Decoding a 315 Mhz remote

[László Monda]

Hi guys,

I'm trying to capture the output of a 315 Mhz remote, but nothing shows up after entering the `rtl_433 -f 315000000` command.

$ rtl_433 -f 315000000
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/laci/.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 ]
Detached kernel driver
Found Rafael Micro R828D tuner
Exact sample rate is: 250000.000414 Hz
[R82XX] PLL not locked!
Sample rate set to 250000 S/s.
Tuner gain set to Auto.
[R82XX] PLL not locked!
Tuned to 315.000MHz.
Allocating 15 zero-copy buffers
baseband_demod_FM: low pass filter for 250000 Hz at cutoff 25000 Hz, 40.0 us

My RTL-SDR v4 is working well because it captures the signal in Gqrx.

Thanks in advance for your help!

[Christian Z.]

nothing shows up after entering the `rtl_433 -f 315000000` command.

It's not supposed to. Due to popular demand rtl_433 is now very quiet by default. You need -v or -vv to show what's going on. And as always -A to show a breakdown of unknown data.

See https://triq.org/rtl_433/ANALYZE.html for more.

 

[László Monda]

Thanks for your help, Christian.

In the meantime, I've downloaded the nightly rtl_433 202403021530 version to ensure I'm not missing anything.

I have three remotes. Gqrx visualizes all of their signals, and none of them are decoded by rtl_433. Even when using `-vv -A` , nothing gets displayed, which is suspicious.

Attached are the recorded samples. Can you give me an idea of what the problem is?

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László Monda
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[Christian Z.]

The sample files don't contain any signal. There is a suspicious emtpy first half then just static noise. Try them on https://triq.org/pdv/ and compare to other samples from https://github.com/merbanan/rtl_433_tests

I guess something is wrong with receiving signals, try to record a longer time, maybe on other frequencies and see if you can get a waterfall spectrum with something in it that looks like what Gqrx shows.

Also 315 MHz seems odd. I'm not aware of any legal use of that band in europe?

[László Monda]

I've tried rtl_433 on macOS; unlike Linux, it just works.

Linux gives me a hard time when it comes to rtl for some reason, just as in the case of Gqrx.

I won't bother making rtl_433 work on Linux. Thanks for your help!

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[Christian Z.]

What hardware do you have? Is the receiver perhaps a very new Blog v4? Then you'd need an updated librtlsdr.

[László Monda]

I've purchased this AliExpress product.

It has RTL SDR Blog v4 written on it, but I don't know whether it's considered to be "very new".

On Sun, Mar 3, 2024 at 2:48 PM Christian Z. <chri...@zuckschwerdt.org> wrote:

What hardware do you have? Is the receiver perhaps a very new Blog v4? Then you'd need an updated librtlsdr.

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[Christian Z.]

It won't be genuine but perhaps has the same requirements. You'll then need the 2.0 (2.0.1) version of librtlsdr (Debian / Ubuntu have this as "librtlsdr2"), the older 0.6 version ("librtlsdr0") won't work. Available only form Debiantrixie/sid and Ubuntu noble onwards.

[László Monda]

I'm running Linux Mint 21.3, which contains librtlsdr 0.6.0-4, which may explain this issue. My distribution doesn't have a more recent version of this package. I think I'll wait to upgrade the distro later and use the Mac in the meantime.

I assumed that RTL SDR Blog v4 sold on AliExpress is the same hardware as sold elsewhere. I would have much rather supported an original device, assuming that they contribute to development.

On Sun, Mar 3, 2024 at 3:32 PM Christian Z. <chri...@zuckschwerdt.org> wrote:

It won't be genuine but perhaps has the same requirements. You'll then need the 2.0 (2.0.1) version of librtlsdr (Debian / Ubuntu have this as "librtlsdr2"), the older 0.6 version ("librtlsdr0") won't work. Available only form Debiantrixie/sid and Ubuntu noble onwards.

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[Christian Z.]

I did judge too early since I couldn't find the store info (published at https://www.rtl-sdr.com/genuine/) on the buy page you linked.

But if I follow a link from the official store https://de.aliexpress.com/store/4523039 I do land on the same page.

The next version of Linux Mint, 22 "Wilma", will be based on Ubuntu 24.04 LTS version "Noble". It might be released June or July 2024.

[László Monda]

I appreciate your findings, but I won't spend more time on this because I rarely use rtl_433.

Thanks for your help!

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