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RCKLog is a windows freeware program for logging and administration of SSB and CW-Contest with simultaneous control of transceiver and real-time operation of Packet-Radio. -
An Off-center-feed antenna that covers 80, 40, 20, 17, 15, 12, 10, and 6 meters -
Cheap Antennas for the AMSAT LEO Kent Britain WA5VJB -
A free to download and print, paper log sheet useful for portable amateur radio operations, in a PDF file. -
Every ham needs an RF power meter. Here is a high performance unit to build at home. -
Notes on Axial-Mode Helical Antennas in Amateur Service. Helix Basics, Modeling Issues, and Short Helical Antennas Over Perfect Ground -
Transistor and its history and lot of related infos -
How to operate on 10 and 20 meters in limited space with this trapped dipole. -
This document details the design and construction of a Vinecom 6N4 dual-band Yagi antenna for the 50MHz (6-meter) and 70MHz (4-meter) amateur radio bands. The antenna features 9 total elements (4 elements for 50MHz, 5 elements for 70MHz) on a 4.236-meter aluminum boom. Computer simulations using MMANA software predict 7.21 dBd gain on both bands with front-to-back ratios of 16.01dB (6m) and 15.37dB (4m). The design uses 12.7mm diameter elements mounted on a 32mm square boom, weighing 5.7kg total. Practical measurements with an MFJ-269 analyzer confirmed good SWR performance across both bands after element length adjustments. -
The document provides a comprehensive overview of baluns, which are devices used to connect balanced loads, like dipole antennas, to unbalanced inputs, such as coaxial cables. It covers various types of baluns, including voltage and current baluns, and their design, construction, and testing. The text discusses the importance of baluns in preventing RF currents on coax shields and their applications in Ham radio setups. It also includes practical advice on selecting and using baluns based on antenna impedance and power ratings, along with detailed performance evaluations and construction tips for different balun configurations. -
A PDF presentation of a home made moxon antenna for 50 MHz 70 MHz and 144 Mhz. The project is mainly out of surplus plastic Plumbing pipes and clips etc, and also details of how the dimensions were calculated. -
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If you have space constraint at your QTH for a HF antenna, you can try contructing this HF magnetic loop antenna for 40-20 meters bands -
A 2W 80 meters transceiver assembled into a toaster case. -
This is a design for a stealthy HF multi-band vertical wire antenna using a tree as a supportby G7AQK -
A bowtie antenna is a type of antenna that reputedly provides higher gain at lower radiation angles than a center-fed dipole antenna at heights considerably less than 1/2 wavelength above ground. -
2,6 and 10 meters beacon located at Lake White, Ohio -
An active receiving antenna for 10 KHz to 20 MHz, a very small sized antenna with excellent performances in noise to signal ratio. -
This document contains the detailed instructions to build a homemade lindenblad antenna using a twin-lead as dipole elements. This document contains 9 pages and includes a detailed construction sequence and some drawings to build this antenna for UHF and VHF ham radio bands -
Homebrew a compact yagi antenna for 14 Mhz suitable for those with small plots based on a design by AB4GX -
A home made yagi antenna featuring 6db forward gain and 22 Db front back -
A sourge arrestor for PL 259 connectors. A voltage surge arrestor to limit the voltage that may come back down the wire or coax after there has been static build up -
A 21 MHz Four Square Beam Antenna This popular antenna for the lower bands, can also work well on 15 meters, QST Article -
A solutiom for the Ameritron AL-811(H) RF power amplifier, burnt panel meter lights. A common failure with the Ameritron AL-811 and similar amplifiers is that the panel meter lights burn out prematurely. These bulbs are usually integrated into the actual panel meter. The solution for this is to provide the meter backlighting with LEDs. -
Adding extra directivity to the Moxon Rectangle for 6m, 4, and 2m -
Improper grounding or earthing system can cause several unwanted RF interferences (RFI) to television sets, broadcast receivers, hi-fi sets and telephone sets. In this Article the author explain how to setup a proper radio shack grounding using coaxial cable and ceramic disc capacitor -
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Service manual in PDF Format for the Yaesu FT-7800 transceiver -
An end fed 20 meter half wave antenna -
VHF UHF diplexer by G8MNY -
A moxon rectangle for 50 Mhz band -
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A Useful Horizontally Polarised Omni-directional Antenna with Gain for 144 MHz -
Part 2 You're now much closer to saying goodbye to your unwanted signal problems! -
A compact antenna for 160 meters, suitable for hams tha want operate top band buh have a limited space -
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A PDF presentation about Amateur Radio and Linux by By: Dave Mamanakis. A beginners guide to Linux for radio amateurs, this presentation cover basic concepts of the open source operative system, from the basic installation to the setup of ham radio programs. -
An home made vertical dipole antenna made with simple material. The antenna has a total length of aproximately 16 feet. In this article appeared on June QST 2019, the author explain how he reached the optimal confirugation changing and adjusting the lower part of the antenna, trimming and spacing correctly the copper wire. PDF File to downloas -
A scanned PDF of this interesting book on HF Dipole antennas published by Stanford Research Institute -
Roger, G3XBM, shares his extensive experience in **QRP** (low-power) amateur radio operation, detailing various aspects of transmitting with minimal power. The resource provides insights into VLF (Very Low Frequency) reception techniques and the construction of simple **crystal radio sets**, reflecting a foundational approach to radio experimentation. It includes links to external resources covering QRP clubs, online receivers, manufacturers, and technical references, offering a curated collection for enthusiasts. His page serves as a hub for those interested in the challenges and rewards of QRP, often comparing the efficacy of different low-power setups. The practical application extends to understanding basic radio principles through hands-on projects like crystal sets, which G3XBM has explored. The collected links provide a starting point for further research into specific QRP equipment or operating practices, drawing on G3XBM's long-standing engagement with the QRP community. -
Web based VHF-UHF RF planning powered by SPLAT! and Google Maps. Access via website, Android App or dynamic Google Earth interface. -
This interface is intended to be used with all the popular digital modes like PSK31, RTTY, Olivia, etc., which modulate a continuous carrier. -
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Schematic of Yaesu FT-857 main board original jumpers based on different radio type -
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Optimizing performances of the end-fed antennas QRP quarterly article -
An excellently presented article on the design and construction of a medium wave DX Antenna -
In this article K3DAV show a very simple way to make an RF choke coil that will remove your RF feedback troubles -
Packet Radio networking home page with lots of informations and tech. resources -
