**Your mileage may vary, but I’d take that noise level with a grain of salt.
What’s happening with the noise floor reporting with my rig is interesting. I’m running the FA antenna pretty nicely situated up above the roofline, but still sub-ideal as it’s on the side of my building, not at the tip of the peaked roof. (although, for an apartment, it’s really not bad)
After installing the prostick the daytime noise floor is being reported as -15dB with the gain at 42 up from -25dB on the old dongle with no amp and the gain at 48.
The NIGHTTIME noise floor is down to -35dB down from -30 with the old dongle.
Message rate is up to 13-1400 from 1000-1200. Unique tracks are up, range is up, ac tracked is up - and single message tracks are DOWN.
(I wish I had better comparison graphs to illustrate - I had to re-image my card and the backup is a week old. Comparison charts not so stark)
Anyway - I’m not sure what the reported noise figure is actually a function of - but I have a feeling what’s reported is artificially high and is coming from the sheer volume of messages coming in. I’m not sure it’s “noise” per se, I think it’s just a lot of overlapping messages.
even during periods where the noise floor is being reported as -15dB I’m tracking aircraft cleanly down to -25 even -27dB RSSI.
Also a telling statistic: Even with the increased message rate, cpu usage is slightly down, or maybe just flat. but still.
New york is very busy airspace, and with this setup i’m averaging over a million position reports a day - I’m still a bit of a noob at this, but I think that a lot of what is reported as noise are actually just overlapping messages. I was a little unnerved by the noise figures at first, but the other numbers don’t lie.
I may restrict access if y’all crash my pi, but if you want to see the graphs: radarcontrol.woodside.jonhanford.com