A few of the problems mentioned here might be due to "sun-out". It
started around the first of March, and is getting near the end. This
happens twice a year, and goes on for a few days.
What happens is from the receive dish's perspective, the Sun is right
behind the satellite it's trying to receive. The electrical noise from
the Sun is stronger than the signal from the satellite and blocks the
signal. This only lasts a few minutes each day, during the week or so
that everything is aligned just right (or just wrong). The exact time
it happens depends on the position of the receive dish on the Earth's
surface, and the satellite's orbital position. For analog receivers,
the picture gets progressively noisy, goes completely to noise, and then
slowly clears. For a digital receiver, it may "pixelate" for a short
while, then blank out when the error rate goes higher than the decoder
can handle.
Of course this doesn't explain any long term quality problems. Those
sound like the allowed bit rate for a channel is set a little too low.
--
Tony
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