jeroenbeijer
commented
3 years ago It uses the same gain index that rtl_tcp uses which you can pass there at start up. So basically the index in this list for a regular RTLSDR V3:
valid tuner gains r82xx_gains[] = { 0, 9, 14, 27, 37, 77, 87, 125, 144, 157, 166, 197, 207, 229, 254, 280, 297, 328, 338, 364, 372, 386, 402, 421, 434, 439, 445, 480, 496 };
To select the highest gain the index would be 28. Thanks for pointing this out, I have updated the readme.
Trying out the remote RTL setup I found the gain was way too low by default, and the rtl_tcp server gain had very little effect. The parameter "remote_rtl_gain_idx" is not documented but appears to work, but I'm not sure what the units are for this?