[Elecraft] KX3 - Roofing filters

[Pierre]

Hello to all.

Maybe that I don't understand the real utility of the roofing filter but I observed this. Last saturday, we were on a SOTA summit using two KX3s about 40 feet appart transmitting CW at 5 W. And even with  the roofing filters on, we heard each other's sending as a diffuse noise. I know that changion RX shift to 8 disable the roofing filters, but we were not using that shift.

So, am I missing something about the use of these filters? Are they designed for operations with operators near each other like SOTA activation on a crowded summit ?

73, de VE2PID KX3 S/N 190