Pieter-Tjerk de Boer PA3FWM Contributions at Pi and Radio 2022 (UKW-Tagung Weinheim) Ein Glasfaser-SDR (Talk) Contributions at Pi and Radio 2019 (UKW-Tagung Weinheim) Zeitübertragung im Langwellenbereich, insbesondere mittels LORAN-C (Talk)