Since the change of coding for DSAT BBC Four HD it has suffered pixellation on our Panasonic Freesat TV and Blueray/HDD recorder. Digging around the 'net indicates this is some weird hardware problem for certain Panasonic Freesat kit, that we have...
I've checked the alignment of the dish and have full strength and high quality signals preety much across all Freesat channels. Recently SWMBO'd complained about pixellation on BBC Four *SD*. So checked around the three receivers. Only BBC Four HD on the telly showed pixellation, so not convinced the report was correct but I'm not going to go there.
Anyway half unplugged the cable from the LNB on the telly, signal strength drops one unit, bit error rate drops to zero and pixellation disappears. Properly connect the LNB and the bit error rate increases and pixelation returns. To me this indicates that the signal is "too good" and is overloading something in the telly - the obvious solution is an inline attenuator.
An attenuator would need DC pass through and something above 2100 MHz but what value of attenuation? I have no reference for how much reduction in signal you get from a partial unplugging, or the range that the builtin signal meters operate over. I'm caught between thinking 3dB not being enough and 6dB being too much and messing up the other channels (which are all OK in the partial unplugged condition). erring to 6db?
Actual devices I'm looking at Vision V60-103 or V60-106. At some point there maybe a multiswitch installed, so they'll fit onto the board that'll be mounted on quite nicely.