Pseudonymous YouTuber “High DNG” has demonstrated how a Raspberry Pi 5 and an RTL-SDR software-defined radio dongle might be became a radio scanner for digital radio transmissions, together with these utilized by emergency companies — duplicating the performance of $600 off-the-shelf {hardware} at a far decrease value.
“The digital P25 radio from Uniden is possibly 600 bucks,” High DNG explains, “and I do not actually care to pay that a lot for that. So, to choose up these type of alerts on a budget you get one in every of these dongles: the RTL-SDR. These are, like, 30 bucks, however in fact the issue with these is that they want one thing to plug into, and you have to run some software program — it is not all contained in right here, that is simply the dongle.”
The answer, to be used on-the-go not less than, is to attach the RTL-SDR dongle — a low-cost receive-only software program outlined radio — to a single-board laptop. In High DNG’s case that is the brand new Raspberry Pi 5, launched late final 12 months as probably the most highly effective Raspberry Pi by far and simply as much as the duty of driving the RTL-SDR dongle and decoding the transmissions it receives.
“I do know some folks have tried to do that earlier than with Raspberry Pi 4s,” High DNG explains, “and so they simply weren’t highly effective sufficient. So with the [Raspberry Pi] 5 we’re unlocking this [type of] transportable scanner [functionality] on a budget.”
The Raspberry Pi 5 connects to the RTL-SDR over USB, whereas an HDMI touchscreen show offers a consumer interface. Audio system constructed into the monitor imply the decoded transmissions might be heard — a trickier activity on the Raspberry Pi 5 than earlier fashions, because it’s the primary to drop the analog audio/video (AV) jack — and a USB Sort-C energy provide will get all the pieces up and operating.
The gadget boots immediately into the SDR software program, with a touchscreen as its major consumer interface. (📷: High DNG)
“We’re operating the [Raspberry] Pi in headless mode and solely launching the SDR software program, so there isn’t any different desktop stuff occurring,” High DNG notes of the the consumer expertise. “I’ve configured this factor with the LAPD [Los Angeles Police Department] channels, and I recommend doing that in your laptop and simply loading within the XML file which defines, mainly, how this complete software program operates when it comes to what you are recording.”
The total video is obtainable embedded above and on High DNG’s YouTube channel.
