I Have recently installed my own sky + System, Used Existing cable from old sky +. Some channels are stuttering but not all ( SKY 2, UK GOLD, MTV CHANNELS and a few more), Measured both dish input signals with rover sattelite meter and reading 80+DB the highest i have seen. Any ideas why these channels are jumping. Could it be the signals are to high and may need an attenuator any one have any ideas, Thanks