The historic VLF transmitter at Grimeton Radio Station in Sweden is celebrating one hundred years since it was put into commercial operation. The unique Alexanderson alternator operates using callsign SAQ. To mark the centenary a special transmission will take place at 1000UTC on Sunday 1 December using CW on 17.2kHz. The event will be livestreamed on the organisation’s YouTube Channel using the handle @AlexanderSAQ. You can find out more about the event via the website