freesat reception quality

[pistonbroke]

Hi can anybody help.... i have a freesat box, and a previously installed sky mini dish. when i install box i get nearly 100% signal but when i try the chanels some are strong signals but a lot are low to medium, i cannot view any under 90% signal.i have reset azimuth,scew, and angle, i have set to the strongest reception. Here is an example=
chanel 4 maybe 40%, yet chanel 4+1 is about 95%
bbc midlands 75% bbc london 98%
sorry there's a lot of figures. does this sound like the LNB failing thanks in advance.

[romko]

check the condition of the cable you are using as a downlead. shoudl be good quality with aluminum shielding.