Not seeing as many items as I expect

[dshoen619]

Hi Everyone,

Im using 2 RTL SDR Blog v4 in parallel on a raspberry PI. I am trying to monitor TPMS events. I receive events but not as much as I expect. I am using making a string of this list and executing it with rtl_433 to search for TPMS.

        command_list = [
            "-M", "level", "-M", "time", "-F", "json",
            "-R", "59", "-R", "60", "-R", "82", "-R", "88", "-R", "89",
            "-R", "90", "-R", "95", "-R", "110", "-R", "123", "-R", "140",
            "-R", "156", "-R", "168", "-R", "180", "-R", "186", "-R", "201",
            "-R", "203"
        ]
    

The Vast majority of my events are Toyota. I record it in a parking lot and get an event roughly every minute. Does this seem normal? I expected to see much more events?

Any insight would be appreciated. Thank you :)

[zuckschwerdt]

You might want to use -Y autolevel -M level -M noise to improve recption and to monitor noise levels.

[dshoen619]

Thank you, I think the issue Im seeing is actually different. I realize that sometimes when I run rtl_433 I get a lot of incoming data and some times it stuck upon loading like this

adkdeveloper@adk-sensor:~/rtl_sdr$ /usr/bin/rtl_433
rtl_433 version 21.12 (2021-12-14) inputs file rtl_tcp RTL-SDR SoapySDR
Use -h for usage help and see https://triq.org/ for documentation.
Trying conf file at "rtl_433.conf"...
Trying conf file at "/home/adkdeveloper/.config/rtl_433/rtl_433.conf"...
Trying conf file at "/usr/local/etc/rtl_433/rtl_433.conf"...
Trying conf file at "/etc/rtl_433/rtl_433.conf"...
Registered 176 out of 207 device decoding protocols [ 1-4 8 11-12 15-17 19-23 25-26 29-36 38-60 63 67-71 73-100 102-105 108-116 119 121 124-128 130-149 151-161 163-168 170-175 177-197 199 201-207 ]
Found Rafael Micro R828D tuner
RTL-SDR Blog V4 Detected
Exact sample rate is: 250000.000414 Hz
Sample rate set to 250000 S/s.
Tuner gain set to Auto.
Tuned to 433.920MHz.
baseband_demod_FM: low pass filter for 250000 Hz at cutoff 25000 Hz, 40.0 us

I have reset the usb hubs, reset sudo, but I still do not see anything

[AkaBoing]

hi dshoen619,
your rtl_433 is very old.
we have now 275 registered decoder and a lot of finetuning in the background
current version is rtl_433 version 25.02-4-gda289d37 branch master at 202503111533

take a look at "building.md" for more info.
have fun

[dshoen619]

Thank you for the tip. I downloaded the newest version and then I also tried downloading the docker. I run it and still get no data

sudo docker run --rm --device=/dev/bus/usb -it hertzg/rtl_433 -Y autolevel -M level -M noise
rtl_433 version 25.02 branch at 202502191252 inputs file rtl_tcp RTL-SDR with TLS
Found Rafael Micro R828D tuner
RTL-SDR Blog V4 Detected
[SDR] Using device 0: RTLSDRBlog, Blog V4, SN: 00000001, "Generic RTL2832U OEM"
Exact sample rate is: 250000.000414 Hz
[Auto Level] Estimated noise level is -17.4 dB, adjusting minimum detection level to -14.4 dB
[Auto Level] Estimated noise level is -19.3 dB, adjusting minimum detection level to -16.3 dB
[Auto Level] Estimated noise level is -20.9 dB, adjusting minimum detection level to -17.9 dB
[Auto Level] Estimated noise level is -22.3 dB, adjusting minimum detection level to -19.3 dB
[Auto Level] Estimated noise level is -23.6 dB, adjusting minimum detection level to -20.6 dB
[Auto Level] Estimated noise level is -24.7 dB, adjusting minimum detection level to -21.7 dB

Just noise adjustments.

Is anyone familiar with maybe some presets I need to make on Linux? This is my output when running rtl_test -t

adkdeveloper@adk-sensor:~$ rtl_test -t
Found 2 device(s):
0: RTLSDRBlog, Blog V4, SN: 00000011
1: RTLSDRBlog, Blog V4, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R828D tuner
Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
[R82XX] PLL not locked!
Sampling at 2048000 S/s.
No E4000 tuner found, aborting.

[AkaBoing]

try with a fixed gain -g +20, sometimes this works wonder..
rtl_433 -f433.85M -s1024k -g +20 -M level -M protocol -F json >fixedgain.json
pack it and drop it here