I only wanted two additional informations about the RSP1A who I use with pleasure for several months.
The first : it is possible to enable the bias-t in Linux with a terminal command ? (I use python scripts without graphic interface).
The second : I have bought a Nooelec LaNA who could be powered through bias tee (3.3V-5V), USB, or DC power. With the USB power I have a dc voltage (5v) on the output off the LNA and therefore possibly in opposite way on the Sdrplay antenna connector.
In that situation I would like to know (before connect) if there is a risk to damage the Sdrplay (of course the bias-T will not be enable = first question).
The Bias-T can certainly be enabled in Linux if you write an application to do it using the API. The Bias-T is only functional whilst the RSP is streaming, so the application would need to start the RSP streaming, enable the Bias-T and keep it streaming until the Bias-T was no longer required.
If the bias-T is not enabled – a DC voltage on the antenna port will not cause a problem.