bullet Rudolf Hell: history and patents
bullet Hell Feldfernschreiber ("Feld Hell"):
bullet My Feld-Hell machine
bullet How it works
bullet Bandwidth
bullet Electronic circuitry and components
bullet Waffenamt and other markings
bullet The RV12P4000 tube
bullet Photos
bullet 3D photos
bullet Interfaces to a transceiver
bullet Maintenance
bullet Sounds from Hell
bullet Presentation (in work)
bullet Industry 1920-1945 (in work)
bullet Articles, literature, documentation
bullet Other Hellschreiber models:
bullet Hell 72b/c "GL", and Hell 73 "AGL"
bullet Hell-80
bullet Other Siemens Hellschreibers
bullet Hellschreiber radio receivers
bullet Hellschreibers from other manufacturers
bullet Modern "software" modes (FM, MT, etc.)
bullet Hell software & PC-interfacing:
bullet Hellschreiber software
bullet Soundcard interfacing
bullet My Hell WebCam
bullet Homebuilt Hell-printers:
bullet My Hell-printer
bullet Other homebuilts
bullet Hell/CW filter
bullet Paper tape, ink, felt ink rollers
bullet Links:
bullet Hellschreiber
bullet German 1930s-40s radio technology
bullet Frequencies, contests, nets, annual meeting, museums
bullet Send message to Frank / N4SPP
bullet Comments from visitors

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