a very good and stable 5V supply is important. This does not only concern the power supply but also the USB cable. Here are very bad cables on the market. I cut the USB connector and solder a 1mm² cable to it. A good alternative is the Odroid C4, this is powered with 12V which makes the supply much easier.
Here is the installation on a Raspberry PI 4, from the beginning.
Writing the Raspi OS image to SD card.
in this example was used:\
2021-05-07 Raspberry PI OS 32 bit
(with Disktop or with Desktop and recommended software)
(I recommend to connect via network cable, in the beginning a lot of updates are loaded, this can take a long time via WLan)
Installation of the QO100 Transceiver
Enter these commands, as described in the chapter “Installation”:
wget https://raw.githubusercontent.com/dj0abr/QO100_Transceiver/main/install chmod 755 install ./install
Connecting the Pluto.
Plug the Pluto with the included USB cable into the USB 2.0 port of the Raspi (black USB connector).
the following is VERY important, it can take a while until the Raspberry recognizes the Pluto. If this does not work, unplug the Pluto.
Now you have to wait a bit, then check with this command if the Raspi has recognized the Pluto:
The output looks something like this:
pi@raspberrypi:~ $ iio_info -s Library version: 0.21 (git tag: 0cbeeca) Compiled with backends: local xml ip usb Unable to create Local IIO context : No such file or directory (2) Available contexts: 0: 0456:b673 (Analog Devices Inc. PlutoSDR (ADALM-PLUTO)), serial=10447384b904000a1100280045e5da6f73 [usb:1.4.5]
especially the output of [usb:1.4.5] at the end of the line shows that the Pluto was detected correctly.
You should not start the transceiver software until the Pluto has been detected by the Raspberry.
Start the transceiver
by entering ./startQO100trx
the software starts by default with USB, so the Pluto will be recognized immediately.
The sound card is also immediately set correctly on the Raspberry PI.
The picture now looks like this:
In SETUP you still have to enter the receive and transmit frequency, click OK, and the spectrum of QO-100 is displayed immediately.
in the picture Pluto is free-running (without GPS), so the spectrum is slightly shifted.
If you don't use GPS for Pluto, first do calibration 439, see here SETTING THE REFERENCE FREQUENCY.
After this adjustment the spectrum will be displayed correctly:
For audio device selection, see Sound card on the page: Sound setting