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 : 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
This mode is super fast , it should only be used when conditions are strong inbetween stations , the lower Signal to noise ratio is not as good as BPSK63 or QPSK 63 with about a 2 db penalty , this is a trade off for speed, but if you are needing to send lots of text for example this might be a mode to consider like Bullentins etc. With a average speed of 176 wpm , this would be a good choice to use when you need speed. But propagation dictates how well the other stations can decode the mode.