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.
Questions about the phone modes, most commonly SSB on HF and FM on VHF/UHF, but also including DSB-SC, PM, or AM.
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…
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
an emergency preparedness/ contest run by ARRL in the United States and Canada the last full weekend of June each year.
for questions relevant to vacuum tubes, also known as thermionic valves or simply valves.
Questions related to writing software (programming) for Amateur Radio purposes.
Questions specific to rules, regulations, and practices in European countries.
Questions regarding the modification of existing radio equipment to add features or improve performace
Questions relating to determining your location or the location of a QSO based on one of the various systems of measurement (lat/lon, GPS coordinates, ARRL section, CQ Zones, ITU Zones, Maidenhead Gri…
for questions relating to protection of equipment from undesired external inputs such as overvoltages, RF coupling, and other potentially damaging inputs.
the frequency range 3-30 kHz.
Questions about shortwave listening and similar low-frequency reception activities.
Questions about the practice of, and legal requirement to, identify your transmissions using your call sign.