Ok. I asked Keith this “I don’t know what you mean by P25? My understanding was it’s (the 166.25 MHz a single channel repeating the FD audio in analogue.” His response was “Yes with a P25 mobile connected to a 166.25 radio.”
So, I’m still not getting it... my assumption has always been this type of rebroadcast was simply taking the the audio from an external speaker jack of any system, it matters not digital or analogue, and rebroadcasting it, in this case over an analogue VHF High band frequency. Why Keith even mentions P25 is confusing the issue. Perhaps he is reading more into my question than was intended?
Going forward, I will set up my SDS200 to receive 166.25 in Analog Only.