Powering small LoRa devices
My latest reorganisation is to set up a Raspberry Pi to connect various LoRa devices providing power and a console to each. I have four such devices, three of which were powered from a 12V PSU with a USB adapter plugged into the 'cigar lighter' socket, adn one was powered from the ADS-B feed in the loft which in turn is powered by the Pi that does the ADS-B feed. That powers the rtl-sdr dongle plus an LNA, both colocated with the collinear in the loft.
The new setup consists of a 7-way USB hub with switchable power to each USB connector. This hub is connected to the USB 3 port on a Pi 4B. Five ports are in use, one for the radiosonde receiver, one for the TinyGS receiver, one for the 868MHz Meshtastic node in the loft, and one for the 70cm Meshcom node also in the loft. The latter two are fed via 15m USB leads. The fifth connection is not an active device - it is my illuminated shack sign!
This gives several advantages. First, each device can be power cycled without needing to fiddle with the USB connectors. Second, each can have a console on the Pi. Finally, it makes it a lot easier to upgrade software - except for one LoRa device that has to be booted while holding a switch down before it can be upgraded.
The Pi itself is PoE powered so there are no wall-warts involved. The PoE switch itself, by Netgear seems to be RF quiet.
All I now need to do is sort out the USB leads and position the two LoRa devices in the shack better as they currently dangle from their leads!