How to recieve 433 and 868 signals with one Reciever and rtl_433? #3069

kami83 · 2024-10-15T12:19:52Z

kami83
Oct 15, 2024

Hi, i would like to decode my Bresser 7in1 Weather sensor (868M) and some different sensor from 433M. Temporaly i am using one rtl-sdr with a raspberry. Can i configure it to recieve the new Bresser sensor?

BR kami

Answered by HolgerAusB

Oct 15, 2024

as long, as you have no time critical sensors, aka alarms, you can hop frequencies:

rtl_433 -f 433.53M -f 686.02M -H 600

this will hop every 5 minutes (600 seconds) to the other frequency. You might change or strip the decimal part to your needs. And you should test, how often the sensors sending data. Everything above 5 minutes makes it difficult.

And, of course, you will loose all data on the frequency, which is not active in the interval. But for weather stations, that should be OK.

View full answer

HolgerAusB · 2024-10-15T14:32:39Z

HolgerAusB
Oct 15, 2024

as long, as you have no time critical sensors, aka alarms, you can hop frequencies:

rtl_433 -f 433.53M -f 686.02M -H 600

this will hop every 5 minutes (600 seconds) to the other frequency. You might change or strip the decimal part to your needs. And you should test, how often the sensors sending data. Everything above 5 minutes makes it difficult.

And, of course, you will loose all data on the frequency, which is not active in the interval. But for weather stations, that should be OK.

3 replies

kami83 Oct 15, 2024
Author

Thanks a lot. This works fine.

lemek84 Oct 17, 2024

Can I set a different sample rate for each frequency?

What I've tried:

rtl_433 -f 433.92M -s 250k -f 868.95M -s 1200k -H 90 -R 91 -R 104 -C si

but only the last given sampling rate is taken into account.

zuckschwerdt Oct 17, 2024
Collaborator

There is only one global sample rate. It does not change with hops. If you need more options then you need to use the HTTP-API (-F http) to effect hops and e.g. sample rate changes. E.g. xh :8433/cmd cmd==center_frequency val==433920123 xh :8433/cmd cmd==sample_rate val==250000 xh :8433/cmd cmd==gain arg==10 …

AkaBoing · 2024-10-16T09:31:32Z

AkaBoing
Oct 16, 2024

hi kami83,
-H 600 works, but u loose a lot of messages at 866 Mhz.
try rtl_433 -C si -M level -f 433.92M -f 868.95M -s 1200k -H 25
this works best for Bresser 7in1 Weather sensor and ofc all M-Bus devices
have fun
Boing

1 reply

kami83 Oct 16, 2024
Author

Hi, thanks a lot for your reply, but i don't understand the difference why do you use -C si, -s 1200k and -M level. I understand that you go down with the hop level, but what about the rest? i just use -R 42 -R 195 -R 121 -R 173 to get messages from my devices.

BR kami

AkaBoing · 2024-10-16T16:06:13Z

AkaBoing
Oct 16, 2024

hi kami,

sry for the overhead.
-C si converts units f.i. °F to °C Default is "native" > "Fahrenheit"
-s 1200k is usefull for long telegrams f.i. M-Bus with 150+ Bytes
-M level adds signal level to output

simply use "rtl_433 rtl_433 -f 433.92M -f 868.95M -H 25" if u dont need above.

Boing

10 replies

zuckschwerdt Oct 17, 2024
Collaborator

sure, looks good!

AkaBoing Oct 17, 2024

hi lemek,

if u are on linux:
bash is your friend:

make a script in /home
timehop.sh
#!/bin/bash

while :
do
rtl_433 -f 433.92M -s 250k -R 91 -R 104 -C si -T 90
rtl_433 -f 868.95M -s 1200k -R 91 -R 104 -C si -T 90
sleep 1
done

then start ./timehop.sh or better ; let it autostart

if Windows then dunno, but should be possible too

have fun
Boing

Windows ? dunno, but should be possible..

k-str50 Oct 19, 2024

sure, looks good!

@zuckschwerdt ,
I'm sorry that I have to ask again.
It seems as if a reception depends on the weather (sunshine). I only get data very sporadically. Could it be that the transmission power depends on the solar radiation?
Can I possibly adjust the sensitivity?
Kurt

zuckschwerdt Oct 19, 2024
Collaborator

Use -M level -M noise and watch the levels. Noise will tell you if the band is clear (expect around -20 dB, at worst -15 dB) and signal level will show you if autogain works, should be near -0 dB but could be much fainter.

k-str50 Oct 19, 2024

I sent this command :
rtl_433 -R 32 -f 868.6M -Y autolevel -M level -M noise
This is the result:
Auto Level] Current noise level -15.2 dB, estimated noise -15.2 dB
It's not really good.
Should I use autogain?

AkaBoing · 2024-10-19T11:32:49Z

AkaBoing
Oct 19, 2024

Hi k-str50, Check your antenna and (or) cable. Even a very simple dipol for 868 Mhz gives very good results. Which RTL device u use?, antenna? Indoor or Outdoor use? Check without -R 32 for 5 minutes rtl_433 -f 868.6M > output.txt Post output.txt here. On Linux take Gqrx with 868M Any Signal? My Output with a 868 dipol [102;92m[ [30mSDR [92m] [0m Using device 0: Realtek, RTL2838UHIDIR, SN: 00000001, "Terratec Cinergy T Stick RC (Rev.3)" [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -18.1 dB, adjusting minimum detection level to -15.1 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -20.8 dB, adjusting minimum detection level to -17.8 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -23.0 dB, adjusting minimum detection level to -20.0 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -25.0 dB, adjusting minimum detection level to -22.0 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -26.7 dB, adjusting minimum detection level to -23.7 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -28.3 dB, adjusting minimum detection level to -25.3 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -29.5 dB, adjusting minimum detection level to -26.5 dB [103;93m[ [30mAuto Level [93m] [0m Current signal level -14.9 dB, estimated noise -29.4 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -30.5 dB, adjusting minimum detection level to -27.5 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -31.6 dB, adjusting minimum detection level to -28.6 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -32.6 dB, adjusting minimum detection level to -29.6 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -31.6 dB, adjusting minimum detection level to -28.6 dB [103;93m[ [30mAuto Level [93m] [0m Current noise level -32.1 dB, estimated noise -31.4 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -30.6 dB, adjusting minimum detection level to -27.6 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -31.7 dB, adjusting minimum detection level to -28.7 dB [103;93m[ [30mAuto Level [93m] [0m Estimated noise level is -32.9 dB, adjusting minimum detection level to -29.9 dB [103;93m[ [30mAuto Level [93m] [0m Current noise level -32.7 dB, estimated noise -32.1 dB Boing k-str50 ***@***.***> schrieb am Sa., 19. Okt. 2024, 12:30:

…

I sent this command : rtl_433 -R 32 -f 868.6M -Y autolevel -M level -M noise This is the result: Auto Level] Current noise level -15.2 dB, estimated noise -15.2 dB It's not really good. — Reply to this email directly, view it on GitHub <#3069 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BJYMOYTJOAZPZBLPTKWLRF3Z4IYEBAVCNFSM6AAAAABP7AUJK6VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTAOJZGA2DANI> . You are receiving this because you commented.Message ID: ***@***.***>

1 reply

k-str50 Oct 21, 2024

@AkaBoing
Thank you very much for your suggestion.
I have a dongle of the type Realtek


lsusb
Bus 001 Device 004: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T

I have attached a picture of the antenna.

The command

rtl_433 -f 868.6M > output.txt
rtl_433 version 23.11-168-g322e04ff branch master at 202410160342 inputs file rtl_tcp RTL-SDR

New defaults active, use "-Y classic -s 250k" if you need the old defaults

Detached kernel driver
Found Fitipower FC0012 tuner
Exact sample rate is: 1000000.026491 Hz
Allocating 15 zero-copy buffers

results in this result.
output.txt

How should I use gqrx? There is a GUI or the cli version. Which one is meant? And what exactly should I do?

Can you please write to me what I should continue to do?
Kurt

AkaBoing · 2024-10-21T11:56:34Z

AkaBoing
Oct 21, 2024

Hi, k-str50, Your device RTL 2832U OEM is working. The antenna is simple but useable. The output shows 8x Smoke Detektor HAG and one -R 155 Fineoffset - WHx080 , all plausible

…

-R 32 is 433.92M, take -R 155 instead On Debian or Ubuntu take the GUI Version of Gqrx, should be in APT repos. Play with this tool, simple but very usefull. have fun Boing k-str50 ***@***.***> schrieb am Mo., 21. Okt. 2024, 13:15:

@AkaBoing <https://github.com/AkaBoing> Thank you very much for your suggestion. I have a dongle of the type Realtek lsusb Bus 001 Device 004: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T I have attached a picture of the antenna. DSCN0019.JPG (view on web) <https://github.com/user-attachments/assets/69c6e6a3-3285-45c8-b7ca-86caac656fea> The command rtl_433 -f 868.6M > output.txt rtl_433 version 23.11-168-g322e04ff branch master at 202410160342 inputs file rtl_tcp RTL-SDR New defaults active, use "-Y classic -s 250k" if you need the old defaults Detached kernel driver Found Fitipower FC0012 tuner Exact sample rate is: 1000000.026491 Hz Allocating 15 zero-copy buffers results in this result. output.txt <https://github.com/user-attachments/files/17459700/output.txt> How should I use gqrx? There is a GUI or the cli version. Which one is meant? And what exactly should I do? Can you please write to me what I should continue to do? Kurt — Reply to this email directly, view it on GitHub <#3069 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BJYMOYT24VA2Z7TF3EUHDHDZ4TO4TAVCNFSM6AAAAABP7AUJK6VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCMBQGQZDMOI> . You are receiving this because you were mentioned.Message ID: ***@***.***>

0 replies

AkaBoing · 2024-10-21T12:42:23Z

AkaBoing
Oct 21, 2024

moin k-str50 ELV sagt mir: Germany Die Rauchmelder in deiner Nähe können dein -R 155 Sensorsignal massiv stören. Also die Antenne möglichst weit weg davon aufstellen. Gruß Detlef. Detlef Haasper ***@***.***> schrieb am Mo., 21. Okt. 2024, 13:56:

…

Hi, k-str50, Your device RTL 2832U OEM is working. The antenna is simple but useable. The output shows 8x Smoke Detektor HAG and one -R 155 Fineoffset - WHx080 , all plausible -R 32 is 433.92M, take -R 155 instead On Debian or Ubuntu take the GUI Version of Gqrx, should be in APT repos. Play with this tool, simple but very usefull. have fun Boing k-str50 ***@***.***> schrieb am Mo., 21. Okt. 2024, 13:15: > @AkaBoing <https://github.com/AkaBoing> > Thank you very much for your suggestion. > I have a dongle of the type Realtek > > > lsusb > Bus 001 Device 004: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T > > I have attached a picture of the antenna. > DSCN0019.JPG (view on web) > <https://github.com/user-attachments/assets/69c6e6a3-3285-45c8-b7ca-86caac656fea> > The command > > rtl_433 -f 868.6M > output.txt > rtl_433 version 23.11-168-g322e04ff branch master at 202410160342 inputs file rtl_tcp RTL-SDR > > New defaults active, use "-Y classic -s 250k" if you need the old defaults > > Detached kernel driver > Found Fitipower FC0012 tuner > Exact sample rate is: 1000000.026491 Hz > Allocating 15 zero-copy buffers > > > results in this result. > output.txt > <https://github.com/user-attachments/files/17459700/output.txt> > > How should I use gqrx? There is a GUI or the cli version. Which one is > meant? And what exactly should I do? > > Can you please write to me what I should continue to do? > Kurt > > — > Reply to this email directly, view it on GitHub > <#3069 (reply in thread)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/BJYMOYT24VA2Z7TF3EUHDHDZ4TO4TAVCNFSM6AAAAABP7AUJK6VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCMBQGQZDMOI> > . > You are receiving this because you were mentioned.Message ID: > ***@***.***> >

0 replies

AkaBoing · 2024-10-21T14:06:00Z

AkaBoing
Oct 21, 2024

last attempt;
try rtl433 -f 868.6M -M level -s 300k >output2.txt
-M level gives Freq1 and Freq2, RSSI,, SNR and NOISE
-s 300k keeps distance from M-Bus at 868.95M
Boing

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How to recieve 433 and 868 signals with one Reciever and rtl_433? #3069

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kami83 Oct 15, 2024 Author

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