In order to use single receiver mode, do all the voice channels and the control channel need to be in the same bandwidth of the dongle? For example, if I’m using a regular RTL-SDR, do all the freqs need to be within 2.4 MHz? Or does it work like OP25 where it stops monitoring the control channel while a voice transmission is in progress?
A modern scanner, even the most expensive models from Uniden and Whistler (GRE in the past), still only has one receiver circuit so even with the latest advances and code and SoCs and other things related to the reception and decoding aspects of control channels so it's literally hopping from the CC aka Control Channel frequency to whatever the assigned frequency is for the next VC aka Voice Channel happens to be. It does it seamlessly and very well but it's still just doing one thing at a time. The moment a VC ends activity it goes back to receiving the CC data stream and then hops again whenever a new VC is assigned, over and over again, with very little lag in the process.
So, now that this upgrade to DSD+ is here, it's basically doing the same thing even in spite of the fact that for us that use SDR hardware, and if there's enough bandwidth meaning the window into what the tuner can receive is wide enough, can literally "listen" to several MHz of activity in real-time and capture all of it. I'm pretty excited about this upgrade as I've held off on joining the Fast Lane for years now, been using the standard public release of DSD+ because it does what I need it to do.
If I were still living in Las Vegas I more than likely would have upgraded years ago but in my current area - Springfield MO - there's not a whole helluvalot of activity here, no P25 Phase II that I'm aware of, but the Missouri State Police are on a huge system using P25 Phase I so it'll be useful even so and with DSD+ support P25 Phase II now (something I just discovered a few days ago, thankfully) I'll have that option now as well since the much older public release aka "the free version" doesn't do P25 Phase II.
Should have joined Fast Lane years ago, just kept putting it off but now that it's done I need to see about getting an RSP1a soon and get back into the hobby more than I have in the recent past as well.
This is a very good thing, absolutely, and it's been a long time coming for those of us that still tend to stick with using the "cheap USB TV tuners" for various purposes that had hoped someday someone would write some crazy awesome code to basically make one app that
can allow for almost scanner-like capabilities meaning just one tuner, one app, even trunking capable.