My HAL RTTY-1 RTTY TUNE indicator seems to have an intermittent problem, and I wonder if others have seen it. Either on background noise or a signal, both the mark and space LEDs go from, say, half-scale or even full scale, to just a couple of LED segments. The signal or noise is changing, and I don't see it on my other tuning indicators (scope or software). Is it ill? Jim N7US