dump1090-mutability, piaware, coco antenna, no amp, no filter
I see a lot of tracks with single messages. is this good/bad; if bad is there something I can do about it?
Consensus seems to be that single tracks are typically false hits, as a result of having a lot of noise in your system. You could try reducing your gain. A filter may also be helpful. There’s been some discussion of this here:
ads-b-flight-tracking-f21/rig-back-up-thoughts-on-early-graphs-t36931.html
ETA – As a comparison, I’m running same setup as you. Muta, no amp, no filter, 8 element coco…
In my opinion range/aircraft tracked is a more important metric than the junk single messages. If I lower gain, the noise level and the single-message tracks go down, however range and aircraft tracked also goes down. It is an indication of noise - but as with all RF systems, there’s always going to be noise. The goal is to set up the system so that there’s a good balance.
@jrorci those spikes on your tracks seen graph seem artificially high to me - I see spikes like that when I change a setting in muta and it restarts. Is mutability consistently restarting for you?
No restarts. The one thing I have noticed that may account for that is every now and then I’m able to detect all the LAX traffic, includIng the planes on the ground. They all appear for a short while, then poof. I’m in a valley/canyon. With LAX over the hill…Wish I could get those consistently.
Easy to get those constantly, just get an antenna up on the hill 
Not sure why you’re picking them up intermittently - maybe knife-edge propagation, or I wonder if it could be so simple as an aircraft or something the signals are bouncing off of. Not sure if that’s a thing that happens.
I get the same thing with AC at LGA and EWR. 10-30AC on the ground for a while then they disappear.
Your Single Message Tracks look pretty good to me.
Which collectd are you running? your signal graph is different from mine. I ran Joe’s adsb-receiver scripts.
I’m using collectd via github.com/tedsluis/dump1090-tools