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Feeding a G5RV Overview by VK1OD

Images and Radio Shack composition

A Comprehensive roundup of the most popular QRP transceiver kits on the market in recent years in PDF format

Demonstrates the construction of two distinct wideband RF preamplifiers, detailing their component requirements and performance characteristics. The first design leverages monolithic microwave integrated circuits (MMICs) such as the MAR-6, MAR-8, or PGA103, offering a broad frequency response from DC to 2 GHz with a gain of 22.5 dB at 100 MHz and a noise figure typically below 3 dB. This MMIC-based amplifier incorporates protection against power supply transients and features a 50 Ohm input/output impedance, operating from an 8-20 volt supply with low current drain. The second preamplifier design utilizes a BSX-20 transistor, providing amplification across the 14 MHz to 550 MHz range. This simpler, more economical build achieves an average gain of 12 dB at 145 MHz and a noise figure of approximately 1.1 dB. It operates from a 7-15 volt battery supply with a current draw of 6 mA. Both projects emphasize critical construction techniques, such as maintaining short RF connections, ensuring 50 Ohm impedance paths, and mounting the circuit within a shielded enclosure to optimize performance and minimize noise. The resource also discusses phantom power options for antenna-mounted preamplifiers and precautions for use with transceivers, including output protection diodes and static bleeders.

What Amateur Radio (ham radio) is. How to get started in ham radio. License requirements. Where to find instructions.

MorseMaker is an up-to-date replacement for the Morse Machine shown further down this page. It has been re-written using a different programming language and is now entirely 'stand-alone' requiring no run-time support files. This version also works with Windows XP and can use the soundcard but please note that, unlike its predecessor, it does not split the alphabet into smaller 'learning' blocks and does not incorporate the Morse reader.

How to easy connect two Pc together with a Ethernet Lan

A Study of Amateur Radio Gender Demographics. How many ham radio operators in the usa ? Estimated Number of Hams in Each State, by Gender

Moon bounce EME, meteor scatter and weak signal operations, introduction by ARRL.

An introduction to antennad including a DIY assembly instruction for a A Ground Plane Antenna for NOAA Weather Stations

Live Walton County Sheriff, Fire, and EMS Radio

The RTTY Net is one of several Nets run by the 3905 Century Club. There are SSB Nets on 160, 75, and 40 Meters and CW Nets on 80 and 40 Meters

A great source for hard to find HI END & power tubes & sockets, various capacitors, vacuum relays, various keys and paddles.

The easy way to calculate toroid cores.

This page shows W5AJ & KD5AAU setting up a self supporting crank over tower.

An RF power supply for 144 MHz schematics and instructions

ARRL page on SDR technology

HD Communications Corp specializes in **RF and microwave amplifiers** engineered for demanding communication, defense, and industrial applications. Their product line includes precision-built, high-power solutions, along with RF connectors, filters, HF cables, and various accessories. The company also supplies tower hardware, valves, and tubes, catering to a broad spectrum of radio frequency infrastructure needs. Beyond amplifiers, HD Communications offers a range of **RF filters**, including low-pass filters, antenna filters, and solutions for RFI/TVI mitigation. Their inventory encompasses essential components like coaxial cable and various connector types, supporting both amateur radio and professional installations. The company operates as a manufacturer and vendor, providing direct sales of its specialized RF products.

318 and 200 ft insulated towers

High Voltage Supply for GS 35B Amplifier

Dutch Antenna and Tower Manufacturers from Slimline Square Triangular Round Towers. Antennas production include Yagi Monoband/Dipole/HF Quad /50MHz and 70MHz Yagi-Quad, VHF-UHF yagi-Quad and Comby antennas VHF/UHF/SHF

RF power meter, dummy load, project

CW paddle made with a steak knife some simple hardware and a stainless steel fork

The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840.

Low power VHF RF amplifier with VMP1 Mosfet by IZ1BTS IK1XPD

A wip antenna for 6 meters band by JA1HWO

160m Is it a sloper? or tower drive?

In this article the schematic is of AA5TB QRP power meter and dummy (50 Ohm) load combination

Presents a detailed construction guide for a **Quadrifilar Helix Antenna** (QHA) optimized for 137 MHz, specifically for receiving weather satellite transmissions. The resource outlines the author's experience building previous QHA designs, highlighting challenges with tuning and nulls, and then focuses on a refined design by John Boyer, documented by Steve Blackmore, which proved easier to build and yielded superior reception. The guide provides precise element dimensions, including 1.5m of 32mm PVC pipe for the mast and 8mm soft copper tubing for the helix elements. It specifies lengths for horizontal tubes (190mm, 90mm) and helix elements (903mm, 1002mm), along with instructions for drilling, assembly, and forming a **balun** by wrapping RG58 coax around the mast. The text emphasizes critical steps like ensuring elements are square and twisting in the correct direction to avoid phase issues. It includes references to original QST articles by Buck Ruperto (W3KH) and the WxSat program for decoding satellite transmissions, contextualizing the antenna's purpose. The article concludes with a sample NOAA 12 image from September 1998, demonstrating the antenna's reception capabilities.

Some of the interesting shots of the W5AJ Rohn 25G tower

A multiband WebSDR receiver system, located in Bolton, England accessible via the RSGB web site

Dutch scanner web contains information about dtmf pagers gsm tetra umts scanners decoders.

If you are interested in the environment, the weather and other natural phenomena then there is something magical about being able to see pictures of the earth from space just as it is right this minute. One way you can do this is by receiving images from weather satellites.

9K2GS WEB Page

Essential tower tool invented through necessity.

Excel spreadsheet that help calculating dimensions of a high efficiency magnetic loop antenna for HF bands. Giving in input the loop perimeter, loop diameter and loop conductor will calculate electric characteristics, bandwidth, and efficiency

A 50 foot tower setup with pictures and installation details

This project was published in the April 2004 issue of the Australian magazine Amateur Radio, and has been designed using parts which are very readily available.

The sun can power your Ham station and a whole lot more. Using solar power panel with a 12 volt battery can permit you to operate autonomously even for several hours without interruption.

Sioux City Tri-State Area Fire/EMS, Sheriff, Police and Highway Patrol Live Audio Feed. Listen Sioux City IOWA live scanner

LAPD - Wilshire and Olympic Divisions Live Audio Feed using a Uniden 396T radio scanner

A 67 feet long dipole doublet antenna

XPWare offers support for AEA, Kantronics, SCS/Paccomm and Hal controllers. The program also offers full transceiver control for most of todays HF radios and support DX Cluster monitoring. No more supported and developed by author. Now freeware.

Rhombic antenna definition and articles by answers.com

1 watt amplifier for 10 ghz made from surplus stuff

For radio amateurs seeking compact and efficient antenna solutions, particularly for restricted spaces or noise reduction, HF loop antennas present a viable option. This resource compiles several articles from the ARRL, detailing the theory, design considerations, and practical construction of various loop configurations. Topics include small transmitting loops, receiving loops, and multi-band designs, often emphasizing their performance characteristics such as directivity, bandwidth, and impedance matching. The collected articles provide insights into the comparative performance of different loop geometries, such as circular versus square loops, and discuss the impact of conductor size and tuning methods on efficiency. Practical applications are explored, including their use in portable operations, stealth installations, and urban environments where noise mitigation is critical. The content often includes construction diagrams, parts lists, and performance data derived from modeling or field tests, enabling hams to replicate or adapt the designs for their specific operating conditions.

Information about amateur licensing: examination requirements, scheduled exam sessions, renewals, FCC and NCVEC forms, vanity call signs, volunteer examiners, fees, special-event call signs.

This low power transmitter is developed for ARDF exercising purposes but of course can be used as super QRP transmitter either. With 1 or 2 meter wire as antenna and a ARDF receiver with ferrite-rod antenna the range is about 100m but with better antennas and a 'real' receiver the range is probably much larger.

VU3NSH article on high current universal supply for rigs

This is an Excel spreadsheet template to design DL6WU Yagi antennas