Ham radio toolkit

Bands — type a frequency (MHz by default, or add kHz) to see:

The tables below the answer list every band, with the row for your frequency highlighted. UK power limits by licence class are shown; for the band-by-band UK detail follow the link to Ofcom’s licence schedule.

Callsign — finds the DXCC entity, continent, CQ and ITU zones, and UTC offset from the prefix, and spells the call phonetically. Portable calls work both ways round (EA8/G4ABC is in the Canary Islands, W1AW/KH6 in Hawaii); /P, /M, and /QRP are ignored, and /MM is maritime mobile. Enter your own locator to get the beam heading.

Locator and distance — converts between latitude and longitude and Maidenhead locators of 4 to 10 characters, and gives the great-circle distance and bearings, short path and long path. The azimuthal map is centred on you: the line points along the beam heading and its length is the distance.

Repeaters and tones — gives the input frequency for a repeater output using the usual US and European offsets, and lists the 50 standard CTCSS tones and 104 DCS codes. Reference has the ITU phonetic alphabet, Q-codes, RST, prosigns, and common CW abbreviations.

Related: antennas designs dipoles, verticals and Yagis for a band and checks their harmonics against the band plans, feedline works out SWR and coax loss, and RF filters designs low-pass filters for harmonics. The RF calculator works out path loss, decibels converts dB, dBm and S-units, inductors winds coils, and the audio scope generates and measures tones. Learn and decode CW with Morse code, and track the ISS and other amateur satellites with satellite passes. Listen with the SDR receiver, decode FT8, PSK31, RTTY and SSTV with digital modes, and keep a log, watch the greyline and band conditions, and map APRS with propagation & logbook.