If you're interested; here is my take on, not only this instance, but others who monitor the various Motorola simulcast sites around the country, using anything other than an SDS scanner, a Unication, or an SDR dongle...
I, personally have an SDS-100, two BCD436's, a Whistler TRX-1, a Unication G5 and I monitor via Unitrunker with an SDR dongle (both the Montgomery Co & Butler Co simulcast sites)... (I do not own, or have a BTT, so I cannot speak to that...)
So, my take is this... if a person is using anything other than an SDS-series radio, a Unication, or an SDR; they are missing a LOT of traffic on these systems that they don't even know they are missing. I started monitoring the Montgomery County simulcast site(s) with the 436's I have (excellent radios, btw); had a bit of "garbled" traffic in the beginning; then things would clear up (depending on my current monitoring location), then go right back to "garble". I noticed there were times when things were silent; then things would pick up, then go silent again.... traffic was clear at times, then a bit garbled... frustrating, to say the least... Monitoring was very tedious to say the least; no where near as enjoyable as when things were analog, or on the older TRS.... frustration was even more so on the Butler County simulcast site(s)...
Later on, I pulled the trigger on an SDS-100... and "boom".... traffic was coming in more clear, with a lot more of it.... Shortly afterwards, I incorporated an SDR (with Unitrunker) into my monitoring routine, and this gave me the ability to "visually" compare traffic flow; both on the system and across the SDS-100 and BCD436 radios. I then saw there was a lot of traffic that I had been missing on the 436's. Not because I didn't have the information programmed in to the radios; but, because the radio couldn't "process" it correctly, allowing it to break squelch..... With the SDS and my 436's side-by-side, there is a large amount of radio traffic that the 436's miss, that my SDS will pick up on....
With all that said; I do NOT consider myself a Uniden "fanboy", by any means... for that matter, there are situations that I use my Whistler TRX-1 for that I won't even think of using a Uniden for.... or, I use my Unication. I am a FIRM believer in using the correct tool for the job at hand... and, I am by no means saying that everyone should rush out and purchase an SDS, a Unication, or put together an SDR rig; and that if you do so, your troubles will go away... they are not perfect either; but, they are VERY effective in doing what they do...
I guess what I want to convey is that if someone is using anything other than Unidens SDS- series, a Unication, or an SDR rig (with UT or SDS+) on these simulcast sites; how does one know all the radio traffic they are missing?