...and buzzing from one of the switches.
Ron,
While what you were experiencing is probably all related to the settings as discussed, the UPB switches do make a buzzing sound when transmitting. This has been discussed before (but oddly not much lately). The bottom line is if you put your ear pretty close to the switch you can hear the buzz, but at normal distances, just operating normally, 99% of the time you will not hear anything, unless maybe your house is deep cave quiet with reflective surfaces where you could hear a pin drop. (Yea, I'll never forget that experience in Mammoth Cave in KY where they went to a landing, told everyone to hold their breath for 20 seconds, turned off the lights and dropped a pin that you heard very clearly and distinctly).