Thanks, the heatmaps are obvious, it’s the elevation plots I need to get my head around.
The heatmap will be useful as it’ll give me a good indication of which corner of the mast I want to mount the feeder when I lower it back down again as I’ll be blocking off a chunk of the sky. Comparing one after I lower it will be very interesting to see. I’m thinking I want the blocked area to be slightly east of NE if I can manage it.
Think of it as a panorama of the whole horizon - here’s a timelapse view of the same thing that lets you see how aircraft move from that viewpoint. It may or may not make it clearer. Aircraft are coloured by altitude in this:
https://streamable.com/m6oav
caius, this is just too good. i keep watching and watching…well done!
I’ve installed timelapse and added a new entry to cron.
40 23 * * * sudo bash /home/pi/heatmap/polar.sh -1
Thanks. I’ll upload the script to do this at some point, but it’s a bit messy at the moment. It also will take an absolute age (many hours) to run on a pi, if it does at all. It takes long enough running it on my desktop machine which is a quad core i5.
Such heatmap looks impressive
Is it rocket science to create it? Would do it for my site as well
I followed the installation steps, but get an error while trying to run the packages (last two entries in the instructions):
sudo dpkg -i ./gnuplot-data_5.2.6+dfsg1-3_all.deb
sudo dpkg -i ./gnuplot-nox_5.2.6+dfsg1-3_armhf.deb
This gives error (translated it says that the archive is not a known Debian archive format) for both packages:
> dpkg-deb: Fehler: »./gnuplot-nox_5.2.6+dfsg1-3_armhf.deb« ist kein Archiv im Debian-Format
> dpkg: Fehler beim Bearbeiten des Archivs ./gnuplot-nox_5.2.6+dfsg1-3_armhf.deb (--install):
> »dpkg-deb --control«-Unterprozess gab den Fehlerwert 2 zurück
> Fehler traten auf beim Bearbeiten von:
> ./gnuplot-nox_5.2.6+dfsg1-3_armhf.deb
Any ideas?
Edit:
I think i found the error. The archive on Debian Repositories are lot larger, mine are only having 323 bytes on disk.
You don’t need to manually download/install the packages on Buster.
just do:
sudo apt install gnuplot-data gnuplot-nox
Too fast, i did it the hard way.
Works now 
EDIT :jq was missing, script ran into the error. Fixed by manually installing jq. Not sure if i missed it in the install instructions
My very first heatmap, for testing purposes only 10 minutes with 5 seconds frequency:
Not very interesting so far, but it’s working!
zoomed in:
Good stuff, it proves it’s working.
correct and i really appreciate that somebody is doing such awesome scripts
Thanks to @caius and @wiedehopf
Normally my wife is not interested in that kind of stuff, but she think already about creating a sort of art for our living room
Does raising the antenna require any gain changes? I’m wondering if adding in the longer cable might warrant a change.
I haven’t changed the gain and in this situation, there’s no difference in cable length because it’s all self contained in the box you see.
If I decide that I’m going to fix a new FA aerial on top of my hexbeam then I will be introducing a run of coaxial cable, probably 4-5m long. Once it’s finalised then I’ll look at gain.
You check the graphs and go from there.
Unless one of the cables is really bad, i wouldn’t expect much change if any.
keithma is using the Airspy, so gain is much less critical.
Did you put only the LNA on the box at the top of the mast, or the LNA and the Raspberry Pi too ?
Do you have picture of the inside box ?
Thanks for the info !
Why the two LNA ?
