Hello all; My Mark V IPO is acting strangely. If it is ON or OFF dictates if any signal at all is audible. Here is the breakdown; this setting is needed to hear anything, otherwise dead silence: 28 OFF 21 ON 14 ON 7 OFF 3.8 OFF There is no pattern or logic as far as I can find. Anyone have any idea why this is happening? 73 de Steve aa7v