rtl-sdr v4

Hello, dear radio listeners I have a RTL-SDR Blog V4 dongle, which I bought about a year ago. In my region, I have many DES-OFB op25 transmissions and very few unencrypted transmissions. I have tried a few things to be able to listen to the transmissions, but I have not been successful in this...

If I listen to the control frequency I don't hear anything but listening to "alt control 2" I start hearing audio. I'm also hearing traffic and seeing talkgroups from a neighboring city but those aren't even part of the talkgroup aliases I imported from RR? I'm using an RTL-SDR V3 + RTL-SDR V4...

Greetings! I apologize in advance if this is posted in the wrong place. I scoured bot forums of RR, Reddit, Google searching including Youtube but decided to post here as this place has the required knowledge for what I am trying to do - if it is possible. I have an RTL-SDR Blog v4 connected...

I made an spyserver but i have a problem that the minimal frequency is 24 mhz even if the rtl sdr v4 can go lower without direct sampling i think the problem is that it doesnt allow to go lower because rtl sdr v3 cant go lower without direct sampling