I know that 300 km from my seat is situated Ventspils Augstskola (Ventspils Highest School) what have decade long experience with satcubes launching in lower Space, and they specializes in electronics design for those students project. Sure they have a certain proffessor who knows these details about what I am only guessing. Here is the Univeristy official address venta@venta.lv where You may kindly ask to contact the person who knows sth about Low Space CubSat projects. I am sure they in the small rural University are kind persons and will answer readily.

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There are several LoRa birds currently in orbit. A web search will find them. You might also be interested in Fossa Systems.

 

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There are several LoRa birds currently in orbit. A web search will find them. You might also be interested in Fossa Systems.

Thanks

 

Undoubtly LORA may punch the ionosphere, but the video stream in real time demands a channel width. What is completely lacked then. So I would use it only for command telegraphy no more.

 

Undoubtly LORA may punch the ionosphere, but the video stream in real time demands a channel width. What is completely lacked then. So I would use it only for command telegraphy no more.

My main goal is to get a pic every 10s... like creating a time lapse.. i dont want live telecasting as that will be very power consuming.... Thanks a lot.. And also I have dropped a mail to the email you have given.. let's see what happens.. Thank you

 

Undoubtly LORA may punch the ionosphere, but the video stream in real time demands a channel width. What is completely lacked then. So I would use it only for command telegraphy no more.

He doesn’t say he wan’t streaming video, and it would be much too costly to do no matter what the PHY and LINK layers are. The satellite would never have the energy budget for such a thing. Still photography is different, which is what he said he wants—though the resolution may have to be adjusted to make it practical.

 

My main goal is to get a pic every 10s... like creating a time lapse.. i dont want live telecasting as that will be very power consuming.... Thanks a lot.. And also I have dropped a mail to the email you have given.. let's see what happens.. Thank you

I don’t think you will have the energy budget to do 10s intervals at that resolution. You will also find that it will take more than 10s to send one image at that resolution so you may not have the memory resources for a time lapse of useful length anyway.

 

No matter what if you are actually going to build this, you need to start right now making earth-bound prototypes to make power measurements and work out how to use your limited space. You will also need to work out the power system and be sure you know what battery will tolerate being in LEO, etc.

 

I don’t think you will have the energy budget to do 10s intervals at that resolution. You will also find that it will take more than 10s to send one image at that resolution so you may not have the memory resources for a time lapse of useful length anyway.

Yeah I'm probably thinking of every 1 min a photo. And also I found out this even more "power-hungry" module at transmits at 34dbm?

1. E32-433T37S:
   • Frequency: 433MHz
   • Transmit Power: Maximum 32dBm to 34dBm
   • Receiver Sensitivity: -145dBm to -148dBm
   • Air Rate: Configurable by the user
   • Antenna Interface: SMA-K

 

No matter what if you are actually going to build this, you need to start right now making earth-bound prototypes to make power measurements and work out how to use your limited space. You will also need to work out the power system and be sure you know what battery will tolerate being in LEO, etc.

i have thought of using Peltiers to heat up all the parts once in the dark side and cool them when they're in the sunlit side. Also the battery will have its own heater at around 25C? I have chosen a Li-ion battery as they seem more cost affordable and less explosive then LiPos in the case of a problem in the peltiers..



I guess a power output of 80A is more than enough for the 8 peltiers and the LoRa?

 

Yeah I'm probably thinking of every 1 min a photo. And also I found out this even more "power-hungry" module at transmits at 34dbm?

1. E32-433T37S:
   • Frequency: 433MHz
   • Transmit Power: Maximum 32dBm to 34dBm
   • Receiver Sensitivity: -145dBm to -148dBm
   • Air Rate: Configurable by the user
   • Antenna Interface: SMA-K

You almost certainly can’t use that in space. You need to investigate the regulatory limitations on transmitting from space. You also probably don’t need more power output from the transmitter because you probably can’t afford it given your energy budget. Your bandwidth is going to be limited by the size of your PVs and battery.

 

1. E32-433T33S:
   • Frequency: 433MHz
   • Transmit Power: Maximum 33dBm
   • Receiver Sensitivity: -148dBm
   • Air Rate: Configurable by the user
   • Antenna Interface: SMA-K

1. E32-433T37S:
   • Frequency: 433MHz
   • Transmit Power: Maximum 32dBm to 34dBm
   • Receiver Sensitivity: -145dBm to -148dBm
   • Air Rate: Configurable by the user
   • Antenna Interface: SMA-K

1. E32-433T30S:
   • Frequency: 433MHz
   • Transmit Power: Maximum 30dBm
   • Receiver Sensitivity: -149dBm
   • Air Rate: Configurable by the user
   • Antenna Interface: SMA-K

1. E32-433T20S:
   • Frequency: 433MHz
   • Transmit Power: Maximum 20dBm
   • Receiver Sensitivity: -142dBm
   • Air Rate: Configurable by the user
   • Antenna Interface: SMA-K

are the 4 models that are good enough in my POV

 

Yeah I'm probably thinking of every 1 min a photo. And also I found out this even more "power-hungry" module at transmits at 34dbm?

1. E32-433T37S:
   • Frequency: 433MHz
   • Transmit Power: Maximum 32dBm to 34dBm
   • Receiver Sensitivity: -145dBm to -148dBm
   • Air Rate: Configurable by the user
   • Antenna Interface: SMA-K

You almost certainly can’t use that in space. You need to investigate the regulatory limitations on transmitting from space. You also probably don’t need more power output from the transmitter because you probably can’t afford it given your energy budget. Your bandwidth is going to be limited by the size of your PVs and battery.

 

i have thought of using Peltiers to heat up all the parts once in the dark side and cool them when they're in the sunlit side. Also the battery will have its own heater at around 25C? I have chosen a Li-ion battery as they seem more cost affordable and less explosive then LiPos in the case of a problem in the peltiers..

View attachment 302212

I guess a power output of 80A is more than enough for the 8 peltiers and the LoRa?

How big so you expect this satellite to be? What is the maximum volume and weight you can lift?

 

How big so you expect this satellite to be? What is the maximum volume and weight you can lift?

I guess a 10kg satellite?

 

I dont care about the size actually, the brain of the satellite will be an ESP32 S3 or a RPi Zero...

 

You almost certainly can’t use that in space. You need to investigate the regulatory limitations on transmitting from space. You also probably don’t need more power output from the transmitter because you probably can’t afford it given your energy budget. Your bandwidth is going to be limited by the size of your PVs and battery.

right so I'll stick to the original module but instead use the 868mhz version as there are larger antennae available for that frequency.

 

https://space.stackexchange.com/que...-probe#:~:text=They are, in,close the louvers.

 

So this is all theoretical? You won’t be building anything?

 

So this is all theoretical? You won’t be building anything?

Currently, yes, but I plan to build it in the coming future.

 

I want to just check if this will work or not.. Is this project feasible or not.