I have ADS-B and AIS tracking running on a Pi4, with two dongles and everything seems good.
We recently went on a holiday to Rotterdam - perfect place for boat tracking - so I installed AIS-Catcher on another Pi, took the AIS dongle and got a decent reception.
When we got back, I left the second Pi set up inside, and got more responses than I had before.
I’ve tried rtl_test -d on both Pis, and the PPM results are very different. The dongle on the indoor Pi is in the high 30’s, the outdoor is reporting negative PPM.
Could having two receivers on the same Pi affect the reception?
Possibly the ppm change you experienced is due to change in ambient temprature (outdoor vs indoor installation).
If you feel that the cause of ppm change is due to running both dump1090-fa and AIS-catcher on same Pi with 2 dongles, you can easily verify this by temporarily stopping dump1090-fa and unplugging 1090 dongle, then measure the ppm of AIS dongle.
Temperature could be a good shout. The outdoor box is made to be waterproof, and the temperature in the definitely higher than in the house. Will have to look at how to add ventilation and tidy up the cabling, thanks for the idea.
Yes, I tried unplugging the 1090 dongle and running rtl_test on it too, but didn’t get anything conclusive, hence the question.
