New release of MULTIPSK 4.45.6 #Multipsk

Patrick Lindecker

New release of MULTIPSK (4.45.6)


Pour les francophones: la version en français de ce message se trouve sur mon site ( Il suffit de cliquer sur le lien "Principales modifications (courriel avertissant de la sortie de la nouvelle version)".

Hello to all Ham and SWL,


The new release of MultiPSK (4.45.6) is on my Web site (
The mirror site is Earl's, W8BR:

The MD5 signature of the downloaded MULTIPSK_setup.exe file to, possibly, check (with WinMD5 for example), that the downloading works without error, is equal to:


Multipsk associated to Clock are freeware programs but with functions submitted to a licence (by user key).


The improvements of MULTIPSK 4.45.6 are the following:


·                     Replacement of the EM (Extended Message) sub-mode by the new EM mode

The EM mode is more reliable and a bit more sensitive than the former EM sub-mode (deleted in this new Multipsk version and not compatible with the new EM mode).


Its main use is to give the possibility to have simultaneous QSO (at standard speed similar to the PSK31 one) between different Hams, as messages are displayed on the waterfall and on the reception windows.

For more details, EM specifications Version 2 are given here:


Example of an EM « CQ » message displayed on the waterfall.

So everyone can see these messages and possibly answer. The number of QSO is limited only by the bandwidth.


A channel of about 400 Hz on the waterfall seems reasonable to display the message. So 6 QSO in a standard phone bandwidth (2500 Hz) will be nice, each QSO being visible by everybody.
Now, the maximum theoretical number of QSO would be around 2500/172=14 (172 Hz being the transmission bandwidth).


The sensitivity (minimum Signal to Noise ratio) is equal to -15,5 dB (with the first decodings at -18 dB), which is better that BPSK31 and Olivia and comparable to MFSK8.


With the EM, it is possible to send messages by blocks of 47 characters maximum each. A big message will be automatically split in blocks of 47 characters, sent one after the other.


The proposed main frequency for EM is 7055 KHz (USB), and the other proposed frequencies are: 3576, 10142, 14078, 21085, 28100 (USB), 144620 KHz (FM).
To concentrate EM calls, make them, preferably, for the 5 five minutes of the hour (for example from 20:00 to 20:05).


Example of 3 test EM messages displayed on the specific panel (RX) of the EM

window and on the waterfall.


·         Function "Ham calls with Multipsk"
This function gives the possibility to send your CQs to the "Ham calls with Multipsk" website (""), where other users will see your CQs and possibly your position (localizable on a map), this to facilitate a possible answer from another Ham.
This possibility concerns almost all the TX modes of Multipsk, and especially exotic modes (ALE400 /FAE, AUTEX, EM...)
To start this function, click on the "Ham calls" option of the menu located on the top line of the Multipsk RX/TX window.




·         Addition of the "PKT" (or "DATA-L"), "PKT-R" (or "DATA-R") modulations in the "QRGs" (i.e. "Frequencies") window. This modification is associated with the "FREQUENCIES.TXT" file, where modes with their frequencies and modulations are specified.

·         Thanks to Ralf (DO5RBB), the new server is available.
So the former "" and "" servers are replaced by this new server. This replacement is automatically done in Multipsk.

The list of WEB sites associated with the "Traffic" window ("Traffic" button) is:



GMDSS + ATIS                      

ACARS (VHF)                         

HFDL (HF ACARS)                 


M10/M20, DFM, RS41, LMS6 (radiosondes)


Ham calls with Multipsk” (« CQ ») 

Note about translation of Multipsk.exe and Clock .exe:  the 4.45.5 version of Multipsk has been translated to Spanish by Joachin (EB4Z), from French.