I have just purchased the sds200 and noticed at the end of my police transmissions I get a burst of static for a few seconds and wonder if it is just because the station is just miles away, it is LTR, also when I turn on the unit squelch starts at 19 but I cannot adjust it lower until the unit warms up for about 30 minutes, has anyone had the problem of not being able to adjust squelch for 30min.