rtl_biast(1)

NAME
rtl_biast - a tool for turning the bias tee or any GPIO on and off

SYNOPSIS
rtl_biast [OPTIONS]

DESCRIPTION
Switch the bias tee power supply of an RTL2832 based receiver on or off. Many receivers provide a bias tee to feed DC power out over the antenna connector, for example to supply an external low noise amplifier or an active antenna.

The bias tee is driven by GPIO 0 of the RTL2832. Receivers that wire it to a different pin, or that expose further GPIOs, can be controlled with the -g option.

The setting is not reset when rtl_biast exits. The bias tee stays in the state it was left in until it is switched off again, either by another call to rtl_biast or by a client program that disables it explicitly.

OPTIONS

-d device_index or serial (default: 0)

-b bias_on (default: 0)

-g GPIO select (default: 0)

EXAMPLES

To turn the bias tee of the first device on, call
     rtl_biast -d 0 -b 1

To turn it off again, call
     rtl_biast -d 0 -b 0

To switch GPIO 1 instead of the bias tee, call
     rtl_biast -d 0 -g 1 -b 1

SEE ALSO
RTL-SDR wiki documentation: http://sdr.osmocom.org/trac/wiki/rtl-sdr

Other rtl-sdr programs:

rtl_adsb(1), rtl_eeprom(1), rtl_fm(1), rtl_power(1), rtl_sdr(1), rtl_tcp(1), rtl_test(1)

AUTHOR
This manual page was written for the osmocom rtl-sdr project.

COPYRIGHT
Copyright (c) 2012 Steve Markgraf <steve@steve-m.de>

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.