They are USB-based RF receivers that in conjunction with free software let you monitor most analog and digital signals. Sounds like you want to hear Fleetnet (OPP, MOH, etc.) and maybe some analog or digital fire departments, all of which these devices do.Thanks Slicer. What is an RTL dongle?I know what a dongle is. I assume they plug into two of my PC's USB ports?
You also can get away with using one dongle, so now you would be down to $25 dollars, lol.
For some reason I can't bring up your original post but I think you were saying you wanted to monitor an Apco 25 digital/analog system. For that I use one rtl-sdr v3 dongle, well worth it for the money.I am going to grab a couple of them, is there a specific software that you guys recommend? Or are they all pretty much the same?
I've run DSDplus and Unitrunker simultaneously feeding the same audio and DSDplus seems much more accurate at decoding trunking data, let alone voice. Perhaps DSDplus can have some Motorola RSS/terminal-style F1/F2/F3 menus. I can't remember command line switches for the life of me. Should post on the Voice/CC decode forum although from the lack of updates, might be a dead/dying project. Getting off topic now.I believe Unitrunker will simultaneously monitor control and voice channels with one dongle if the channels are within a couple of MHz of each other.
Well, like I said, all frequencies I monitor fall within 1Mhz either side of the CC. So using Unitrunker I set the CC and fill in the necessary frequencies and VB Cable send the signal to DSDPlus 1.074 or DSDPlus 1.101 and VLC records everything and is voice activated.May I ask how you're able to steer the single SDR for voice follow on a trunked system? I'd love to be able to do that! Right now I'm using DSDplus and manually tuning via SDRSharp.
This is one feature I'd love to have in DSDplus and/or SDRSharp - the ability for one SDR dongle to track, record and listen to a trunked system with voice frequencies within the range of the SDR swatch. Then advanced features like cascading SDR dongles so they program will use them if necessary to tune to frequencies outside a single SDR stick. In the far future. Sounds simple on paper. lol.