The new BPSK125 and QPSK125 modes derive from BPSK31/QPSK31 but they are four time faster. The minimum ratio Signal-to-Noise ratio is about - 5 dB.
Creation :in 2003
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.
+Very High speeds
- Not used all that much
- not a comfortable speed for ragchewing
+ Can hanfle multipathing etc a little bit better than PSK31
- Signal to noise ratio is not as good as PSK31 this would mean you would require more power to get the same effect out of signal to noise ratio part of the performance.
+ This mode is ok for contesting but it is harder to make long distance hauls.
+ About the same signal to noise ratio as RTTY
FFT Screen Shot
Mode Audio Sample