MC, May 2024: this document is intentionally given as .txt, for
easier copy-paste.

Installation of DSPIRA software from the very beginning, on
freshly installed Xubuntu 22.04.3 LTS (Jammy Jellyfish). I choose this
instead of Ubuntu itself, because it uses less resource-hungry desktop
environment Xfce instead of oversized and sometimes unstable one,
used in Ubuntu, at least in older versions.

First I download from the Xubuntu mirror the iso image for installation,
which should be uploaded to USB stick through some creator of bootable
disk. I create the Xubuntu partition and install Xubuntu, all "normal"
mode installation, without WiFi connection and third party software.

After we take the installation USB out and do a compulsory restart, we
log in and we will need to update the repository for packages: open
terminal (a convenient shortcut is ctrl-alt-t) and type

sudo apt update

After updates, best is to restart again.

Then we can start with installation of software needed for radio
telescope.

We will need a correct python environment: go to your home directory by
typing:

cd
and press enter.

Now create in editor like gedit or e.g. vi, nano or anything you use-here
with nano editor:

nano .bash_aliases

type there

export PYTHONPATH=/usr/local/lib/python3/dist-packages:/usr/local/lib/python3.10/dist-packages:$PYTHONPATH

and save the file with 
ctrl X

Type exit to close the terminal and open it again with
ctrl alt t
or, without closing it, in the same terminal, type:

source .bash_aliases

and press

enter

Now we go to installation. Type and execute (pressing "enter" after each
line) in terminal each line of the following:

sudo apt install gnuradio gr-osmosdr airspy python3-h5py python3-ephem git cmake liborc-0.4-dev -y

git clone https://github.com/WVURAIL/gr-radio_astro.git

Switch to the gr-radio_astro directory:
cd gr-radio_astro

Switch to the gr-radio_astro 3.10 branch by typing:
git checkout gr310

Create a directory and go into it:

mkdir build
cd build

Run the cmake here:

cmake ..
sudo make
sudo make install

Now let's see if the installation went well.

Type in terminal:

gnuradio-companion
and press enter

Open the spectrometer_w_cal.grc program which is in examples in DSPIRA:

Go to File, Open, gr-radio_astros, examples, DSPIRA, spectrometer_w_cal.grc

We will be using a file which resides in
/home/mikirt/gr-radio_astro/examples/DSPIRA/spectrometer_w_cal.grc

"mikirt" here will be exchanged with path on your machine, so you
need to change a path to output files in the prefix variable (top right
corner) to your desired path, for me it was "/home/mikirt/gr-radio_astro/"

Also, if you do not have the (more expensive) Airspy receiver, you need to
change the device in the flowgraph osmocom source to rtl=0
and the samp_rate (top left) to 2400000, as 10M is too much for cheaper 8-bit
dongle, but if you have one with 10M ability (like Airspy), you are set!

With this, the flowgraph should work like a charm, plug the rtl-sdr dongle into
USB dongle and execute the flowgraph by pressing the arrow "play" in the middle
of the bar above the flowgraph.

A window with spectral line should pop out, increase it and choose 
"unfiltered spectrum with no calibration" and "full spectrum", play
with min and max choice on the left side to see the line.

Note: this is for Linux. If you wish to start from DSPIRA software on USB,
while in Windows, you need to disable fast boot under power options (not in
BIOS settings, but under Windows!). Good luck! On Windows it is probably easier
to use the SHARP SDR package, for which there is much of info available online.