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This article explores the claim an amplifier might arc from a parasitic oscillation, damaging capacitors, bandswitches, or other components.

17-Element Very High Frequency/Ultra High Frequency Log Period Dipole Array

Ameritron AL80B AL811H AL572 Amplifier Trouble Shooting. Tubes replacement, resistor changes.

An interesting project of the popular IW3HEV antenna analyzer in and embedded solution by PA3CKR.

Dimensions for the inverted V antenna from 160 to 2 meters by N6JSX

Cobalt Pet is a weblog focusing on shortwave radio. It features shortwave reception reports, product reviews, photos, listening tips, and links. International broadcasters and amateur / ham radio operators are monitored and discussed.

Amateur Radio Projects & Kits for homebrewers, includes DDS,sound card interface,programmers, hamcom, frequency counter, RF Power Meter, modems and more.

Windows user-mode application, which allows you to create software virtual serial ports and emulate physical serial ports behavior. It operates exclusively in user-mode, therefore it is more stable and uses less memory, processor and operating system resources than any competitive products.

Optimization tests of the W3EDP multi-band HF wire antenna a popular aerial among QRP enthusiasts because it is light weight and cheap.

Optimizing performances of the end-fed antennas QRP quarterly article

A delta loop antenna for the 4 meter band by GW7AAV

Kenwood TS-590S remote control software

Hobby kits and electronics, semiconductors, components, batteries, ham radio gear and more. The store sells a variety of electronic components including resistors, capacitors, and fuses. They also sell tools such as screw connectors and box cutters. Some of the featured items on the website are Nixie tube clock kits and battery holders.

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.

A guide on writing reports to broadcasting stations and obtaining QSL cards

Australian dealer for UHF CB radios, Amateur Radio HF VHF Radios, GPS navigation systems, two-way radio, cordless telephones, radar detectors, marine electronics, amateur radio gear and many other consumer electronic products.

A 40 meter NVIS beam antenna by W4NVK

BTW is a group of beacon information views and tools to enhance the enjoyment and usefulness of the NCDXF/IARU International Beacon Network and HF radio operation.

Links to cb radio operators web pages

Search for NVIS on google groups

Thousands of electronic and electro-mechanical parts and supplies

Accessing local public service communications often requires specific frequency data, and this resource provides extensive scanner frequency lists for the Greater Cleveland area. Originally compiled by Russell Imburgia, _N8RI_, these compilations were previously hosted on the now-defunct Greater Cleveland Hamnet BBS. The data is presented in two distinct formats: one sorted alphabetically by city and another organized numerically by frequency, allowing users to quickly locate specific channels based on their preferred lookup method. These lists are noted for their thoroughness in covering local public safety, business, and utility communications within the region. While the primary lists are copyrighted by N8RI, permission is granted for non-commercial reproduction, provided the copyright notice remains intact. The page also directs users to an external frequency database maintained by Jon Anhold, _N8USK_, offering an additional avenue for frequency information.

In this article K3DAV show a very simple way to make an RF choke coil that will remove your RF feedback troubles

Radio programming software for the ICOM IC-R10 receiver

US Antenna manufacturer offering base and mobile antennas for 2 meter, 1.25 meter and 70 cm Amateur Radio GMRS and MURS Citizens Band Radio VHF and UHF Business Band Radio HF, VHF and UHF Scanning

Connecting the iPad or the iPhone to a Yaesu FT-817 using an home made cable, using common digital modes like PSK31 RTTY and SSTV. Article by Andrew VK3BQ

Yaesu FT-1000MP Mark V Field review by W4TI

One point eight MHz to 30 MHz is the operational bandwidth for this 4:1 Ruthroff voltage balun, designed to interface an unbalanced T-Match network with a balanced antenna system. The project details the construction using a _T200-2_ powdered iron toroid core, tightly wrapped in PVC electrical tape for insulation, and wound with 17 double bifilar turns of 1.25mm enamelled copper wire. This outboard balun offers flexibility, allowing hams to trial various baluns based on antenna system and impedance characteristics, rather than integrating it directly into the tuner. The resource includes a schematic of the balun, a wiring diagram showing winding connections, and a table suggesting alternative toroid cores like the T80-2 or T400-2 with corresponding winding counts. Component sourcing is straightforward, listing items such as the _Amidon_ T-200-2 core, SO-239 connector, and a sealed polycarbonate enclosure from Jaycar. Performance evaluation was conducted using an _AIM 4170C_ antenna analyser, demonstrating efficient 1:4 voltage transformation across the specified HF spectrum. Further efficiency tests involved measuring RF power loss at various frequencies, revealing minimal loss—less than 0.7 dB from 3.6 MHz to 30 MHz, and only 2.0 dB at 1.8 MHz. These measurements, performed under ideal 50-ohm conditions, confirm the balun's effectiveness as a low-loss interface for multi-band antenna systems. The page also links to several other balun and unun projects, including 1:1 current and voltage baluns, and 9:1 voltage ununs, providing a broader context for impedance matching solutions.

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

Western New Yorks largest radio store since 1961

A list of free to download CPS Motorola radios programming software. GM3188, GM3688, GP3188, cp1600 cp1300 and some more.

Reducing noise and RF in your radio station by grounding your equipment in the proper way. PDF article by Xtal Staff.

Somalia

Search for recent spy numbers listening or add your loggings.

LoTW and eQSL export utility for Windows allows you to export your LOTW and eQSL marked qso's from Logger32 or an existing ADIF file. This program has been discontinued by author in favour of L32 LogSync.

Packet Radio networking home page with lots of informations and tech. resources

Get on SSTV FAST with this quick tip quide. All the info you need to get started quickly.

QRP and other projects from Honolulu, HI

VK3YE magnetic loop antenna plan that cover 7 Mhz to 20 Mhz and shortening loop can work on 21 Mhz.

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

A simple coax dipole antenna for 144 MHz by 9A7PJT

An online J-Pole antenna calculator that need just to input the frequency and calculates in inch size of each element

Official Kenwood page about the TS-50 HF Transceiver

Deploying robust antenna infrastructure for both fixed and portable operations often requires specialized support structures capable of withstanding environmental stresses while providing optimal radiating element placement. SMC offers a range of solutions, including pneumatic masts and push-up masts, designed to facilitate rapid deployment and reliable long-term support for various antenna types. Their product line encompasses antenna mounts, poles, and complete antenna systems, addressing the critical need for stable and efficient RF communication. The company's offerings extend to HF antennas, including dipoles and _NVIS_ (Near Vertical Incidence Skywave) antennas, which are crucial for short-range regional communications on bands like 80m and 40m. These systems are engineered for durability and performance, ensuring signal integrity across diverse operating conditions. With over **65 years** of experience, SMC has established itself as a global manufacturer in this niche. Their product portfolio also includes antenna support towers, catering to more permanent installations requiring significant height and load capacity for multiple arrays.

A wide band active loop receiving antenna project

CW Midi for Windows and for DOS (free), morse code MIDI file creator

Thierry LOMBRY, ON4SKY, develops in several long articles the bascis of propagation. His website includes also a French section dealing with auroras.

Digital Vector Wattmeters, Dummy loads, software defined panadapter systems, SteppIR Tuning Relay, Digital SWR meters, LP-Pan Pan Adapter IQ Decoder for SDR based panadapter system

Yaesu FT857D No TX Audio, video on reparing and yaesu Mic modification, with audio improvements for SSB and FM

Crystal-controlled QRP tranceiver by F6BCU for 80 meters band 1W output