SNR bug with auto_rx native install on Raspbian Trixie

[Mark Jessop]

Hi all,

I've now confirmed a bug on Raspbian Trixie, where a native install of radiosonde_auto_rx will report invalid SNRs (often values >1000 dB). This was traced to a change in GCC 14.

The Docker images of radiosonde_auto_rx are not affected, as these are based on the previous version of Debian, Bookworm. 

If you encounter this issue (look at the reported SNRs in the web interface, on on sondehub.org), then you will either need to switch to a Docker-based installation ( https://github.com/projecthorus/radiosonde_auto_rx/wiki/Docker ) or switch to the testing branch (v1.8.2-beta17), where the issue has been resolved.

Also, apologies for the lack of any updates on this list. I've had little time to work on auto_rx and have mainly been focusing on updates to horusdemodlib. I hope to release 1.8.2 in the next week, so the SNR fix is available in the master branch.

Most of the discussion about auto_rx and the other Project Horus / Sondehub software packages are on Discord: https://sondehub.org/go/discord

73

Mark VK5QI

[Andre PD1AEU]

Also in the beta 16 and 17 the plot path doesn't work anymore, i use the image you provided.

Beta 15 it works, versions after that not.

Keep up the good work, PD1AEU Andre

Op donderdag 15 januari 2026 om 07:08:41 UTC+1 schreef Mark Jessop:

[Mark Jessop]

Ahh bugger. Probably something to do with the changes I had to make to deal with the encrypted radiosonde logs.

Should be able to look into it later in the week.

73

Mark

Sent by means most mobile.

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[Mark Jessop]

I've found the bug in the log file reading code. Not entirely sure why I made a change that completely broke log file reading, but I did. Go me!

While fixing this, I also fixed another bug that stemmed from a deprecation in Numpy 2.3.0, which resulted in log files for most RS41s not being loadable in the web interface. Figuring out the cause of that bug was certainly an adventure! 

I've described the changes here: https://github.com/projecthorus/radiosonde_auto_rx/pull/1040

The new beta version is 1.8.2-beta18. Docker images are still being built. If you can test out this version and check it resolves the issue you were seeing that would be appreciated!

73

Mark VK5QI

[Andre PD1AEU]

Thanks a lot, i will test the beta 18, for now plot path works again ::)

Op zaterdag 24 januari 2026 om 06:47:10 UTC+1 schreef Mark Jessop:

[Andre PD1AEU]

Hi Mark, in my opinion the beta 18 works great, the plot path works good, and receiving levels are also ok.

For me a go!!

73's

Op zaterdag 24 januari 2026 om 16:59:57 UTC+1 schreef Andre PD1AEU:

[Bert Thuiswerkplek]

Hi Mark,
I have seen that you now have created a Beta 19 release for auto_rx.
According to the description you have added "DDETACH..." to the code.
For some of us (me) who are not knowledgeable about software developement, can you explain what/why the "DDETACH..." does or is requierd for?

73's,
Bert PE1KZU

[Mark Jessop]

That's coming out of a discussion in this PR here: https://github.com/projecthorus/radiosonde_auto_rx/pull/1039

It's a build flag for when the rtlsdr utilities are built for the Docker image. It allows the rtlsdr utilities to (attempt to) detach any kernel driver that might have taken over the rtlsdr device. 
I'm still unsure if it actually works from within docker, but it seems harmless enough to add the flag.

73

Mark

To view this discussion visit https://groups.google.com/d/msgid/radiosonde_auto_rx/a41f2061-a019-4a24-892f-9c5d4709d4acn%40googlegroups.com.

[Bert Thuiswerkplek]

Thanks for clarification Mark

73,
Bert PE1KZU

[Andre PD1AEU]

Hi Mark,

in the beta 18 and 19 follow sonde is not working , in the past versions if the sdr locks then in the map it put the sonde in the center of the map, in 18 and 19 it doesn't do that.

73's Andre PD1AEU

Op maandag 26 januari 2026 om 11:45:14 UTC+1 schreef Bert Thuiswerkplek:

[Mark Jessop]

Thanks for pointing this out - I found a bug introduced when I added the encrypted sonde handling code, hopefully it's working now.

Note that you may have to enable 'follow sonde' in the settings pane if that's not enabled by default.

73

Mark VK5QI

To view this discussion visit https://groups.google.com/d/msgid/radiosonde_auto_rx/41a0bc8f-90ec-4309-b3c6-bfaa3fdb877dn%40googlegroups.com.

[Andre PD1AEU]

Hi Mark,

follow sonde works again thanks, it is also automatic starting.

73's Andre PD1AEU

Op woensdag 28 januari 2026 om 22:37:02 UTC+1 schreef Mark Jessop:

[Andre PD1AEU]

Beta 20 works good for me, only thing i have is when sdr 01 gets a signal, it power from idle sdr 02 on in that frequency, i have a radar on the north and south of my house , south won,t get any signal on north, so how is this works , can i both sdr's at the same time scanning ? And get when the signal is detected on sdr 01 it stays on sdr 01?  And how to scan with 2 sdr's at the same time with every sdr has his own only scan? Now i have to use 2 raspberry's for each sdr to do this.

Op donderdag 29 januari 2026 om 00:01:37 UTC+1 schreef Andre PD1AEU:

[Mark Jessop]

auto_rx was written with the assumption that all the SDRs are connected to a single antenna, so the behaviour you are seeing is what is expected.

So yes, if you want to have different antennas looking at different things, that means multiple auto_rx instances.

73

Mark VK5QI

To view this discussion visit https://groups.google.com/d/msgid/radiosonde_auto_rx/3590eab4-6de3-4dbd-8be2-1cd48df31e59n%40googlegroups.com.

[Andre PD1AEU]

Ok Mark, clear, then a future request :) to use different sdr's on different antenna's , in my situasion , on 1 antenna and sdr i could take only north, in the Netherlands we ha a quiete unique position, on north i get Netherlands and Germany baloons , in a range of 300 km , in te south , Belgium , Germany, England  , France also in a range more than 300 km, the position of my house and antenna's don't allow free sight in each direction. It woul'd be nice too capture that on 1 radio rx and raspberry.

Keep up the good work i enjoy it a lot.

73s Andre PD1AEU

Op zaterdag 31 januari 2026 om 00:55:41 UTC+1 schreef Mark Jessop: