So after installing schottky diodes in a cobra 29 ltd chrome, I get a loud buzzing noise from receiver and the meter shows a couple S points with the nb/anl on. With nb/anl off it sounds normal. I only get the noise with the chromes. I have installed in cobra 29 ltd classic, 25 ltd classic and lx with no problems. This loud buzzing noise has occurred on three different brand new chromes. Anybody else have this issue?