Hi Guys,
Panic over. - This is incredible. - I worked up the courage to remove and dismantle my LNB. Inside I found a number of flower petals compressed into a ball and pushed against some fine needle points attached to the inside of the casing. I carefully removed the petals and found one needle to be bent whilst another had been broken. Presumably this was a nest of some sort constructed by insects, although no insects were present. I discussed what I had found with a satellite engineer who came to have a look. He confirmed that my channels had been lost because the LNB needle points had been broken off. - He actually found the broken point among the flower petals. - Anyway, a new LNB was fitted and 5 minutes later normal service was resumed.
John
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