I am now using 6 RTL-SDRs with SDRTrunk. This means that I can tune quite a large bandwidth simultaneously.
I have observed the the SDRTrunk spectrum display appears to set the first frequency activated on the first receiver as the center of a 2.4 MHz bandwidth and the plots all other activated channels accordingly. The center can move until any 2.4 MHz spectrum swath is in use within range of the first receiver and channel, with the highest frequency being at the rightmost edge of the display. This means that, with more than one physical receiver, most channels tuned are not visible on the spectrum and waterfall.
Would it be possible to have SDRTrunk evaluate all activated channels and then generate a spectrum/waterfall display that is wide enough to show all of them?
I can imagine that a limitation of being within a certain band might be necessary, such as having to be all UHF or all 800 MHz.
73 de Dave, NF2G