Need some help with SSDV

[Mika Köching]

Hi all!

I'm currently planning on doing a fairly small HAB launch. The payload is using a raspberry pi to capture video and an rs41 radiosonde for horus v2 messages. I already got the system to capture video and a picture every minute. The picture automatically gets encoded but I'm just stuck at the transmission aspect. I have the binary file and a cc1101 radio module but would be willing to switch to another module. I couldn't find any way to port it to wenet.

Thanks in advance

Mika, DL8MIK (Some might know me from pico-HABing)

[Ben Z en de rest]

add a LoRa module (rfm98w, or some good look alike) to the Raspberry Pi as radiochip.

The Pi In The Sky (PITS) software takes care of all your needs :-) 

DIY Lightweight Pi Tracker with SSDV – Dave Akerman

Ben

Op vr 7 jun 2024 om 20:35 schreef Mika Köching <mika.k...@gmail.com>:

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[Mika Köching]

I already saw that project but couldn't find any documentation ragarding the capturing of a video whilst txing pictures. I really need that feature because I won't have another camera. I know it's a risky move but anything else would weigh too much for me.

Mika

[Mika Köching]

Forgot to say that I'd like to be able to use a standard ham radio receiver or an SDR so I can have more stations participating in receiving. I did try using RadioLib on an Arduino but couldn't find a way to transmit binary data over e.g. rtty.

[David Akerman]

When you say you have the binary file, do you mean that you've converted the jpeg image file to ssdv format?

If so, then all you need to do is transmit the bytes from that SSDV file, in packets of 256 bytes.  You'll want to intersperse those packets with periodic telemetry sentences.  I have a settable ratio in my code so I can get a telemetry packet out every 10 seconds or so. 

Dave

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[Mika Köching]

Oh, I forgot to write I already have that working as well. The only problem is transmitting it. As I wrote I'd like to use something more common in ham radio around here than lora. Will be looking at your code. I'm really bad at c so I've used python for now but I can't seem to get around c.

[Sasha Tim]

Just to clarify - you already do have SSDV encoding working?

Then you really have a few options options:

- Try to port Wenet code

- Use RTTY to transmit SSDV (eh)

- Use FSK with an SX1278 chip but receive with an SX1278 chip (easiest way out)

- Use LoRa with something like gr-lorasdr

- Use FSK with a high speed packetized SDR demodulator

The last one is something I'm currently working on, but it's a long journey. 

--Sasha VE3SVF

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[Mika Köching]

Yes. I have SSDV packets. I do not need any telemetry packets because of the rs41 on board. Will look into lora using the sx1278. I'll hopefully be able to use python.

[Sasha Tim]

Have you tried looking into https://pypi.org/project/pyLoRa/ ?

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[Mika Köching]

Just found that as well. Have a friend who owns some lora modules which I'll try out.