PSK10 mode is designed to assure
communications with weak ratio Signal-to-Noise ratios down to -17.5 dB with
less than 2% errors. The speed is 18 wpm. This mode is very sensitive to the
ionospheric Doppler modulation.
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 :
Created by: Patrick Lindecker F6CTE (2001)
Baud rate : 10
Speed : 18 wpm
Modulation : DBPSK
Reception mode : indifferent (LSB or USB)
Character set :
56 "Varicode" characters " A..Z 0..9 <CR> <ESPACE> .
, " : - = + ? $ ' ( ) ! / @ & # * with an error reset
character and an idle character (displayed by ">").
Small characters are transformed in capital characters and special characters as
" é " are transformed in standard capital (in the example above: " E ").
Shape of pulse :
rectangular but the transition between 2 successive different bits is
done by a
decreasing sine then by an increasing sine (each one during a quarter
Bandwidth : about 40 Hz
Demodulation : coherent,
Synchronization : automatic using the signal
Correction code : no
Convolution code : no
Interleaving : no
Repetition : no
Drift tolerance : 40 Hz/mn (depending on signal-to-noise ratio)
Pmean/Ppeak : 0.86
Lowest S/N : -17.5 dB
For precise specifications about PSK10, see the PSK10.DOC file.
Recommanded frequencies for PSK10 (USB)
modes (expect PSK220F) like PSK10 as well as PSKFEC31, PSK63F +DIGISSTV
"Run", PSKAM10/31/50 are QRP transmissions and they are used very
little, Patrick F6CTE proposes to focus calls at the following
frequencies and times :
* 14075 Khz USB (AF around 1000 Hz) at 17h00
* 10148 kHz USB (AF around 1000 Hz) at 22h00
* 144620 kHz USB (AF around 1000 Hz) at 20h00
A CW prefix, at 12 or 20 wpm, indicating mode,
software and power used, for example: "VVV DE F6CTE / MODE PSK10 / SOFT MULTIPSK / PWR: 5 WATTS" could be transmitted before the CQ call itself. The option of the video
identifier of mode, now
included in MULTIPSK, permits to
specify visually in CMT Hell the mode label (and/or other information) before
the main transmission. This identifier will be visible in the "waterfall" of the
other Ham. For example, just before the general call ("CQ") in PSK10, it will be sent automatically "PSK63F" in
CMT Hell. The other Ham will see "PSK63F" displaying
on his "waterfall" and will switch immediately to PSK10.