Click here for THE authoritative website of the "Foundation for German communication and related technologies (History of Technology)", where Arthur Bauer (PAØAOB) has collected and organized an incredible amount of information on the fascinating (and often superior) German communication and related technologies of the 1930s and 1940s.

German WW2 radio communication equipment page here & here of Jan-Martin LA8AK (SK)

WWII radio page of LA6NCA

"German World War II communications receivers; Parts I-IV" (Hellschreiber on pp. 1-3), Dick Rollema, PA0SE, CQ Magazine, 8/1980, 12/1980, 5/1981, 8/1981

“Enigma", [incl. PA0AOB Hellschreiber] D.W. Rollema (PA0SE), Wireless World, Vol. 89, Nr. 1569, June 1983, p. 49-54 

"The significance of German electronic engineering in the 1930s" by Arthur Bauer, PA0AOB, presented at the 2004 IEEE Conference on the History of Electronics (CHE2004), Bletchley Park, UK, June 2004.

"Receiver and Transmitter Development in Germany 1920-1945", by Arthur Bauer, PA0AOB, IEE Int'l Conf. on 100 Years of Radio, London, September 1994

"The Fusprech.f Transceiver - a forerunner to today's compact transceiver", by Bengt Lundgren, SM5GDQ, CQ Magazine, October 1990

"The Torn.E.b - The German Portable Battery Receiver Type 24b-305", by R.T. Walker, G4PRI, Radio Bygones, April/May 2003
 

"Deflating British radar myths of World War II", Maj. G.C. Clark, Air Command and Staff College Research Dept, AU/ACSC/0609F/97-3

"German Radio Communication Equipment", US War Department Technical Manual, TME 11-227, June 1944

"Radar Origins Worldwide: History of Its Evolution in 13 Nations Through World War II", R.C. Watson, Trafford Publishing, 2009 , 420 pp.

IZ8BLY, Nino Porcino (who created the IZ8BLY Hellschreiber software for PCs in cooperation with Murray Greenman, ZL1BPU).

SM6MOJ, Andrew Lovell's web site with lots of Hellschreiber literature in various languages (incl. those listed above).

Association of Friends and Supporters "Technical Collection Dr.-Ing. Rudolf Hell" in Kiel/Germany .

 ZL1BPU, Murray Greenman - link removed upon request from Murray.

The website of the Feld Hell Club is here. I'm member number 24.

Feld Hell Club Offical Yahoo Group

Feldfernschreiber Owners & Operators Group (FOOG). I'm member number 1 (hi!)

Here is the (small) Hellschreiber page in Wikipedia.

Here is the (small) Hellschreiber page of Ottar, LA9IHA

Here is the (small) Hellschreiber page of Marius at HF-FAX (under construction, October 2008); his overview of tape-fax history is here.
 

Data (digi) Mode spot page (including "Hell") by Risto, W6RK