Regarding Turksat, I ve also tried a lot, but failed. U cant get this sat on small dishes.
120 cm dish would def. fetch the signals, but I think, a 100 or may be a 90 cm cud also do the trick.
Yes shawl is right and I already told you that you need minimum 120CM for good reception in your area the all these satellite you will get easily. If don't want 120CM then 100CM should be must ok.