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Re: MultiPSK LRPT

Publicado: 10 Oct 2020 07:15
por Naval
Hola a todos,

en el futuro, Multipsk también puede decodificar las señales del LRPT.

73 Josef
DE3JGA

Hello to all,

For the possibility to demodulate LRPT pictures, I proposed this test version 1:
http://f6cte.free.fr/MULTIPSK_4_44_test_version_1.zip



Paste this address in your Internet Explorer or equivalent. Download the file.
Extract the ZIP file and replace the “official” Multipsk.exe with this test version. Before, make a copy of the “official” Multipsk.exe, in case of. It is also proposed new help manuals (chm files).



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 auxiliary function of playing/recording of WAV files in LRPT (at 192 kHz stereo) is only available for licencied copies.



Thanks for reports on this forum.



Click right over a LRPT button to get the LRPT manual.



Note: it seems difficult to monitor the METEOR-M2 satellite with a sufficient Signal to Noise ratio for demodulation, at least in the “radio pollution” of big cities (to confirm or deny).



73

Patrick

Re: MultiPSK LRPT

Publicado: 10 Oct 2020 10:38
por Rapidbit
Gracias por la info.
Saludos.

Re: MultiPSK LRPT

Publicado: 11 Oct 2020 14:28
por ANgazu
Hola.
gracias por la info.

Rapidbit, a ver si quedamos y me pones al dia de esto de los satelites, que el HF esta algo congelado.

Saludos.
ANgazu.

Re: MultiPSK LRPT

Publicado: 12 Oct 2020 20:51
por Delta-Titan
A proposito del Multipsk, aun recuerdo epocas pasadas en que se solia recurrir a la bodega "bolchevique" para tener una version free y demas cosillas "non-sacntas" sobre radio, sabe alguno si ya existe algo similar en estas epocas de encierro?
Saludos.

MultiPSK LRPT

Publicado: 30 Oct 2020 12:03
por Naval
Hola a todos,

recibido esta mañana, los Pirineos.

Meteor M2
QRG: 137.100 MHZ
Antena: Diamond X50
Cable: 10m RG58 sin amplificador!
RX: SDRplay RSPdx

73 Josef
DE3JGA

Re: MultiPSK LRPT

Publicado: 30 Oct 2020 19:05
por Rapidbit
Buena captura....
Saludos.

MultiPSK LRPT

Publicado: 06 Nov 2020 09:51
por Naval
Los Alpes.

73 Josef
DE3JGA

MultiPSK LRPT

Publicado: 08 Nov 2020 16:39
por Naval
Sobrevuelo de hoy a las 07:25 UTC.

73 Josef
DE3JGA