Found RTL Scanner (RTL Spectrum Analyzer) and thought it may be useful to some of you.
It is a free download at https://eartoearoak.com/software/rtlsdr-scanner
Available for Windows, Linux (RPi) and MAC
I installed the WIN 32 version https://github.com/EarToEarOak/RTLSDR-Scanner/releases/download/v1.2.2/rtlsdr_scanner-setup-win32.exe
The program needs a fairly powerful machine - is a little tough to learn and use - maybe a little buggy but looks like it could be valuable to see what is going on around your location.
This is the 1080 to 1100 spectrum here near Orlando International Airport (MCO) - My location is close to the airport so there is a lot going on here. It took a couple minutes to run the sample.
This shows the plots over time. In my case I used 10 plots with a single frequency dwell time of 32 ms. It shows great variability of the 1090 signal over time as you would expect from all the nearby aircraft being received.
This plot is the comparison between the FA pro dongle and the FA Pro+. There really was not much difference at these frequencies - except for the variation in radio traffic over time. Blue is Plot1,Green Plot 2 and Red the compare.
A wider range of frequencies verified the bandwidth of the Pro+ dongle. There seems to be a lot of spurious signals but the general view is useful. Was not able to use the comparison feature at this frequency spread.
Took some time and experimentation to figure this all out but it is a very interesting tool. The RTL dongle itself causes some of the unusual effects with stray images and spurious signals etc. Hope this is useful and helpful.
