Hello, new here and trying to learn. I was looking to use the control channel for the HCSO and the HCFD but when I got to the page for the info on them ... https://www.radioreference.com/apps/db/?sid=220 ...... the System Frequencies have NO .......... Red (c) are primary control channels | Blue (a) are alternate control channels listed at all. I just got a 2 SDR radio usb adapters and wanted to listen in but I can't find the control channel to use for them. I would be so happy if someone can help me out with getting this working. I have https://www.amazon.com/gp/product/B011HVUEME/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 and this one https://www.amazon.com/gp/product/B01GDN1T4S/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 to use to pull the waves from the air. I have download all the software I need I think as I can get fm radio and weather from here but I can't seem to get this working right to hear the EDACS. I have used sdrsharp to find used freq, then I tried to use unitrunker 18.104.22.168 and DSD+ . I can lock on to what in unitrunker calls EDACS 1 but it doesn't list freq's or anything else and no voices comes threw. see attached pic.