Have tried to manually tune the two channels which changed on the Mendip transmitter on the 11th but the Humax says no channels found and signal quality is low. My Panasonic TV which is fed from the aerial output of the Humax has retuned all channels with a 70% signal strength. Is the Humax tuner not very sensitive or is it something to do with the fact that the modulation of these two channels is 64QAM whereas the other SD channels on Mendip are 16QAM? Also a Samsung TV in the house receives all the channels after the retune so signal strength must be acceptable. I believe that if I do an automatic retune it will lose my recording schedules, am I correct?