Solved it with one little addition to the script, gained from rtl-sdr not working - Any ideas? [obsolete] - Raspberry Pi Forums, one small little deviation, in instructions on this site, it stated
“additionally after the
cmake …/ -DINSTALL_UDEV_RULES=ON
run the command
ldconfig”
I did that but got an error creating the cached, however this works:
git clone GitHub - rtlsdrblog/rtl_biast: Bias tee software for the RTL-SDR.com V3 Dongle
cd rtl_biast
mkdir build
cd build
cmake …/ -DINSTALL_UDEV_RULES=ON -DDETACH_KERNEL_DRIVER=ON
make
cd src
./rtl_biast -b 1
The addition was in the cmake … line.
Now have 1090 mutability working AND 4.7 volts leaving the V3 and powering my LNA. 