Rtl_433 doesn't show any data

General
1

I just got the rtl-sdr blog v4. I am running on a Raspberry Pi 5 with trixie.

I have installed the v4 drivers, using the “Alternative Debian Package Installation Method”.

I have built rtl_433 from merbanan/rtl_433 master.

cubicsdr seems to think that there’s activity at 433mhz

rtl_433 reports:

rtl_433 version 25.12-8-g8d92cdd6 branch master at 202601061318 inputs file rtl_tcp RTL-SDR
Reading conf from “rtl_433.conf”.

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

[Protocols] Registered 265 out of 291 device decoding protocols [ 1-4 6-8 10-17 19-26 29-64 67-73 75-175 177-258 260-265 268-275 ]
rtl_433: warning: 106 “Wireless M-Bus, Mode R, 4.8kbps (-f 868.33M)” does not support CSV output
rtl_433: warning: 107 “Wireless M-Bus, Mode F, 2.4kbps” does not support CSV output
[Input] The internals of input handling changed, read about and report problems on PR #1978
[SDR] Found 1 device(s)
[SDR] trying device 0: RTLSDRBlog, Blog V4, SN: 00000001
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: 1000000.026491 Hz
[SDR] Sample rate set to 1000000 S/s.
[Input] Bit detection level set to 0.0 (Auto).
[SDR] Tuner gain set to Auto.
[Input] Reading samples in async mode…
[SDR] Tuned to 915.000MHz.
Allocating 15 zero-copy buffers
[Baseband] low pass filter for 1000000 Hz at cutoff 200000 Hz, 5.0 us

but never finds anything.

My old NooElec R820T SDR & DVB-T NESDR Mini sees packets at 433 Mhz

time : 2026-01-26 19:45:35
model : Sharp-SPC775 id : 160
Battery : 1 Temperature: 15.4 C Humidity : 128 %
Integrity : CRC

(It doesn’t see anything at 915mhz, which is why I bought the blog v4. It used to…)

Anyway, am I missing something?

I’m using the short 60mm antennas on the dipole holder that came in the bundle (Amazon.com: RTL-SDR Blog V4 R828D RTL2832U 1PPM TCXO HF Bias Tee SMA Software Defined Radio with Dipole Antenna Kit : Electronics).

2

Drivers appear to be successfully installed.

Does the V4 see activity at 433 MHz? In the terminal paste provided you are tuned to 915 MHz.

Are you sure the signal you’re after is exactly at 915 MHz? This band stretches from 902 to 928, so you might be missing the exact frequency of the active signal.

3

I did not see anything at 433. I waited to answer until I got a muzi 915 mhz whip to give it a fair shot. It still does not see anything at 915mhz, while I see strong and frequent decodes with the older one. I guess I’ll be sending it back. :frowning:

time      : 2026-02-01 16:17:07
model     : AradMsMeter-Dialog3G                   Serial No : 00000000�
Volume    : 0.0 m3
Modulation: FSK          Freq1     : 914.9 MHz     Freq2     : 915.0 MHz
RSSI      : -2.8 dB      SNR       : 10.7 dB       Noise     : -13.5 dB
[Auto Level] Current noise level -13.6 dB, estimated noise -13.6 dB




time      : 2026-02-01 16:17:19
model     : AradMsMeter-Dialog3G                   Serial No : 00000000�
Volume    : 0.0 m3
Modulation: FSK          Freq1     : 914.9 MHz     Freq2     : 915.0 MHz
RSSI      : -4.0 dB      SNR       : 9.9 dB        Noise     : -14.0 dB




time      : 2026-02-01 16:17:19
model     : AradMsMeter-Dialog3G                   Serial No : 00000000�
Volume    : 0.0 m3
Modulation: FSK          Freq1     : 914.9 MHz     Freq2     : 915.0 MHz
RSSI      : -4.0 dB      SNR       : 9.9 dB        Noise     : -14.0 dB