Oh please, please do explain how an additional PL input (input 156.7 always available and output always 156.7) defeats anything. It’s invisible. It takes away nothing and interferes with nothing…and I mean nothing. It will not completely fix the problem but rather could mitigate it, and maybe not enough to be worth the effort. At present many of us in overlap shield our antennas towards distant repeater when we can. God forbid anyone tries to improve what they have or even inquire about it (not engender waste). I’m trying to fix a loose horseshoe and being told I should get a new horse, or three.Your not understanding the point.
As for adding another PL that defeats the entire effort of the NIFOG and Interop requirements. As said this is a people problem and easily fixed if its indeed a true issue.
My original question was how hard/expensive to run dual tone.
mmckenna answered that question early on. Speedways link to “Proper Use” was also constructive. Quite by accident (not my field at all) I ended up in a early on planning meeting about hardening cockpits. I asked what if the bad guy is on wrong side of the door? FAA rep answer: “That won’t happen”.