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This sweeper built for a narrow bandwidth filter adjustment, use a simple 555 version sawtooth wave generator. -
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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 30 Meter Quarter Wave DIY Ground Plane Antenna that loads up nicely also on 12 and 6 meters -
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. -
Two coupled PAs with each 2 times 2C39 deliver around 400W RF. -
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Autocode makes a selection of fine morse code identifiers for commercial and amateur radio applications. -
A complete guide to undestand and know how electret condensor microphone elements works by K3DAV -
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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. -
Analysis of N3UJJ installed antennas using the AIM4170b Antenna Analyzer -
A freeware windows antenna design and modelling software developed by an amateur radio operators primarily intended for VHF yagi aerials. -
The CWJF CW Club website is a resource for Morse code radio enthusiasts in Juiz de Fora, Brazil. It provides information about the club, its activities, and contact details for those interested in joining. The site also includes news updates and event announcements for members and visitors. -
Fla keys amateur radio club - kb4gcz -
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MFJ-264 dummy load restoration by VE3LNY -
SWR is Finland's first private shortwave station. -
Homepage Of The Big Time Operators CB Club Based In Muncie Indiana USA -
Blue Mountains Amateur Radio Club located in the Blue Mountains west of Sydney. Resources and Information for members and all radio amateurs. -
Discussion groups for Shortwave Listening, Propagation, Amateur Radio, and related topics. -
A portable swiss quad antenna project made with components and parts that can be dismounted, in German -
Based in Virginia USA, offer repearing services for amateur radio equipment and related accessories -
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Distributor of ESD, kapton tapes, high temperature tapes, esd wrist straps, ionizers, ground cords, grounding devices, ESD gloves, esd finger cots, esd workstations, esd rubber bands, esd binders, esd bags, anti static glove, esd rubber bands, no clean solder paste, water soluble solder paste, finger cots, esd mats -
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An home made end fed half wave antenna with a tuner box by NG0R -
PDF File of the IC R7100 communication receiver service manual -
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The Triple-M-beam calculation program is used for the calculation of Triple-M-beam antennas by DG0KW -
Carolina Cyclone series of mobile antennas -
An operating stand out of wood for the FT-817 -
Web page by SV2BZQ about aprs, and weather in Greece. -
The range and coverage of your VHF transceiver will be limited to your radio horizon. How to calculate the visual horizon and how to determine the Radio Horizon -
This simple antenna modelling windows software by F5IMV wil calculate a dipole,extended double Zepp,G5RV, ZS6BKW and many other wire antennas by F5IMV -
This test circuit is easy to duplicate, and demonstrates the extreme voltages that appear in an amplifier when the load is improper for the amount of drive power applied. -
Products and books for the radio hobbist. Antennas, Coax cables, filters,Lightning Protection, Wire & Cable, Books -
Stacking principles, with homebrew coax- and power-splitters by DK7ZB -
Page dedicated to the Yaesu FT-920 -
100 W output RF amplifier for 10 meter band project by W4NFR -
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On line shop in Greece for amateur radio products, electronics, DAB Radio and GPS. Dealer for popular amateur radio brands, heil sound, kenwood, MFJ and more -
