What modern Amateur Radio soundcard “Digital Mode” is nearly 80 years old?
What Amateur Radio soundcard “Digital Mode” is really analog?
What Amateur Radio soundcard mode was adopted by the WWII Axis Forces?
Dr Rudolph Hell’s “Hellschreiber” is that mode!
First we should make it clear that “Hell” was the good Dr’s surname, and that in Dr Hell’s German language it is a play on words of sort, translating as “Brightly.”
So it is NOT a cussword in this use, nor does it have any real meaning beyond Dr Hell’s name.
Hellschreiber sould be thought as related to the technology of a Fax machine. The message to be sent is “scanned” using a matrix or grid, much like making a halftone from a photograph for printing, and each spot in the grid is declared as either Black or White in an analog transmission.
Here is an example of Seven and Twelve High Grid formats for Feldhellschriber (Field Hell Writer):
Dr Hell’s orginal prototype from the 1920’s seemed to have more to do with a Ticker Tape machine than anything else:
This original machine used Carbon Paper (kohlepapier) and a “striker” to tap the printout tape (called Registreirstreissen in the drawing):
The German Army gear was later refined for commercial use:
Now we run Hellschreiber over Amateur Radio Bands using soundcard software:
A good list of Hellschreiber References is:
http://feldhellclub.org/ is the premier Hellschreiber Club – K9ZW is FH #169 (there are over 650 members).
K9ZW (FH 169)