Creative Commons Attribution-Share Alike 4.0 truetrue English Massie Wireless Station spark gap transmitter author name string: Michael L. Umbricht Wikimedia...
Attribution 4.0 truetrue English Recording of recreated transmission of Massie Wireless Station "PJ" sending "CQ DE PJ" as done by Dr. John S. Belrose...
DescriptionSmall spark gap transmitter.jpg English: Photo of a small spark-gap transmitter, an early type of radio transmitter used during the wireless...
