Off Grid Pete
@OGridPete • 2,960 subscribers
Human, free speech & 2A advocate. Science/technology geek, Tesla & SpaceX fan. Off-grid communications & radio enthusiasts.
Videos
Fieldwatch 1.1.14 Update Fieldwatch listens for nearby Wi-Fi and Bluetooth signals and identifies the devices sending them, such as tracker tags, body cameras, drones and in-car Wi-Fi. It does this using a list of device signatures you can edit in the app. You can get an alert when a specific device type or address shows up, and you can record a session in one place or along a drive, then compare it with later visits. Fieldwatch can also spot devices that seem to be moving with you and build reports from everything it picked up. What’s new: See where you’ve been. The Reports screen now draws your route as you drive, the last 15 minutes or a full session. Stops show as green, flagged devices as red, and bookmarks as blue. Each device gets one numbered marker at its strongest signal. With online maps on and Privacy mode off, the route sits on a street map. Otherwise it’s a plain line. Video (sped up) shows a path that updates every few seconds as you drive. It’s on the Reports tab. Better PDF reports. Debrief and Compare PDFs now include that same map. Sessions, explained. A session (a "sit" in the app) is a named stretch of time and the devices heard during it. Session export lists each device once. Log export is the full running record. Drone detection. Fieldwatch now reads Remote ID, the digital license plate most drones broadcast, over Bluetooth and Wi-Fi (Android 11+ for Wi-Fi). In TAK mapping apps, each drone shows as one moving marker, with a second marker for the pilot. It works best when a drone hovers nearby. More accurate identification. Google Find Hub trackers, readable tire pressure sensors (including Teslas while awake), Flock's battery pack and gunshot microphone, and Axon body cameras are all identified more reliably. Smart glasses from Meta, Snap and Vuzix are still flagged. You can update the device signature catelog from GitHub when you're online. Signature catalog 81 can now identify up to 242 types of devices. Bug Fixed: A signal strength of 127 means Bluetooth couldn't measure it, not that the device is close, so hunting mode and shared reports now ignore it.
Off Grid Pete22,637 views • 2 days ago
Just tracked a randomly selected transmitter using the Kraken SDR, and it only took about 10 minutes of driving. This is classic “fox hunting” in the amateur radio community: a longstanding direction-finding sport that pits operators against each other in locating hidden signals. Yet beyond the fun, it delivers a sobering real-world demonstration of how rapidly any transmitting station can be located the moment it keys up. The Kraken SDR achieves this with a compact circular array of five evenly spaced dipole antennas connected to fully phase-coherent receivers. All five channels share a common high-precision clock source and run continuous calibration to maintain synchronization. As the incoming RF wavefront reaches each antenna at microscopically different instants, the system measures the resulting time-of-arrival differences (equivalent to phase shifts across the array). Using advanced correlative interferometry and the known physical geometry of the antenna placement, it computes the precise direction of arrival (bearing) in real time and overlays it directly on an interactive map. Mitigation techniques are essential if you wish to minimize your detectable footprint: transmit at the absolute lowest effective power required, limit yourself to extremely short bursts, employ directional antennas carefully oriented away from potential listeners, implement frequency agility or hopping patterns where feasible, and, when operational security demands it, maintain complete radio silence. In today’s environment, understanding and managing your RF signature is no longer optional.
Off Grid Pete56,463 views • 7 months ago
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