A subreddit for the low-cost, DIY software defined radio (SDR) community. While originally dedicated just to the project, relevant legal content related to general SDR, RF and similar projects is also welcomed. Feel free to ask questions but please. Rtl-sdr 'rtl-sdr' is a generic term for cheap USB digital TV (DVB-T) receivers that use the Realtek RTL2832U chipset, which can function as general purpose software defined radios (receive only).
All rtl-sdr compatible devices employ the RTL2832U as an ADC and USB controller, but different RF tuners may be used. Note that rtl-sdrs do not transmit! Typical specs (some depend on specific tuner): • Cost: ~$5-45 USD • Frequency range: 24 - >1760 MHz (100 KHz - 24 MHz in direct sampling mode) • Max sample rate: 3.2 MS/s (2.6 MS/s in practice) • Resolution: 8 bits/sample • Noise figure. Take a look here: What agency/system are you referring to? Forgive me, but I've run across many instances in the past where folks confuse digital voice with 'encryption' Best case scenario you need to look at using software like DSD+ with your RTl SDR dongle. If its truly encrypted voice your ability to crack the crypto is probably going to be quite an undertaking. There are some references to breaking encryption on a P25 system that I have come across.
However if the agency in question changes the 'keys over the air' routinely its going to be a whole lot more trouble. As far as I know there are no 'stand alone' apps which can do the job for you. Most of the research I have seen regarding breaking voice crypto has been very technical and requires more than an above average understanding. (Proof of concept code is usually self censored by the researchers to protect from malicious abuse) I'm not saying 'give up, its not worth your time.' Although you might be unsuccessful in you endeavor to listen to 'encrypted' transmissions you might learn a few things along the way. One final note: In the US there may be legal ramifications to consider with breaking encrypted law enforcement traffic.
Hytera Awarded TETRA Projects by Shenzhen Metro; Hytera Supports Le Mans Racing Team with DMR Radios; Hytera on track in Chile: Metro de Santiago chooses TETRA from. Ok, I live in Garfield County WA. They decided to encrypt all data over radio. Is it illegal for me to decrypt it? Is it illegal. Details about the Two-Way Radio Encryption feature of two-way radios. 2-Way Radio Encryption. One of the more secure encryption techniques is called P25. OP25 is a not-for-profit project to bring together folks that are interested in implementing APCO P25 using a software-defined radio. Decrypt P25 Radios Police Radio Encryption: Not Secure, A Transparency Failure, A Public Safety Nightmare. Ask any security expert, and they’ll mention PRINCIPLE ONE: A security system is only as strong as it’s weakest link. Primaria Voluntari Taxe Si Impozite Program Pro.