Multipsk 4.38 - Test version 2 - "Extended Message" pseudo-mode to test #Multipsk
Hello to all,
I proposed a pseudo-mode called “Extended Message”, in this test version 2:
Paste this address in your Internet Explorer or equivalent. Download the file.
You can also simply extract this ZIP file in a test directory (C:\TEST for example) and start Multipsk.exe.
Once Multipsk started up, the user clicks on the buttons « RX/TX screen » and then "EM RX/TX" (yellow button in the upper part). The user types his/her message in the first editor on top of the small window, then types the <Enter> key once the message ready to be transmitted.
The answer is waited on the waterfall and so on. Macros can be used.
Frequencies for test
The following frequencies are suggested for the test: 3590, 7042, 10148, 14075, 144620 kHz, in USB.
Quick description of EM
The EM (Extended Message) is a “pseudo-mode” because it can be used in parallel of any mode (BPSK31...).
So everyone can see these messages and possibly answer. This system can be used for a small meeting. The number of participants is limited only by the bandwidth.
The sensitivity (minimum Signal to Noise ratio) is -14 dB comparable to Olivia or MFSK16, at 47 wpm max.
Example of an EM « CQ » message displayed on the waterfall.
As soon as an EM is received, Multipsk:
This identifier is transmitted in 3.7 to 9.9 sec and has a bandwidth of 172 Hz. It is composed of a detection code followed by a sequence of data inside a Reed Solomon frame.
To authorize the reception and transmission of these messages, one must click the "EM RX/TX" button.
It is a free error transmission, i.e in presence of an EM message, there are two solutions:
EM specifications (project) are integrated in the ZIP file.
Thanks to post your observations or reports on the group IO.