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A 10-20 meters coverage delta loop antenna. After relocating, DL2HCB designed a multiband loop antenna to cover 10-20m with an open-wire feed for impedance matching and compact installation. Inspired by the mini-X-Q design, a modified 10m delta-loop was built, enhanced with a 1/4 wave shorted stub for 28 MHz using 450-ohm ladder line. The antenna delivers east-west broadside radiation and performs as a closed loop on other bands. Operational tests yielded strong European signals and successful DX contacts, including a 20m QRP QSO with FY/DJ0PJ.

Locate in the Silicon Valley, the DNJ Radio is dedicated to delivering Ham radio and CB radio equipments to the enthusiasts around the world.

This document details the design and construction of the PA70H, a 50-watt RF amplifier for the 70MHz (4-meter) amateur radio band. Built around the Mitsubishi RD70HVF1 MOSFET transistor, the amplifier delivers 45-55W output with 3-5W input power while operating on 13.8V DC at approximately 7-8A. The PCB design incorporates multiple protection circuits including overcurrent, SWR, and temperature control. The amplifier features various control modes including GND PTT, +13.8V PTT, and RF VOX. Two versions are available: PA70HLI (requiring 100mW input with additional driver) and PA70H (for 3-5W input). The comprehensive documentation includes circuit diagrams, assembly instructions, and performance data showing successful operation from both 100mW and 3.5W input sources.

National Communications Magazine is a subscription-based weekly publication on Substack, focusing on scanner radios, CB radio, GMRS, FRS, and MURS. Transitioning from print to an online PDF format in 2012 and to Substack in April 2023, it delivers timely content for radio enthusiasts. Edited and published by Chuck Gysi, the magazine provides in-depth coverage and updates across diverse communication services.

New Alfa Alfa Worldwide Radio DX Group Are Welcome, Also old Alfa Alfa members. Only Active Operators and SWL ShortWaveListers PostStation. You Make the Difference Whether You Are a CB Operator. Or just a Listener without a transmitter. And actively participates in the Alfa Alfa Worldwide Radio Dx Group. This keeps the Group Active and makes a difference compared to other sleeping club / group members. They are called spirit callings that are never heard or received by SWL qsl. You as Alfa Alfa Makes a difference and a group alive. Alfa Alfa Worldwide Radio Dx Group is looking for real, very active CB radio operators, and SWL ShortwaveListing Post Stations