I have a Kenwood SM-220 monitor scope where I have to have the RF attenuation all the way to minimum to see much of a signal. Anything less than that and it is not much more than a horizontal line. This is with 100 watts. When I run 500 watts through it, I get a much better display with the attenuation set to minimum. Is this normal or is there something wrong in the RF attenuation chain. Thanks and 73.