grahamlthompson - 5 hours ago »
the signal strength will vary with Mux and also some use reduced power. No aerial has a completely flat gain curve with frequency. To test the second tuner on the same MUX you will need firstly to set two recordings on the same mux to fully utilise tuner 1 and then view a 3rd channel on the same mux.
Try recording BBC 1 - HD 101, BBC - 2 HD and then tune to one of the remaining PSB 3 channels 103, 104 or 105,
What signal strength is now shown ? incidentally if a steady 100% quality is shown the signal strength is irrelevant.
When recording various channels and watching another, the signal strength on each tuner is 87%, 73% and 43% respectively, quality on each is 100%, so from what you've said all is fine