I changed a Uniden 500 series from the regular mic and speaker to the extension speaker and my scooter's headset, using a 12v relay. now it squeals (low tone) when I release the PTT swithch. More like a clunk tone. has anyone run across this. SWR's are less than 1.5 to 1 Everything works, except that squeal is in my ear. maybe use the real speaker and not the extension? You guys know, thanks rob