A server-side webapp that communicates with one or more KrakenSDRs (which can be in different geographic locations), aggregates data from them, and carries out radio direction finding on a map. Tries to be quick: It can take as little as 20 seconds to go from cold start to first bearing. Covers the whole RTL-SDR tuning range (24 MHz to 1766 MHz).
YAFB is an amateur radio fox transmitter designed for an ESP32-S2-Saola-1 and a NiceRF SA818.
Still being worked on and now works fairly well on my bench. Hasn't been tested yet in the field. As of Nov 2023 just sent in to have v4.1 of the board to be made. More updates soon.
My goal is to provide a way to make a cheap alternative fox transmitter. When done you'll be provided with all the files needed to make your own.
1W VHF or UHF transmitter (NiceRF SA818). Configure it over Bluetooth.
This is a CircuitPython port of the fox code from rot13labs.
The rot13labs 2023 Fox Hunt Badge used the SA868 modem to transmit. The model is also capable of receiving (but that capability is not used). The SA868 is a 2W UHF transceiver that operates in the 2 meter and 440 MHz bands. The code uses the low power output configuration: 45 mA and 25dBm. Communications between the Seeed ESP32C3 and the SA868 are doe via UART at 9600 baud.
Basically, you're the fox. You're the transmitter that folks are trying to DF. Make sure you have something awesome for them to find.
We offer several resources here relating to over-the-air (OTA) broadcast services (TV, FM, and others). We have a variety of online tools, downloadable content, reference information, and discussion forums to help users learn, understand, and make informed decisions about the OTA services available to them.
The Signal Analysis Tool lets you enter a location by address or by coordinate, and optionally the height of an antenna above ground. It then runs 3D propagation models for the exact location and height and generates a "radar plot" report that summarizes the signal strength and direction of all the channels in the area.
How to turn an ordinary retractable measuring tape into a directional VHF antenna (tm). Good for direction finding.