RF Toolbox build — internal RTC, GPS, SDR and LoRa on a uHub
mwaldron's CM4 build: better Wi-Fi antenna, an I²C RTC on the expansion-port pads, GPS and an RTL-SDR on a modified uHub, LoRa and CC1101 in progress.
What it takes
- Disassembly
- Soldering
- Purchase required
Difficulty 3 of 3 — advanced.
Details
The RTC is soldered to the expansion connector's I²C pads and powered from one 18650 (microamp draw). One of the uHub's external ports was reassigned to an internal GPS module; the RTL-SDR hangs off the hub's internal header; the LoRa board uses what appears to be SPI from the hub's edge header. Written up as a show-and-tell with photos, so it is a reference for what fits rather than a kit.
Links
Open at Forum threadRelated mods
The all-in-one expansion card: RTL-SDR, SX1262 LoRa, GNSS, RTC and a USB hub with internal USB-C; the adapter board adds USB 3.0 and Gigabit Ethernet.
The 2024 original: an RTL-SDR (R820T2), USB hub and real-time clock on one expansion card — the board that started the AIO line.
An open expansion card with a LoRa radio (RFM98-class module) and a GNSS receiver, designed for Meshtastic-style use.
philosiraptor's board gives a RAK Wireless WisBlock LoRa module an internal USB connection so Meshtastic runs inside the console.
Koha's internal Meshtastic radio in SX1262 (850–930 MHz) or SX1268 (410–493 MHz) versions, with 30 or 33 dBm high-power options.
A DigiRig 1.9 clone on an expansion card: audio interface with PTT and a UART, both on 2.5 mm jacks, plus an RTC — for portable digital modes.