Here's another solution. Get one of kits and install it between the TX/RX relay and the front end, just as for the popular AGC circuits. The output can be clamped down with a transistor fed with control voltage from an audio module.

I used a spare module lying around, and added a diode and capacitor to rectify the output to [near] DC that varies by audio amplitude. That feeds the clamping transistor, which shunts the preamp output [which has traces for an attenuation pad already] through a 47k capacitor.? A manual control pot to feed clamping energy was added as well.

This near-short at the preamp output (isolated from the preamp by 100-ohms as R6 below, first) more than handles the preamped RF; it shuts all RF down to well below naked, factory sensitivity AND still allows the extra pickup some operators may enjoy. Not that he ubitx lacks sensitivity, but preferences vary.



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Ted
K3RTA