PSK125 et QPSK125
Traduction anglaise.
The new BPSK63 and QPSK63 modes derive from BPSK31/QPSK31 but they are four time faster. The minimum ratio Signal-to-Noise ratio is about - 5 dB.
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.
Creation : in 2003
Description :
Baud rate : 125
Speed : 148 wpm in capital letters and 204 wpm in small letters (average)
Bandwidth : about 320 Hz,
Drift tolerance : 120 Hz/min in BPSK125 and 40 Hz/min in QPSK125 (depending on level)
Lowest S/N : -5 dB
Note: for the remainder, except the secondary channel, the characteristics are identical to the ones of BPSK31/QPSK31 modes.
The "secondary channel" specific to Multipsk
There are two sets of characters among 256 ASCII and ANSI characters:
* a first set of 193 characters (the primary table) is used for the current exchanges,
* a second set of 62 characters (the secondary table") is used to send
automatically, in a continue and repetitive way, the following pieces
of information "Call", "Name", "Locator", QTH during which nothing is
sent, the QSO being in progress. It is a sort of "intelligent
idling". These characters are displayed in a little window.
The idling character, if nothing can be sent, is the character CHR(0).
This secondary channel is interesting because the flow of characters in
these modes is very superior to the typing speed. It will permit to
Hams listening to rapidly have essential information between typed
characters.
See the document "Characters to manage for secondary text on DominoEX
FEC, PSK63 and PSK125.doc" on my WEB site ("Specifications") for
details.
BPSK125 and QPSK125
(USB)
1838, 3580, 7035, 10140, 14070, 18100, 21080, 24920, 28070, 28120, 50000, 144000
(144605 in France and 144144 in Italy).