Almost certainly a walkie talkie / emergency services idler. Most all of these are around the 450 MHzMegaHertz (MHz) 10^6 Hz band. Listening mode is NFMNarrowband Frequency Modulation --LV (talk) 03:16, 15 July 2016 (NZST)
This is what LTR standard system sounds like (just with the mic keyed)Ywsia1
