Traduction anglaise.

is a Hellschreiber mode. The Hellschreiber modes FELD HELL, PSK HELL, FM HELL et HELL 80 are graphical modes where characters are drawn and the interpretation done by the user. For FELD HELL, the transmission is done by On-Off keying (OOK) as in CW, by BPSK for PSK HELL and by AFSK in HELL 80 and FM HELL (MSK in fact).

    This mode is included into the software MULTIPSK by Patrick F6CTE, there is the description of this mode and its variants as well as the specifications coming from his software :

Click on the copy of the screen in order to listen to the corresponding audio signal.

Createad by : Nino Porcino (IZ8BLY) and Murray Greenman (ZL1BPU)
Description :
Baud rate :
105 or 245 (only 245 bauds on Multipsk)
Matrix :
for PSK HELL 105 bauds…height: 6 pixels and width: 7 pixels
              for PSK HELL 245 bauds…height: 7 pixels and width: 14 pixels
Speed :
25 wpm
Modulation :
Receive mode :
indifferent (USB or LSB)
Character set :
all ASCII printable characters except small letters, carriage return (+ line feed) and error correction character. The used font (FeldHell) is derived from the font of G3PLX (Peter Martinez),
Shape of pulse :
raised cosine profile
Bandwidth :
about 170 Hz for 105 bauds and 400 Hz for 245 bauds,
Synchronization :
no need, each column is displayed vertically 2 times (but transmitted once)
Pmean/Ppeak :
Lowest S/N :
- 10 dB for 245 bauds mode
Note: pieces of information about Hellschreiber modes can be found on the WEB site of ZL1BPU (Murray Greenman). Pascal F1ULT make a french translation of ZL1BPU's site on

Recommanded frequencies for PSK HELL (USB)
Valid also for FELD HELL, FM HELL and HELL 80.
3580, 7035, 10135, 14063, 21063 and 28063 KHz

Back to the list of modes included in MULTIPSK