I thing we figured out the problem we were having where TTD was working on one PC but when we installed in on a new PC it was not activating on our lower tones. We were using a Relm scanner so we borrowed a Uniden handheld unit and now it appears to be working on the new PC. Can anyone recommend a good scanner that would work with TTD I was also thinking if an older Motorola radio or pager set on the frequency would work? Any suggestion would be helpful.