KNX began as experimental station 6ADZ on the 10th September 1920.
The QSL letter was received during the time when KNX was operating on 285.5 metres (1050 kHz) with a power of 5000 watts (Nov 1928 until Nov 1932 - On October 2nd , 1928, KNX increased power from 500 watts to 5000 watts. During the following month on November 11th, the station moved from 337 metres (890 kHz) to 285.5 metres (1050 kHz).
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