A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
in the United States an unlicensed radio service operating on 27 MHz.
for questions relating specifically to the amateur radio UHF allocation around 430 MHz.
Questions about the phone modes, most commonly SSB on HF and FM on VHF/UHF, but also including DSB-SC, PM, or AM.
Questions specific to rules, regulations, and practices in European countries.
Questions specific to rules, regulations, and practices in Canada.
Questions related to writing software (programming) for Amateur Radio purposes.
Questions about the surface of the Earth as it affects radio propagation and antenna system design and installation. For questions about RF grounds and shields, counterpoises, virtual grounds, etc. us…
Satellite navigation systems, including GPS. Questions should be related either to amateur radio operations (e.g. APRS tracking) or the theory of positioning using radio signals; questions merely abou…
for questions relevant to vacuum tubes, also known as thermionic valves or simply valves.
an emergency preparedness/ contest run by ARRL in the United States and Canada the last full weekend of June each year.
Questions about low-noise amplifiers (LNAs) and their application in receiving antenna systems.
for questions that relate to the efficiency of a system or a component. The efficiency is the amount of useful work performed by the system or component (in radio applications, typically …
Signal to Noise Ratio - any questions about improving or detecting an SNR or lowering your noise floor.
American Radio Relay League (ARRL), the largest association of amateur radio enthusiasts in the USA
Questions regarding the modification of existing radio equipment to add features or improve performace
Controlling a transceiver using software running on a separate personal computer. See also: [software-defined-radio], [audio-interface].
Questions about the practice of, and legal requirement to, identify your transmissions using your call sign.
the frequency range 3-30 kHz.
Questions about shortwave listening and similar low-frequency reception activities.