PSK220F
Traduction anglaise.
The PSK220F mode is a PSK63F mode carried to a 220
bauds speed. It allows a very rapid transmission speed. The minimum ratio
Signal-to-Noise ratio is about - 7 dB.
Click on the copy of the screen in order to
listen to the corresponding audio
signal.
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 :
Créateur : Patrick
Lindecker F6CTE (2005)
Description :
Baud rate : 220.5
Speed : 140 wpm in capital letters and 200 wpm in small letters (average)
Modulation : DBPSK
Reception mode : indifferent (LSB or USB)
Character set :
ASCII characters + almost all ANSI extended characters + an error reset
character (« Varicode » characters)
Shape of pulse : raised cosine
Bandwidth : about 430 Hz (max - 30 dB),
Synchronization : automatic using the signal
Correction code : no
Convolution code : R(Rate)=1/2, K (Constraint length)=7 with Viterbi type decoder, both coder outputs being sent successively,
Drift tolerance : 2.5 Hz/sec (+/- depending on signal-to-noise ratio)
Pmean/Ppeak : 0.79
Lowest S/N : - 7 dB in text and -5 dB in DIGISSTV
Interleaving : no
Note: this mode is simply PSK63F (of Nino Porcino IZ8BLY) carried to 220.5 bauds.
Recommanded
frequencies for PSK220F
+DIGISSTV "Run" (USB)
Patrick F6CTE proposes to focus calls at the following frequencies and times :
* 14075 Khz (AF around 1000 Hz), at 17h00 UTC if few traffic,
* 10148 kHz (AF around 1000 Hz), at 22h00 UTC if few traffic,
* 144620 kHz (AF around 1000 Hz), at 20h00 UTC if few traffic.
