RTL-SDR Dongle in Linux
I wanted to get a better idea of how the dongle gain was manipulated through software. To do this I first got rtl-sdr and SDRSharp running on my Linux machine.
I plugged the dongle into my laptop and ran
lsusb. The following is the output.
Bus 003 Device 005: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T
The vendor and PID numbers match up with this entry on the rtl-sdr page:
0x0bda 0x2838 E4000 ezcap USB 2.0 DVB-T/DAB/FM dongle
The installation of the udev rules doesn't seem to work properly in the instructions above, but you can follow these.
The kernel also automatically loads the dvb driver module for the dongle to make it available as a TV tuner. This causes
rtl_test -t to complain that something is already using the dongle. You can blacklist the offending module in
/etc/modprobe.d/blacklist.conf with the line:
For a quick kill of the driver you can just do:
SDRSharp should be able to access your dongle then.
What it looks like is that it's rtl-sdr, not SDR# that adjusts the gain of the internal preamp. From what I see in the repo SeeDeR uses rtl-sdr, so it should be possible to adjust the gain through the library without writing code to directly talk to the dongle. Tim and Scott may already know this. I'll start a thread on the forum to ask.