Inside DXZoneBest Links of the Week Top Amateur Radio Websites – Issue 2236 A selection of best links, recently added to our amateur radio links directory By DXZone - Oct 30, 2022 974 Amateur Radio License Map HamInfo Use this map to find amateur radio license holders in the USA. 80m Vertical dj0ip This is a FULL SIZE quarter-wavelength vertical made on a 18m Spiderbeam fiberglass telescoping Spiderpole RF Exposure Calculator K7LWH To use the RF Exposure Calculator, fill-in the form with your operating power, antenna gain, and the operating frequency. Depending on how far above ground the RF source is located, you might want to consider ground reflections too. Demonstrating AM sidebands PA3FWM Amateur radio courses teach that in amplitude modulation, sidebands arise. This can be proven mathematically, and nowadays with an SDR one can easily see them. Retevis RT3 Tytera MD-380 Modifications DL4YHF Collection of modifications for the Retevis RT3, a monoband handheld transceiver for DMR (digital voice) and analog FM. It is almost identical to the Tytera MD-380. Automated Voice announcements over RF VE6lk Automated voice announcements project built to have an automated way to deliver club announcements via the repeater network. ARRL Exam Review for Ham Radio ARRL Online browser-based resource for your computer, tablet or other mobile device. Use this review and practice exam resource with the current editions of ARRL License Manuals.