I'm looking to set up a standalone 978 receiver (probably Pi 3 or 4 w/Rtl-SDR). Got the hardware handled - but I can't tell if the documentation I'm finding online is still current. Can I just take the current standard image from the ADSBexchange website and modify the config settings to change it to 978, or are there still additional utilities that need to be downloaded? Thanks
Long story short, I want to create it as a test to see if I can get it running, and then probably relocate it. I just don't want to dedicate two receivers and/or antennas to the project at the moment. Just want to keep it simple
You don't need 2 antenna or Pi. Just 2 SDR. But maybe ... it likely work out of the box with ADSBx image on 978 only.
In my case I just started with ADSBx and only the one 1090 SDR. I have the 1090 / 978 antenna. So I am guessing I need a splitter (recommendations?) and then just plug it in and reboot? How will I assure it is running once I do that?
I use something like this. https://www.amazon.com/Bingfu-Antenna-Splitter-Cellular-Amplifier/dp/B07STYNB6V/ You'd need to add a SDR without 1090 filter, then set serials, seto the 1090 serial to 1090, set 978 SDR serial to 978 Do it one at a time, unless you know what you are doing. Plug in 1090 SDR, set it. Unplug and put in 978. sudo rtl_eeprom -d 0 -s 1090 sudo rtl_eeprom -d 0 -s 978 My feeder. https://globe.adsbexchange.com/?fee...O5gTOWfGhnnLeFnDvjqwGY5q8pW2FqH/3l12wT/kqg5dG
You need to stop the services that use the SDRs before setting the serial: sudo systemctl stop readsb sudo systemctl stop dump978-fa
So with the existing one 1090 SDR in run (stop the services): sudo systemctl stop readsb sudo systemctl stop dump978-fa then run: sudo rtl_eeprom -d 0 -s 1090 remove 1090 SDR, insert 978 SDR run: sudo rtl_eeprom -d 0 -s 978 put BOTH SDRs back in then just reboot to get things running again?
Yes pretty much. You can run this command as well to make sure dump978-fa will only grab the correct SDR: Code: sed -i --follow-symlinks -E -e 's/--sdr +[^" ]*/--sdr driver=rtlsdr,serial=978/' /etc/default/dump978-fa When did you download the image? sudo nano /boot/adsbx-env Check that the line with 1090 has the # in the front removed: #RECEIVER_OPTIONS="–device-type rtlsdr –ppm 0" RECEIVER_OPTIONS="–device 1090 –device-type rtlsdr –ppm 0" If you didn't load the image in the last 2 month or so .... you should probably also run this: Code: sudo wget -O /usr/local/share/adsb-exchange-978/convert.sh https://github.com/adsbxchange/adsbexchange-978/raw/master/dropin.sh sudo wget -O /usr/local/share/uat2esnt https://github.com/adsbxchange/adsbexchange-978/raw/master/uat2esnt sudo chmod a+x /usr/local/share/adsb-exchange-978/convert.sh /usr/local/share/uat2esnt sudo reboot Anyhow ... if you have any issues just come by in the discord https://discord.gg/UEXSqDh
Logic says no need for that section i mentioned then. The 2nd thing you can check regardless, not too complicated.
Finally got around to trying this. Followed each and every step you mentioned above, but when going to the 978 page I still get: And I notice in the reboot sequence I see some lines about 978 service stopping / stopped. What should I be looking at here? FYI 1090 still works fine.
After having inserted the splitter and having the two SDRs in for a day or so, I noticed that my signal level on 1090 decreased dramatically. I would not have expected this little splitter to cause this much loss. I removed it and the signal strength went back up. Example Evidence: Is this expected?
Well splitting a signal halves it, thus raise the gain on your SDRs. Y-splitter is fine, just need to adjust SDR appropriately. https://globe.adsbexchange.com/?feed=pJPFv6BrUZvZ%2FoSyWe9O5gTOWfGhnnLeFnDvjqwGY5q8pW2FqH%2F3l12wT%2Fkqg5dG Above is FA Blue, FA Orange with SMA splitter like above.
It still shouldn't be a change of more than 9 dB, this looks more like 20 dB? Or maybe this is normal for those splitters and not an issue, i'm not really familiar. Have you tested what the graph looks like if you remove the splitter james?
Bingfu sells that terrible mag mount antenna that is deaf. The ones I use are custom made from a cable guy. But should be the same, roughly.
Not sure what you mean by "...just need to adjust SDR appropriately." I am using the FA Blue SDR for 1090. Also to wiedehoph's question, do you gain 20db without the splitter?
I was talking about the difference on the graph you showed. But ... just adjust the gain accordingly and see how much range you lose and if that's acceptable. More result oriented than comparing the signal graphs.
