SDRplay Community Forum

Is there a point on the RSP1A PCB that I can pick up the switched 5v that feeds the Bias-T and is there a component that I can remove to prevent the 5V being fed up the coax?

I want to experiment with using the Bias-T function to switch some outboard modules without having to tap it from the antenna connector.

I haven't looked at the schematic, but typically a voltage is added to an RF line through an RF Choke/inductor. Remove that, and tap into the non-RF side. Good luck.

IS the schematic publicly available? I've had a quick Google search but can't find anything.

Yes, there is a component you can remove - its an inductor on the pcb near the antenna plug. You remove it on your own risk. Your warranty will be void.
You can also use an external DC-block, a capacitor in series (depending on your lowest frequency 100nF-470nF, ceramic).
Imho there is no circuit drawing of RSP1A available but you can find pictures of the pcb.

Wolfgang

IQbert, I would love to reply to your PM but can't because I am not allowed to send any messages yet!

Please PM me your email address and I will send you what you need.

Thanks.