Regarding Observation 12389827 …
Can someone help identify the pattern here. Based on the website examples I believe the tangent lines down the trace are terrestrial interference. But what are the FSK kind of lines running between the tangent lines? I’ve got this pattern behind even some strong signals like the ISS but it appears often in traces without a center observation. I clicked on the Your Topic is similar to observations but none match.
Not an expert on the signals, so I let others to comment on it. I’ve just post to confirm that these signals are from a terrestrial source.
Could you be receiving the transmitter from an meteorologic balloon ?
Thats possible, I’m 25 miles south of ILN in Wilmington, Ohio. I’ve seen it a few times. I’ll keep an eye on the times and look for the pattern. Is there a reference for their transmit frequency?
tracker.sondehub.org should show the active balloons in your area, if you set, for example, last 3 hours. On the left you can find the balloons with their transmitter info.
Thats pretty cool, I’ll follow that. Looks like a new project, the wife will be thrilled 
. Thanks
If you recover two I will exchange you one Dutch RS41 for one of your models 
I’ll keep it in mind. I’ve got an extra pi5 but fresh out of RTL-SDR’s. Once the funny lookin blue truck brings some more I’ll get some tracking started 
ILN uses Graw DFM17 devices on 403.810. I scheduled 6 passes on their next flight tonight to see if I get the interference. I can clearly hear the beacon on my FTM400 so if the blue truck people arrive today I may have a listening site provisioned and monitoring by then. If one comes close by I’ll contact you and send it to you
can you take the picture of your dutch RS41?
hope you get and can recover that radiosonde..
403.810 does not interfere with 400.220 MHz. I think I notice the RS41 signal in your waterfall. DFM17 has another modulation type.
RS41 can be viewed here https://photos.app.goo.gl/v8rUTLlDCDaYxUSy2 and if you llike more closeup PCB images that’s no problem too.
In this topic we found Cape Canaveral being the source of the same modulation type in an sat obs
look like this simple radiosonde and balloon weather are common in your country. this is a new thing for me.
We hunt them. Recover the electronics and balloon / chute remains from the environment. After that we re-program the electronics with Horus firmware and fly them on radio amateur frequencies. Then the recovery starts again 
On the “open day” at the Dutch meteorological institute last october we flew a camera pointing up, you can see the size of the balloon on ground level compared to 1 minute before burst, a free space shot after burst and what happens when the balloon remains and chute got tangled up.
The camera was succesfully recovered from Germany by friends of other visitors from that open day.
Let me add a bit more of adventure to that, we also did freeze a pizza in space.
Launched from my work location.
wow.. amazing. very fun.
I was looking for information about balloons and accidentally found it here. I’m very curious about balloons. Do you have recommendations for beginners? What about the regulation in your country? Is it easy and quick to release a ballon with hight altitude like you do? I have so many questions in my head. I opened your QRZ page, and it mentioned LoRa cameras. Is there any information or link? Thank you."
www.pe2bz.nl/hamradio shows diy lora transmitters and lora receivers.
Pi (zero, 2,3,4 ) can transmit camera images with ssdv tracker software.
Baloon rules over here are not that difficult, of payload < 2 kg, balloon size inflated at sea level < 2 m, and a parachute attached to reduce descend speed to approx 5 m/s and > 8km away from airport.
You could check for local launches and try to join one. Amateur balloons are on amateur.sondehub.org with very nice grafana plots too,
Pi zero and camera in an RS41 housing
wow very interesting. i will learn from all of this link. ssdv like sstv right? but look like with better resolution. you have example of image / video send using ssdv over lora from baloon?
are amateur can launch the baloon at anytime permisionless if all above requirements are met ? or still need permission maybe in 1x24 hour from local authority ?
“we” do not need permit. Even if I launch from within 8 km of an airport is states “inform the flight harbour manager” and not to request permission.
and about the resolution, if you set it for 640 x 480 you get an image every 2 minutes. If you set it for 1920 X 1080 the image takes longer and the chance of error packets is larger. Usually I try 800 x 600 for transmitting and 1920 x 1080 for storage on the SD card. or even 4000 X 3000 for the 12mp camera
maybe the next satellite should send the image using ssdv over lora. very good res compare with old sstv
