rtl 433 tempest weatherflow station?

[#LifeIsBetterOnTheBeach#]

Hello anybody know on what frequency are the Tempest weatherflow stations are transmit.Did somebody encode already the tempest stations.??

Thanks 

[Christian Z.]

We had no mention of "Tempest weatherflow" in the rtl_433 project. If it's not a rebrand then it needs to be analyzed before it can work.

For a modern weather station I'd expect the frequency (in Europe) to be 868MHz.

[#LifeIsBetterOnTheBeach#]

Im right now in Cabarete Dom Rep. they have a station guess import from us. So ill try to get some signals.

I need Wind datas for my Kitesurfer Wind App 😀

[#LifeIsBetterOnTheBeach#]

it would be amazing if somebody can help me analyze this data and integrate to rtl 433 tempest has already a nice network of weather stations.

[#LifeIsBetterOnTheBeach#]

https://tempestwx.com/map/6.3685/-78.506/4

[Christian Z.]

Grab a sample https://triq.org/rtl_433/ANALYZE.html

and we'll see if it's an easy one. But supporting new sensors might take weeks.

[#LifeIsBetterOnTheBeach#]

i have this infos is this helpful

Certifying authority: CE. Base frequency: 863 MHz. Channel Spacing: 400 kHz. Channels: 863, 863.4, 863.8, 864.2, 864.6 MHz. Modulation: 2GFSK 100 kbps. Number of channels: 5

[Christian Z.]

Yes, that is helpful. If it is accurate :)

100 kbps is very fast. I would expect 10 kbps only.

2GFSK is supported by rtl_433. It's our usual FSK.

The frequency and channel count is strange. You can watch 3 channels at the same time:

 rtl_433 -f 864.3M -s 1024k -S unknown

Let it run for some time. A few "Saved signal" should appear.

Then locate the .cu8 files, zip and upload.

[Leo Herzog]

I am also interested in rtl_433 support for the WeatherFlow Tempest! I have captured a few packets from where it operates, which is 906MHz.

sudo  rtl_433 -f 906M -s 1024k -S unknown

[Christian Z.]

Those recordings do not look like a complete signal, they are cut off at both ends. If you can time it maybe record with the -T option instead of the -S option.

E.g. for a 30 seconds recording:

 rtl_433 -f 906M -s 1024k -w tempest_906M_1024k.cu8 -T 30

[Leo Herzog]

Great! Attached.

https://drive.google.com/file/d/13x-MdJIPirPKmruFMtmQIRxZQNpSjatE/view

[Christian Z.]

That is really strange. The whole 2 minutes is a signal, and there is no indication if that is even the full signal.

The shape is also strange, as if it is a sweeping tone (down towards the 60s mark then back up again) but in FSK.

[#LifeIsBetterOnTheBeach#]

Hello what ist the progress of the tempest protocol?

how can i help 

at the moment i`m super busy with my Kwind project but it would be great to have this protocol and a small easy to use rtl device plug and play here are some detail about project Kwind

https://www.heliumsmartworld.com/

[Christian Z.]

We need captured samples that look like data packets. https://triq.org/rtl_433/ANALYZE.html

The prior ones just look like jamming or beacon signal.

Another thing comes to mind: is the signal maybe LoRA? (Long running and slow changing...) We can't decode that.

[#LifeIsBetterOnTheBeach#]

thats the chip of a tempest

[#LifeIsBetterOnTheBeach#]

this tempest devices made me anyway a lot of headache when i measured wind for the kite world cup they failed a lot. So far im very happy with the ecowitt ws90 and ws80

[Benjamin Larsson]

On 07/09/2023 20:51, #LifeIsBetterOnTheBeach# wrote:
> Hello what ist the progress of the tempest protocol?
> how can i help

The signal modulation cant be handled with the current code in rtl_433.
Support for this device is unlikely.

MvH
Benjamin Larsson

[Leo Herzog]

I just contacted Weatherflow asking for more details. They shared this information:

• Base frequency: 902 MHz.
• Channel Spacing: 2000 kHz.
• Channels: 902, 906, 908, 910, 912 MHz.
• Number of channels: 5.
• Modulation: OQPSK 100kpbs with DSSS.

Here are five fresh captures, of each frequency:

rtl_433 -f 9XXM -s 1024k -w tempest_9XXM_1024k.cu8 -T 30

https://drive.google.com/drive/folders/1e_T5q_IaLiViHqzYVlupNTpoDKqELHKr

 

---

Leo Herzog

IT Interaction Technologist
Hope College

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[Christian Z.]

Very interesting! Though OQPSK is rather advanced and in any case PSK is not supported by rtl_433. I doubt a simple general purpose demod can grab these codes. You would need a demod specifically for OQPSK. Or maybe a matching transceiver chip.