The Kalmit Transmitter is used to broadcast the RPR1 103.6 MHz and BigFM 106.7 MHz radio stations. Amateur radio hams also use the height and location of the Kalmit. A branch of the German Amateur Radio Club, Ortsverband Z22, erected a relay station on the summit with the call sign, DB0XK, which was authorized on 30 November 1971 by the present-day Federal Network Agency with a frequency of 145.700 MHz. The amateur radio relay is housed in the tower next to the Kalmithaus.