'SDR RX Front End Protector'

Most of the SDR receivers out there offer no protection from spikes , surges , or over voltage conditions that sometime are found on antenna line inputs.
My SoftRock RX Ensemble 2 is no exception.

Rather than making a mod in the RX itself I went with an outboard protector circuit.
This was vital to add as high voltage may be present when I pass TX RF through my new multi rig antenna switch box.

The circuit is pure simplicity , and I housed it in an box from and old CB low pass filter.
A spare globe fuse was taped to the inside of the lid , just in case :-)