I know that 144-148 and 156-157 mhz ranges are in use, and various fire/ems/police, but outside of that, I see a lot of earth-to-space, weather stuff and space research allotments (talking about Canada here). Outside of using a scanner, is there any way to know if the metrology / space / satellite allotments are in actual use in a particular area?
In my experience the parts allocated to PMR are extremely busy, it's the most popular band for walkie talkies and car radios, best compromise between antenna length (60 MHz is quite bulky) and path loss + diffraction (450 MHz is not as nice).
But busy doesn't mean 0.5 Erlang, because analog FM and Push To Talk are so inefficient.
Without actually analysing the traffic yourself, you could:
- look for research papers that do just that, in a similar city
- try to find the allocations from the spectrum management authority. If they're not already public information, It's possible you could retrieve the entire list of allocations, perhaps anonymised, with an FOIA request or similar. Bear in mind that allocated will just mean someone is paying for their spectrum license, not necessarily using it.
Canadian frequency spectrum allocations can be found here: http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf10759.html#t2 Hope this helps.