Search results

Project with pictures and descriptions for building a portable 12 Volt DC power source by N1KXR.

A few pictures of an homebrew magnetic loop RTX antenna project, working from 30 to 12 meters with excellent results

Pictures and detailed instructions on installation of the LightningBolt Quad antenna

Thierry LOMBRY, ON4SKY, develops in depth and with original pictures the long history of amateur radio all through the world from 900 BC to date.

A battery voltage booster project with pictures and schematic by KD7W

The international service of Czech Radio offers a broad, unbiased, and up-to-the-minute picture of life in the Czech Republic.

NOAA HRPT - High Rate Picture Transmission, the main source of high quality data from polar orbiting meteorological satellites

The page provides detailed instructions on how to build a 60 meter End Fed Half Wave Antenna Tuner, with large pictures and diagrams. It is aimed at amateur radio operators looking to construct their own antennas for the 60 meter band.

This page describes some repair tasks related to the Kenwood TS-850 transceiver. You will be guided through the repair proces step-by-step followed by descriptions and pictures.

Article on setting up a shotened beverage antenna with picture and setup notes by VE1ZAC

A 2 elements delta loop antenna for 14 MHz with a MMana simulation file, dimensions, pictures of this aluminium tube based delta loop antenna, and matching system details.

The CSV19 is an homemade antenna launcher project. In this article you can find pictures, drawing, and material list

Paulo Sousa ham radio blog with QSL pictures

A home made 50 MHz KW power amplifier project with picture and PCB schematic by W6PQL

Mods.dk collection of Ameritron ALS-600 power amplifier

A copper J Antenna for 144 and 430 article with design, feeding methods and pictures

A project for a Moxon antenna for 7 MHz with pictures and EZNEC model

Pictures, details and specifications about Yaesu VX-170

VE3VN describe in this article how to raise a tri-band yagi antenna onto a DMX-52 tower with pictures and schemas that cover the whole raising process.

An on-line museum featuring over 400 pictures of radios and related items from the 1920's

BeaconSpot.uk provides an accurate, real-time picture of microwave and VHF/UHF beacons operating across Europe, alongside a worldwide listing of 6-meter beacons. The platform allows users to retrieve detailed data for individual beacons, facilitating in-depth analysis of signal characteristics and propagation paths. Interactive maps visualize beacon distribution by frequency band and display spot coverage for each station, offering a clear geographical overview of active beacons. The system integrates real-time DXCluster spots, sourced from contributors like Alain, ON4KST, and Pascal, F5LEN, and enables users to submit outgoing spots directly to the DXCluster. Beacon keepers can manage their beacon data, receive email alerts upon being spotted, and track their station's ODX (Outstanding DX) records. For every received spot, the distance to the beacon is automatically calculated and displayed, aiding propagation studies.

Three Yagi antennas for the six meters band by 9A7PJT. Include a 4 element yagi, a custom design 4 element, and a 5 element yagi with antennas pictures and design.

Dx-pedition in Lebanon on July 2004 by I1HJT - I1NVU - IK1QBT - OD5LN pictures and Log on-line it's available on web site. Qsl via I1HJT

A synthesized 2.3 GHz Amateur Television (ATV) transmitter design, conceived by Ian G6TVJ, is presented, targeting broadcast-quality video performance on the 13cm band and extending up to 2.6 GHz. The core of the design utilizes a commercial Z-comm Voltage Controlled Oscillator (VCO) that tunes from 2.2-2.7 GHz, providing a +10 dBm output and simplifying RF alignment. This VCO's stability, originally intended for narrowband applications, readily accepts high-frequency video modulation, contributing to the transmitter's robust performance. The exciter stage, incorporating a Mini Circuits VNA 25 MMIC amplifier, boosts the signal to +16dBm, while a Plessey SP4982 prescaler divides the output frequency for the synthesizer. The synthesizer employs a Motorola MC145151 CMOS parallel IC, favored over the common Plessey SP5060 for its superior video modulation characteristics and ease of programming without microprocessors. This choice addresses issues like LF tilt and distorted field syncs often seen with SP5060 designs, particularly when operating through repeaters or over long distances. The MC145151 divides the signal further, enabling precise frequency stepping, with programming handled by EPROMs for channel selection and LED display. The loop filter network, critical for video integrity, was developed through experimentation to prevent the PLL from reacting to video modulation, ensuring a clean transmitted picture. The transmitter incorporates a Down East Microwave commercial power amplifier module, delivering approximately 1.6W output, driven by the exciter through a 3dB attenuator. Construction involves surface-mount SHF components on micro-strip lines etched onto double-sided fiberglass board, housed within a tinplate box. The design boasts no AC coupling in the video path, preserving low-frequency response, a common failing in other ATV transmitters. Performance tests with a 50Hz square wave revealed no LF distortion, and a calibrated "Pulse & Bar" signal showed a near 100% HF response, demonstrating its capability for high-quality ATV transmissions.

Integrated PSK station for 80 & 20 meters without using a PC Pictures and diagrams by N2APB

Ten-Tec Orion II picture and specifications at RigPix

A nice review of the Acom 1000 HF and 6 meter RFpower amplifier by Acom in Dutch and with online google translation available. Includes pictures and notes of the popular amplifier by Acom.

pictures and description of QRSS activity

Homepage of radio club oz1als, contest results, pictures etc

UV-3R Review at G4ILO Blog with long textual review, pictures and some sound files

QRSS pictures and examples from IW0HK ex IW1CXZ

Pictures of home made antenna launchers

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

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

A homemade 23 cm transverter project with several building steps and pictures

X7 antenna pictures during installation and report on first contacts.

Ten-Tec Orion picture and specifications at RigPix

Amateur Radio Youtube Channel with some picture slideshow compilations by VK5SW

A Yagi-Mag antenna for the 4 meters band with NEC and MMANA files plans and pictures

Pictures of Hellschreiber machines as projected by Rudolf Hell

Some observations on the Yaesu FT-817 5W portable HF VHF UHF transceiver with some pictures and movies

General information page including contest scores, station pictures

23cm 1296 MHz Field Day Yagi Construction, a 26 element conventional-style design. Article with several pictures and detailed homebrewing instructions

TM-241E Picture and specifications

Full article on how to build a home-made wire dipole antenna for 40 and 80 meters band. Article is fully in italian, as it was published on ARI RadioRivista, but is plenty of self explaining pictures that will guide you on homebrewing this trapped dipole antenna for the lower amateur radio bands.

A multiband J-Pole antenna project that cover 144,220 and 430 MHz. The articles includes several pictures of this multi-band antenna, including handmade schematics and diagrams, project is mainly in Italian

Pictures and information about a solar powered station located in an old caravan in the Australian Bush by VK5SW

Picture gallery of VR2IO morse keys

Baofeng UV-5R dual band handheld transceiver, features, pictures, movies, links and manual.

Pictures of the restructuring of the ham shack starting from an existing garage. Changes includes isolation of walls and roof and rebuilding of the radio table.