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My first hint that DL9DX was used before me was during a contest. “DL9DX, 59, 123, thank you Hermann”. Well, my Name is not Hermann. I got that a couple of times after that. So I start to dig about the histors of my callsign. At first I found the website of DOK R10, a radioclub in Mönchengladbach, west germany. On their history page DL9DX (OM Stammen) was mentioned as one of the founders of the radioclub there after the war in 1948.
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