OP25 Bias T

[Jason1313]

Does anyone know how to enable bias t in multi_rx.py. I assume you would add something to the .json file. I have it working for the single dongle config by adding this 'rtl=0,bias=1' thanks for any help.

 

[wgbecks]

Try formatting your device section per the example below. The args work with rx.py and I am pretty sure
they will also work with multi_rx.py.

"devices": [
{
"args": "rtl=0,bias=1",
"gains": "LNA:39",
"gain_mode": false,
"name": "sdr0",
"offset": 0,
"ppm": 0.0,
"rate": 1000000,
"usable_bw_pct": 0.85,
"tunable": true
}

Otherwise, you can run rtl_biast from the command line or as part of your shell script used to start multi_rx.py.
IE: rtl_biast -d 0 -b 1 (enable) -or- rtl_biast -d 0 -b 0 (disable). Additional reference: man rtl_biast

Bill

 

[boatbod]

The content of the "args" parameter functions exactly the same in rx.py and multi_rx.py because it is passed through seamlessly to the gr-osmosdr driver.

 

[Jason1313]

So I used your example and added it to devices and works perfectly. Thanks for the help, much appreciated!