set of frequencies for a set period of time. In this article your will find instructions to build and operate an all-band WSPR node using cheap hardware and free software. At the end of this you'll have a Raspberry Pi, connected to an RTL-SDR dongle that monitors all of the WSPR frequencies rotating randomly every 15 minutes.
[ Hits: 201 | Votes: 0 | Rating: 0 ]

SWR and Amateur Radio Antenna Tuners - Undestanding and measuring SWR, Standing Wave Ratio in antenna feed lines. This article also introduce basic concepts and usage guidelines of amateur radio antenna tuners
[ Hits: 219 | Votes: 2 | Rating: 9.5 ]

An Experimental Q Meter - The article describes Q factor, methods of measuring Q factor, inductance and capacity using a Q meter and the design of an experimental Q meter unit. The Q factor or quality factor of an inductance is commonly expressed as the ratio of its series reactance to its series resistance.
[ Hits: 235 | Votes: 0 | Rating: 0 ]

70cm Mini-Transverter Project - The project in this article illustrates how to do this in a simple and low cost way so that you can easily access the microwave bands using the existing HF or HF/VHF transceiver as IF.
[ Hits: 254 | Votes: 2 | Rating: 9 ]