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Message: <blockquote data-quote="dogsknob" data-source="post: 26746" data-attributes="member: 176218">Further to the above, I had a good one today. It was a Panasonic 31 with no low band signals. Turned out to be the 13/18v switched regulator on the PSU board. When I scoped the LNB supply it had an almost perfect 190 Hz sawtooth of about .8v p-p sat on top of the DC. Looks like this had confused the LNB into thinking that there was always a 22khz signal, hence no low band.I wonder if this is similar to the "spurious 22khz" that the filter is meant to cure.Any comments ?</blockquote>