SDR Direct Sampling mode

[habub]

Hi,
I have an SDR device which supports direct sampling mode (aka Q-branch).
Can I activate this mode through RTL_433?

[zuckschwerdt]

Yes, the -t option supports the usual RTL-SDR options:
direct_samp[=1], offset_tune[=1], digital_agc[=1], biastee[=1]

  [-t <settings>] apply a list of keyword=value settings for SoapySDR devices
       e.g. -t "antenna=A,bandwidth=4.5M,rfnotch_ctrl=false"

We should add that to the help ;)

[habub]

Thanks.
So I just add -t "direct_samp=1" in the command line?
Where can I find the available -t options? Since they're not in the help...

[zuckschwerdt]

They are now ;)

  [-t <settings>] apply a list of keyword=value settings to the SDR device
       e.g. for SoapySDR -t "antenna=A,bandwidth=4.5M,rfnotch_ctrl=false"
       for RTL-SDR use "direct_samp[=1]", "offset_tune[=1]", "digital_agc[=1]", "biastee[=1]"

[habub]

Thanks for the quick turnaround.
But were can I get a full list of supported settings and their values? I couldn't find any reference in soapy or other repo.
Also, when using "direct_samp" I didn't get feedback if it worked. I used any value (=1, 2, 3, etc.) they were all accepted.

[zuckschwerdt]

It's just the RTL-SDR options. Booleans except direct_samp, which is 0: Off, 1: I-ADC, 2: Q-ADC.
https://github.com/pothosware/SoapyRTLSDR/blob/master/Settings.cpp#L562
https://github.com/osmocom/rtl-sdr/blob/master/include/rtl-sdr.h#L295