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Olivia, Feld Hell, and SSTV Modes

DIGITAL Section

*NOTE: This OLIVIA info is provided by NW7US and the Olivia Digital Mode on HF Radio (Contestia included) group on Facebook and on Groups.io (via http://OliviaDigitalMode.org).

Olivia Digital Mode Radioteletype on HF Olivia@groups.io

About the Olivia MFSK Digital Mode

Introduction

Olivia MFSK is an amateur radioteletype protocol designed to work in difficult (low signal-to-noise ratio plus multipath) propagation conditions on shortwave radio (i.e., high-frequency, or HF) bands. The typical Olivia signal is decoded when the amplitude of the noise is over ten times that of the digital signal! It is commonly used by amateur radio operators to reliably transmit ASCII characters over noisy channels (slices of high-frequency–3 to 30 MHz, HF–spectrum) exhibiting significant fading and propagation phasing.


HELLSCHRIEBER DIGITAL MODE on FeldHellClub@groups.io

About the FELD-HELL Digital Mode

HELLSCHREIBER

Most digital communications modes are intended to be read by a mechanical or electronic machine. There are however a few machine generated communication modes intended to be human readable. These include Morse, FAX, SSTV and NBTV. These pages are dedicated to the least known of visual human readable modes, the Hell family.

Hellschreiber describes a method of sending text by radio or telephone line, that involves dividing each text character into little pieces, then sending these digitally. Hellschreiber is a German name, meaning “bright writing”, or “clear writing”, and may be a pun on the name of the inventor, Rudolf Hell, who patented Hellschreiber in 1929.

The first major application of Hellschreiber was transmission of text for newspapers by telephone line in the years before World War II. Hell’s invention was thus the world’s first widely used and practical facsimile machine. War-time machines were more portable, and intended for use with field telephones and radio equipment.Later, Hell page printers were developed.

Print from a wartime mechanical Hellschreiber
Print from a wartime mechanical Hellschreiber

The traditional method of sending Hellschreiber by radio is to key a Morse-type (CW) transmitter ON for every black spot in a text character,and OFF for every white place. Different parts of each character are sent at different times. The technique is still in use by interested Amateurs, communicating world-wide. This mode is now called Feld-Hell (Field-Hell), since the pre-war format still used was originally used for field communications by the German Army. Feld-Hell offered good immunity to interference and provided a clandestine transmission capability, because nothing was transmitted until a key was pressed. Commercial variations of Feld-Hell could still be heard occasionally on HF up until the 1980s, transmitting Chinese and Korean characters.


G3PLX working PA3BQS in Feld-Hell

After Radio teletype took over on HF, Hellschreiber was almost completely lost and forgotten, but for a group of dedicated German and Dutch Amateurs who restored and used war-time equipment, and ultimately it was popularized by significant software developments in the 1980s and 1990s.

 

Where can I find Hell signals?
In general, here is where you’ll find most Hell activity.  As with any ham radio mode, these are suggested frequencies but not etched in stone, so please listen first before transmitting, as you’re also likely to hear MFSK, Olivia, BPSK, JT65, and other digital modes on or near these frequencies. Also, check https://hamspots.net/ for current activity.   160 METERS 1.843 to 1.844 (FT8 took over our existing frequency at 1.840)
  80 METERS 3.578 to 3.584 (FT8 took over our existing frequency at 3.573)
  40 METERS 7.080 to 7.086
  30 METERS 10.137 10.144 (Region I)
  20 METERS 14.063 (PREFERRED), 14.073 (Note 1)
  17 METERS 18.105
  15 METERS 21.063 
  12 METERS 24.924
  10 METERS 28.063
    6 METERS 50.286

Note 1: For 20 meter ops, the FHC calling frequency is 14.063 and UP to 14.069. PSK31 ops are on 14.070 and the QRP club uses 14.060 as their calling frequency. We do not wish to cause interference to each other. A reminder, QRP is a power reference, not a mode. If using 14.073, be sure to avoid interference with the JT65 or FT8 area. Even though some may encroach on our segment, we need to be be the good guys!

About

Licensed since 1977

Novice-1977;  General-1978;  Advanced-1988;   20wpm Extra-1988

Formerly: WD9DSS, KE9MN, WD9T & DA1UZ

Station photos circa 1980

Blog

Feld-Hell Digital Mode

Feld-Hell Digital Mode on FeldHellClub@groups.io What is Hellschreiber? Hellschreiber, or Hell, is a method of sending and receiving text using facsimile technology.  It is unique in that the characters are not decoded, but “painted” or printed on a screen.  There are several modes of Hellschreiber, the most popular being a single-tone version call Feld-Hell, an …

OLIVIA DIGITAL MODE

Olivia Digital Mode Radioteletype on HF Olivia@groups.io NOTE: This info is provided by NW7US and the Olivia Digital Mode on HF Radio (Contestia included) group on Facebook and on Groups.io (via http://OliviaDigitalMode.org). It is provided as Educational purposes only. About the Olivia MFSK Digital Mode Introduction Olivia MFSK is an amateur radioteletype protocol designed to …

Contact

Voice Contact Info:

HF-7.258 MidCars

VHF 145.230 Mhz

UHF 444.250 Mhz

DMR Illinois-Link (31171)

PGP Public Key: 0x28571C433AEB2659

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