New release of MULTIPSK (4.44) - LRPT #Multipsk

Patrick Lindecker

New release of MULTIPSK (4.44)


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 (4.44) 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 main improvement of MULTIPSK 4.44 is the following:


LRPT demodulation

The LRPT ("Low Rate Picture Tranmission") mode associated with the Russian satellite METEOR-M2 is a digital mode allowing transmission of satellites pictures of Earth, in VHF (137.1 MHz), with a better resolution than the ones transmitted in the analog APT mode.

For Hams and SWL, the LRPT signal must be received on a SdR receiver (FunCube Dongle Pro+, RTL SDR or SDRplay) in interface with Multipsk. The signal will be directly demodulated by Multipsk. The file result of this demodulation will be transmitted to the M2_LRPT_Decoder.exe program which will make the decoding and will extract the pictures.

Multipsk can also interface a VAC (Virtual Audio Cable) which would carry IQ data at 196 kHz / 16 bits / stereo, from a SdR application (for example SDRUno) itself in reception of a SDR receiver.


This mode is in freeware, so without time limitation.

However the (not indispensable) auxiliary function of playing/recording of WAV files in LRPT (at 192 kHz stereo) is only available for licensed copies.


For example, below is displayed an extract from a picture received and corrected, by Josef (DE3JGA).


For a step by step guide, refer to the document “How to receive a LRPT satellite image with Multipsk V.4.44 and "M2_LRPT_Decoder.exe":


See general specifications below.


Other improvements:


·                     Improvement of the SdR demodulation (pour tous les modes).

·                     Windowing improvement of only RX modes, particularly AERO and EGC.

·                     Possibility to read a WAV file stereo (IQ)/16 bits/192 KHz/stereo in RDS and LRPT (with user key).

·                     Updating of the transmitters DGPS list  (thanks to Alan Gate), US, Australian and Japanese DGPS beacons having now closed.

·                     Updating of the MMSI list for GMDSS (thanks to Peter G3UFI).

·                     Updating of the VDL2 ground stations file (thanks to Sergio Sarabia).

·                     In EGC, DXATLAS map added for emergencies positions.


Autex (mode allowing meetings between 2 / 4 / 7 or 13 persons):

Here is a link on a ZIP file containing two Autex WAV files and a small presentation:

At the moment, there is only one Autex 4 meeting proposed: Weekly North American AUTEX Net Mondays 6.30 PM Central USA Time on 7080 USB.

Note about translation of Multipsk.exe and Clock .exe:  the 4.43.1 version of Multipsk has been translated to Spanish by Joachin (EB4Z), from French.



Description of the LRPT mode for METEOR-M2


Baud rate: 72000


Modulation : QPSK (2 bits/symbol)


Shape of pulse : root raised cosine (alpha=0.6)


Bandwidth : about 120 KHz


Demodulation : coherent


Synchronization : thanks to the detection code + test of all phase possibilities


Detection code: yes on 64 bits.


Codes : Convolution code(R(Rate)=1/2, K (Constraint length)=7) + Reed-Solomon (RS(255,223))...


For a more complete description of this protocol, see the article "Decoding digital weather satellite images: the LRPT protocol from Meteor-M2" by Jean-Michel Friedt and the three articles in French "Décodage d'images numériques issues de satellites météorologiques en orbite basse: le protocole LRPT de Meteor-M2" by Jean-Michel Friedt also.


Attention: Multipsk only makes the signal demodulation. The frames and pictures decoding must be made by the Oleg's program "M2_LRPT_Decoder.exe" Version 2015.7.1.33 minimum.







Re: 17M frequencies

Bruno Haineault

I tend to agree with Graham. Although I am open to new HF DATA modes, developers need to integrate and impose LBT (Listen Before Transmit) and/or TDMA-type technologies so that all of these modes don’t mutually clobber each other.


I know that it’s easier said than done as one can’t expect every software to recognize all of the modes. But we need something to prevent mutual interference. If not, it will result in more complaints and ultimately FCC action.


Bruno Haineault, W4AFK

[Local (California): IC-7300 or FLEX-1500  w/LDG RT100 auto tuner & 50‘ of “stealthy” wire for data. Remote (Florida): Kenwood TS-480SAT, GAP Titan DX, “Horse Fence” 75/80m inv V @ 55 feet, ALS-600S. Or FLEX-6400, SmartSDR, Expert 1.3K amp.


Re: VARA FM settings for Icom ID-5100 #VARA


Pre VARA , the average  data  interface , used transformer  coupling and served to  limit the  bandwidth and  introduce 
various  oddities , fine for psk rtty etc, but conveying a complex signal, probably  was not to  common place , yes the modem can work around the  problem, but it  consumes resources ,  often, deployments, unwittingly,   had narrow b/w selected  , and it still  functioned , during  testing  50% b/w reduction , served only to  reduce the  rate . 

So if  usb  direct  link is available , then , that's  optimum, if the  mode  wider , then its  obviously not ,  the  ic7100 has a  12 KHz b/w  option, described as IF-out  to  enable  DRM signals to  be  monitored , never  used it , assume it  uses the  cal-usb link , there is  also a data  tx bandwidth  setting, that is  not  documented , that  allows to  3.5 Khz b/w  but  for  some  reason, the  filter is centered on 1.5 KHz ..

video  showing  use of the  ic7100  IF feed ,  but ,  may be time  lag issue ..have to  check

also  >> You don't have to go to this complex level to use DSD with a IC-7100, you can decode direct from the IC-7100 either via USB AF out or the DATA 2 port using the 9600 pin to the Line in or Mic port on a PC. Just remember to select 9600 in the Connectors menu and FM-D as the mode and away you go. Mike G1ZRN.

Two  ways then ... 

Its not  immediately  clear as to the  5100  facilities , the  manual indicates  a  data  in/out  for  accessing the  DV mode, two models , one with and one without ?  and the  cv-i  address is listed , as is the  com port settings , rig control is not too  well  detailed


Re: VARA FM settings for Icom ID-5100 #VARA


. On the IC-7100 for example, the internal sound card is limited to about 3kHz B/W, not near good enough for Vara FM Wide. I have tested this and it fails miserably,
A month ago, a user was claiming to have good luck receiving 9600 with
the internal interface of the IC-7100. While skeptical, I'm
encouraged to hear that report and look forward to testing it myself

Perhaps VARA_FM could have a split mode functionality where it
received at 9600+/high-bandwidth but transmitted at a lower and
narrower speed.

however, using an external device like a DRA, and setting the external rate to "9600", it then performs fine on Vara FM Wide.
For HF digital, the internal card is fine, and it also works OK for Vara FM Narrow mode.

Re: VARA FM settings for Icom ID-5100 #VARA

Scott Currie

The ID-5100 is a V/UHF dual band FM/D-Star transceiver. It does not have an internal sound card. I'm not even convinced it has much, if any, CAT support. So really not sure why you would need this support from Vara FM.

Also, as to your comment about the internal sound card for other wide B/W modes, this is also not true. On the IC-7100 for example, the internal sound card is limited to about 3kHz B/W, not near good enough for Vara FM Wide. I have tested this and it fails miserably, however, using an external device like a DRA, and setting the external rate to "9600", it then performs fine on Vara FM Wide.

For HF digital, the internal card is fine, and it also works OK for Vara FM Narrow mode.

-Scott, NS7C

Re: VARA FM settings for Icom ID-5100 #VARA


I assume  its the  same as the  IC7100  with  CAT 
if so , the  tx/rx audio is  also via the  USB cat port ?

The usb audio  is preferable to  external  sound card 
in any  case , especially  in the  wide  b/w modes 


Re: VARA FM settings for Icom ID-5100 #VARA

Scott Currie

What sound card interface are you using that you need CAT PTT for the 5100? Just curious...

-Scott, NS7C

Re: 17M frequencies


Not Just  17 meter , all the  bands have been  over run
as the  propagation returns , without a structured multiple 
access ,  its going to jam itself , which will  most probably
cause the  users to  move along the  dial  ..and so on 


Re: VARA FM settings for Icom ID-5100 #VARA


33 mins  later  -)

Will be added  to the next  version  of  VARA-4  FM, to  be  released in  7  days  

Work  around  , using the  existing CAT  listing   

Select IC-7100, for example, and enter  8C in the Icom  CV-I  Address


Re: VARA FM settings for Icom ID-5100 #VARA


Just in the  process of  adding the  ID-5100   to vara list 
BRB as they say 


Two Autex WAV files and a small presentation #autex

Patrick Lindecker

Hello Al,


Hello a link about two Autex WAV files and a small presentation (below).






First page in English – Deuxième page en français

Lindecker Patrick (F6CTE) the 21th of November  2020


In this ZIP file, you have two AUTEX artificial records, supposed made from someone monitoring the meetings (SWL). Records  (made with 2 PCs) are not of very good quality, but sufficient to understand how it works:

·         One file (Autex2.WAV) in AUTEX 2 for a meeting between 2 Hams,

·         The other file (Autex4.WAV) in AUTEX 4 for a meeting between 4 Hams maximum, but here there are only 2 Hams participating to the meeting:

o   F6CTE as “Master” (let’s say the “Master of ceremonies”)  and

o   1ZZ9ABC/M supposed from Mars ☺, as “Guest”).

So 2 more Hams could enter in the meeting.

You can read these files directly, if you have a Multipsk user key. Otherwise, you can read these files with a standard Windows application and apply the generated sound to your sound card input, through a cable connecting the sound card output with the input.


Note the slow secondary channel which displays information about Hams (call sign + name, QTH or other).


Note that while monitoring, you could have to stand repetitions, for example in Autex2.WAV, where “Louise prefers a s” and “agent on the best way to go” are repetitions, this because AUTEX is an “ARQ” mode (i.e. with acknowledgment requests of transmitted messages).


Remember that the “Master” in Autex 4, 7 or 13:

·         must be a powerful station: the more participants, the more the HF power must be elevated,

·         must make run Multipsk in Autex on a fast PC.

For details, consult the manual (“Help” button)



Lindecker Patrick (F6CTE) le 21 novembre  2020


Dans ce fichier ZIP, vous avez 2 enregistrements artificiels en AUTEX, supposés faits par une personne écoutant les réunions (SWL). Les enregistrements (faits avec 2 PC) ne sont pas de très bonne qualité, mais ils sont suffisants pour comprendre comment cela fonctionne:

·         un fichier (Autex2.WAV) en AUTEX 2 pour une réunion entre 2 OM,

·         l’autre fichier (Autex4.WAV) en AUTEX 4 pour une réunion entre 4 OM maximum, mais ici avec seulement 2 OM participant à la réunion:

o    F6CTE comme “Maître” (disons le “Maître de cérémonie”) et

o   1ZZ9ABC/M supposé de Mars ☺, en tant qu’”Invité”.

Donc 2 OM supplémentaires peuvent entrer dans la réunion.

Vous pouvez lire ces fichiers directement, si vous avez une clé utilisateur Multipsk. Sinon vous pouvez lire ces fichiers avec une application Windows standard et appliquez le son produit à l’entrée de votre carte son, à travers un câble connectant l’entrée et la sortie de la carte son.


Notez le canal secondaire lent qui affiche des informations à propos des OM (indicatif + nom,  QTH ou autre).


Notez qu’en écoute, vous pouvez avoir à supporter des répétitions, par exemple avec le fichier Autex2.WAV, où “Louise prefers a s” et “agent on the best way to go” sont des répétitions, ceci car l’AUTEX est un mode de type “ARQ” (c’est à dire avec des demandes d’acquittement des messages envoyés).


Rappelez-vous que le  “Maître” en Autex 4, 7 ou 13:

·         doit être une station puissante: plus il y a de participants et plus la puissance HF doit être élevée,

·         doit faire fonctionner Multipsk en Autex sur un PC rapide.

Pour les détails, consulter l’aide (bouton “Aide”).






De : [] De la part de al2ok
Envoyé : jeudi 19 novembre 2020 19:58
À :
Objet : [digital-mode-radio] AUTEX


What does the mode AUTEX sound like ? I haven't been able to find a sample sound of it on the Internet.


Re: Contestia 16/250 now available with RSID in fldigi and MULTIPSK

Andrew OBrien

Good news, thanks for the info
Andy K3UK

Re: Starting daily 10m PSK activity half-hour

Andrew OBrien

I missed a couple of days due to other commitments but did work a few stations around 600 mile range.

Re: VARA FM settings for Icom ID-5100 #VARA

Andrew OBrien

I had the same issue , did not find a solution.

Re: VARA on FM 2M

Tammy Waggoner


Have you gotten the ID- 5100 to work with VARA FM? I have tried everything but can't get it to work.
Tammy KK4USM

VARA FM settings for Icom ID-5100 #VARA

Tammy Waggoner

I am having trouble setting up VARA FM with my Icom Id-5100. The 5100 is not listed in the radio drop down box. Is there another option?

Re: Starting daily 10m PSK activity half-hour

stan W9SMR


Just saw your post. I have been calling CQ for 10 minutes (11/10/20) and have not seen a trace.

Have you had any success with your 10m activity?


Re: Starting daily 10m PSK activity half-hour

stan W9SMR


What results are you seeing with this daily 10m Activity Half-hour?

If it is promising, I will post it on the  PODXS 070 Reflector.

Thanks, 73,
W9SMR - 070  #1611
PODXS 070 - PR Director

VARA FM settings for Icom ID-5100

Tammy Waggoner

I have been trying to configure VARA FM to work with my Icim ID-5100 but the radio isn't listed in the drop down box. Can anyone help?

17M frequencies

Larry Mundinger

18100 KHz was once the place for modes like PSK but it was taken over by
FT8.  Since sunspots are coming back should we pick another frequency
and try to get some activity going? Would 18104 KHz work?

Larry  KG4Q

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