On Tuesday, 21 April, the RSGB 1.3GHz UK Activity Contest runs from 1900 to 2130UTC.
Using all modes on the 23cm band, the exchange is signal report, serial number and locator.
On Wednesday, 22 April, the RSGB 80m Club Championship runs from 1900 to 2030UTC.
Using SSB on the 80m band, the exchange is signal report and serial number.
The United Kingdom and Ireland Contest Club DX CW Contest starts at 1200UTC on Saturday, 25 April, and ends at 1200UTC on Sunday, 26 April.
Using CW on the 80 to 10m bands, where contests are permitted, the exchange is signal report and serial number.
Full rules, including UK and EI area codes, are available via tinyurl.com/ukeiccrules
The SP DX RTTY Contest starts at 1200UTC on Saturday, 25 April and runs until 1200UTC on Sunday, 26 April.
Using RTTY on the 80 to 10m bands, where contests are permitted, the exchange is signal report and serial number.
Polish stations also send their province code.
On Sunday, 26 April, the UK Microwave Group EHF Band Contest runs from 0800 to 2000UTC.
Using all modes on 76 to 241GHz frequencies, the exchange is signal report, serial number and locator.
Also on Sunday, 26 April, the British Amateur Radio Teledata Group Sprint 25 Contest runs from 1700 to 2100UTC.
Using 75 baud RTTY on the 80 to 10m bands, where contests are permitted, the exchange is your six-character locator.
