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Online websdr receiver based in Rome Italy provides a nice user web interface and receiver most of the amateur radio HF bands

AM DXing taken to the extreme. Reports and station logs from DXpeditions to Arctic Northern Finland. Also articles, QSL news, links, audio and video on AM DXing. Published by Finnish DXer Mika Mikelainen.

About basics of the horn antenna used for many rf microwave antenna applications.

First pictures and links for the Kenwood TS-990S HF and 50 Mhz transceiver releases in May 2012

Pacific Division of the American Radio Relay League

KD8KSB realization of the CJU satellite antenna that allow similar performance to the arrow antennas.

tk7 is open source software designed for the ICOM IC-Q7 walkie-talkie. Though tk7 is intended chiefly for Linux, MacOS X, and BSD users, it will work on Microsoft Windows too.

The direct conversion receiver described consists of only a bandpass filter, mixer IC, VFO and audio filter. With only 22 parts, this simple circuit should take a few hours at the weekend to construct.

The configuration of this antenna is a triangle with apex in the top of a very tall tree. The antenna is fed at a bottom corner using 450 ohm ladder line.

Log Search for 9M0L Log online

Anoka County Radio Club and Emergency Services

Interface APRS to a weather station

A Few facts concerning GMT, UT, and the RGO

Layman level explanations of "seemingly" mysterious LF MF and HF propagation occurrences.

Live audio of the National Hurricane Center’s Skywarn Nets. This live feed covers several different states, and locations throughout the US including: TX, LA, MS, AL, FL, GA, SC, NC, VA, MD, DE, PA, NJ, NY, CT, RI, MA, VT, and ME

Manually programming D-Star handheld transceivers like the _Icom ID-51A_ and _ID-31A_ can be a straightforward process, enabling operators to configure repeaters, simplex frequencies, and D-Star specific settings without relying on computer software. This method is particularly useful for field operations or when quick adjustments are needed, allowing hams to set up callsign routing, DR mode, and reflector links directly from the radio's interface. Understanding the menu structure and key sequences is crucial for efficient on-the-fly programming. Operators often find manual programming invaluable for activating new D-Star repeaters encountered during travel or for participating in local nets where specific G2 or G3 gateway configurations are required. While software like _CS-51_ offers convenience for bulk programming, the ability to manually input frequencies and D-Star parameters ensures operational flexibility. This approach also helps hams troubleshoot connectivity issues by verifying individual settings directly on the transceiver, ensuring proper D-Star registration and gateway access.

11 Years of monthly propagation reports from February 1988 to January 1999 by AD5Q

Steel City Amateur Radio Club Pittsburgh

VK9MT Online Log Search - Mellish Reef 2014

On this page are designs for Dual Band 2M / 70cm antennas. All antennas are 50 ohm designed driver. These Yagis have a unique element called a Open Sleeve. 4 Element 5 element and 9 element Dual Band - 2M / 70cm antenna projects

Mark Connelly, WA1ION article on Medium Frequency Amplifier Circuits in PDF format, include some RF amplifier schematics

Amateur radio, one of the older clubs of``the UK. Meets on friday nights. links to ATV.

Valcom Guelph specializes in the design and manufacturing of a full range of MF Beacon 100 KHz - 600 KHz, AM Broadcasting 540 - 1700 KHz, HF 1.8 - 30 MHz, VHF 30 - 300 MHz and UHF 300 - 1,200 MHz and SHF up to 6 GHz antennas based in Canada

Homebrewing dummy load by M0XPD

The advantage of 5/8 wave antenna is that it has the lowest angle of radiation and has about 1dB more gain when compared to 1/4 and 1/2 verticals. So the 5/8 should be the favourite choice for DX.

Local Amateur Radio Club for the City of Mount Vernon, Knox County and surrounding areas.

A no ground antenna solution for backpackers, balconies or plastic car bodies, like RV or other portables uses where is difficult to find a good counterpoise by PD7MAA

WR1B review of the Kenwood TS-570D on QST Jan 1997

A 220-ft tower that has five catenary lines, each about 500 feet long. Four of these lines, running NE, SE, SW, and NW support four 1/4-wavelength wire verticals used in a 160-meter four-square antenna.

A little information about my equipment, qsl cards etc.

Antenna modeling discussions about What happens if... a dipole is bent horizontally, laterally, vertically. Zig-zag, meander, catenary curve. Effect of sag, elevation, radials. OCF off-center feed, harmonics. Includes 4NEC2 antenna models for each study.

German antenna manufacturer, produces VHF and UHF antennas for amateur radio use

Used in the Kenwood TM-241, TM-741 2m module by W3KKC

This sweeper built for a narrow bandwidth filter adjustment, use a simple 555 version sawtooth wave generator.

All about stacking and matching yagi antennas.

Vintage radio equipment and memorabilia 1910 - 1950

An interesting article about planning and testing beverage antennas for 80 and 160 meters in a rural location

Hong Kong Amateur Radio Transmitting Society

A multiband trapped end-fed antenna can cover 20 30 40m bands. An option for portable sota operations were weight end simplicity are essential

Demonstrates a range of specialized radio frequency equipment and consulting services for amateur and professional applications. The offerings include _Vector-Finder_ direction finding antennas, various test equipment such as _gate dip meters_ and RF sniffers, and communications receiving adjuncts. Additionally, the company produces satellite antennas for weather satellite reception, voice amplification devices like the _Flex-Mike_, and custom prototype circuit boards. The company's product line addresses needs for precise RF measurement, signal detection, and specialized antenna systems, particularly for direction finding and satellite communications. Their historical association with National Radio (HRO) suggests a legacy in radio technology. The site also highlights a subsidiary, Sierra Mountain Products, which offers outdoor recreational gear, indicating a diversification beyond core RF manufacturing.

QRP Popular Frequencies, where to operate in QRP mode

Approximately 190–209 words of content are available, including previously unreleased **radio intercepts** from the Russian army during the Battle for Kyiv, with confirmed authenticity. The platform provides extensive news coverage, video reports, and analytical content focusing on Ukraine and international affairs, frequently publishing exclusive materials. Recent articles cover topics such as emergency power outages in Kyiv, discussions on Iran's nuclear program, and Belgium's policy regarding temporary protection for children born after Russia's full-scale invasion. The site also features in-depth investigations into Russian military losses, the political isolation of Hungary within the EU, and mental health advice for coping with wartime stress. Timely updates are provided throughout the day, detailing events such as drone incidents in Lithuania and proposed restrictions on military personnel's access to gambling in Ukraine. The platform offers a variety of multimedia content, including video and photo reports on events like the double explosion in Bucha and search operations for victims of the Volyn tragedy. Editorial selections delve into topics such as parliamentary elections in Slovenia, internal political conflicts in Ukraine, and the export of Ukrainian drones to the Middle East, alongside historical analyses and opinion pieces from various contributors, often featuring expert commentary and reader engagement. The content is primarily focused on current events and geopolitical analysis, with a strong emphasis on the **Ukrainian conflict**.

WA3KEY Virtual Collins Radio Museum. A complete resource for Collins Radio users, collectors and restorers.

Setting up a new antenna Mast for dipoles at VE3VN

Autocode makes a selection of fine morse code identifiers for commercial and amateur radio applications.

ECARA is a non-profit organization dedicated to the public service and promotion of amateur radio, and is affilated with the American Radio Relay League.

A complete guide to undestand and know how electret condensor microphone elements works by K3DAV

Ham radio shop in Hanstholm Denmark

Microhams is a dynamic organization of hams in the Puget Sound area. The club includes a broad range of people from our local tech industry who participate in just about every aspect of our hobby.