I have a SD633 and a couple wisycom receivers. When I use channels 1.2 or 3 there are no issues but... when I start using channels 4,5,6 I am having troubling raising the trim up high enough. When I try and turn up the trim on those channels it only goes up to 16db and does not get high enough as compared to the first 3 channels.
I am fairly new but is there a setting in my receiver that will help increase the trim ?