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Aerial 51 is an antenna manufacturer producing HF Wire antennas. Their antenna product catalog includes portable, OCF wire antennas for HF bands but also QRP transceivers, and accessories for portable operations.Based in Germany

April instrument, manufacturer of programmable microwave signal generators

RF Samplers and demodulators

ECARS began operation in 1968 as an Amateur Radio public service net for mobile operators on 7.255 MHz

Old Cars and Amateur Radio. This club has a repeater on site of the World Longest Running car cruise. Part of the ARRG.US network

A simple DIY signal generator based on NorCal QRP club kit

Founded in 1924 CSRA is one of the oldest ham radio clubs in the USA

CT1FUI - Amateur Radio from Portugal , QSL card collection from 90's

Dubus article about DL6WU long yagi antennas for 23 cm band Article is both in german and english. Yagi antennas are valid alternative to dishes for troposcatter operations. This article explains design and mechanical data for 1296 MHz Yagi Antennas

The resource provides an interactive map interface for locating amateur radio license holders across the United States. Users can input a _callsign_, _gridsquare_, zip code, or street address to center the map, which then dynamically populates with station markers. This functionality allows for precise geographical searches, revealing the distribution of hams within specific areas. Upon initial search, the map renders with adjustable zoom and pan capabilities. A key feature is its automatic reload mechanism: after two seconds of inactivity, the map updates to display stations within the newly viewed area. This ensures that the displayed data remains relevant to the user's current focus, whether exploring a densely populated urban center or a more remote region. Further interactive elements include clickable gridsquare labels, which re-center the map, and a "Show gridsquares" checkbox for toggling grid line visibility. Clicking on individual station markers reveals a popup containing the licensee's name and address information, making it a practical tool for geographical station identification.

Common problems of the 572B tubes often used in many RF Power Amplifiers

This group is for support and discussion of the Baofeng UV-3R micro dual band VHF/UHF radio.

Read more about the purpose, policies, and procedures of The National Traffic System in this 48 pages PDF File

A multiband Fan Dipole that works on 40 20 15 meters band, making a folded dipole for 7 MHz band and additional element for the 21 MHz and 14 MHz

X1M QRP SSB CW HF transceiver by K7JOE

Homebrewing a Lightweight linked dipole HF antenna for portable SOTA operations

The _Alessandro Volta RTTY Contest_ is an annual digital mode competition focusing on Radioteletype (RTTY) operation, challenging participants to make contacts across various HF bands. This event typically occurs in January, drawing a global field of operators aiming to maximize their QSO count and multiplier accumulation. The contest emphasizes accurate exchange of signal reports and serial numbers, with specific rules governing single operator, multi-operator, and SWL categories. Participants utilize software like _N1MM Logger+_ or _WriteLog_ to manage their logs and generate Cabrillo files for submission. Scoring is based on points per QSO, multiplied by unique DXCC entities and Italian provinces worked on each band. The contest encourages both seasoned RTTY contesters and those new to digital modes to engage in competitive HF activity, promoting skill development in digital communication. Final results and logs are typically published on the contest website, showcasing top performers and providing detailed breakdowns of scores.

This antenna is a vertical loop antenna mounted on a 8 meters high grounded mast with an input impedance of 50 Ohms without a matching device

An overview of digital HF radio operating modes includes a sample audio recording of each digital mode by WB8NUT

K6BJ UHF MSF5000 Repeater Construction Log

Live Audio Feed of the KI4FVI repeater in henry county Georgia

MARS modification instructions for the Yaesu FT-450D

Repairing and restoring a Tektronix 465 oscilloscope

W1WD review and reception performance test of the Elecraft K3 transceiver.

Supplier of RF, Microwave, & Wireless passive coaxial components, including Coaxial Attenuators, Adapters, Cables, DC Blocks, Terminations, & Connectors

10 meter 28.286 mhz 100 milliwatt Beacon

Our mission is the promotion and advancement of amateur radio activities within our county and surrounding areas.

Homebrew, QRP, Beacons & Diplomatic / Spy Radio

Relevance of a proper ground systems on short HF vertical antennas, with an analysis on a vertical antenna for 160 meter band

Simulation of a top loaded vertical antenna for 1.2 MHz

This EXCEL Program Worksheet calculates the common-mode impedance of a 1:1 Guanella (current) balun which is placed at the feed point of a balanced antenna system fed via coax.

This is a popular discussion forum for ham radio operators

VR-120 Commander is a windows programming software for the Yaesu VR-120 and VR-120D

HF/50 MHz 100W All Mode Transceiver. The FT-891 provides stable 100 W (25 W AM) high power output

On 7.274 MHz since 1955

The Icom IC-7600 compared to other Icom HF radios , like IC-756Pro III, IC-7700 and IC-7800 by VA7OJ/AB4OJ

A six meter band 3 element yagi beam antenna project with shortened elements using coax cables with the outer ends stripped and the center conductor shorted in somewhat of a Bazooka antenna.

Pro and cons of Digital ATV versus Analogue ATV

An excellent and comprehensive article on portable HF operations with attention on selecting proper equipment

In this article, author examine stresses placed on common-mode chokes (aka baluns) as hams use/abuse them, examine the efficiency of simple dipole multi- band antennas and their feed systems. Stressing a Balun.

There is a specific procedure which must be followed if proper adjustment of a shunt matching coil is to be achieved.

Radio DX club based in sweden

Official summits on the Air discussion group

A low cost, low power microwave transverter so that you can operate easily on 70cm band even with a HF or VHF transceiver

How is your SWR - determine the power loss to expect for a given SWR, includes an excel spreadsheet by n3ujj

Rotatable Antenna with Phased Elements based on the orignal design concept of HB9CV antennas, is considered to have an higher gain than standard quad antennas. The Swiss Quad Antenna does not need any spreader or boom.

This blog is a space devoted to primarily, but not limited to, my experiences with and ideas about Amateur Radio, QRPing and Morse Code.

Here is a story of installing field expedient PL259 coax connectors on ordinary Cable TV F11 an Rg11 equivalent

ICNIRPcalc allows you to calculate safety distances for many know amateur radio antennas with respect to ICNIRP limits by DL9KCE