From 
The OM3KSI radio club in cooperation with the Slovak Space Activities Organization is preparing for Saturday, May 15, 2021 at approximately 8 a.m. our time. Stratospheric balloon launch from Malé Bielice airport near Partizánské. The balloon will carry several experiments and will also be part of it SSTV maják v pásme 144 MHz. Stratosférický balón bude vypustený pri príležitosti výročia štartu prvého kozmonauta Jurija Gagarina do vesmíru. Dňa 12. apríla tohto roku uplynulo presne 60 rokov od tohto historického momentu.
The following transmitters are placed on the balloon:
You will read in the article
Transmitter for telemetry
The transmitter for telemetry transmits basic data such as GPS coordinates, height.
Type: radiosonde RS-41
Frequency: 434.650 MHz
Power: 10 mW
Mód: RTTY 50bd 7N1
SSTV beacon OM0MVX
The beacon transmitter OM0MVX will broadcast during the SSTV flight images for the anniversary of Yuri Gagarin.
Type: Dorji DRA818V
Frequency: 144.500 MHz
Power: 1 W
Mode: SSTV PD120
Experimental LoRa transmitter
The experimental LoRa transmitter will transmit basic telemetry data such as position, height, temperature and pressure in the 868 MHz band. The 9DOF sensor will provide information about the orientation and accelerations of the radiosonde.
We recommend using the DL-FLDIGI software to decode the telemetry data about the position of the radiosonde.
TNX info Dušan OM3WAK