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![]() "Bob Bob" wrote in message ... Hi Paul Just for interest what is the S/N margin with most commercial satellite systems and how "strong" is the sun relative to those levels? I would assume the margin for an end use TV viewer would be less than this? Cheers Bob VK2YQA The Carrier-to-Noise ratio for analog TV was recommended to be 8db or better for a noise-free picture (~50dB S/N after demodulation). With my 10-foot dish, the peak of a solar outage would render the picture unrecognizable as such for up to a minute. This means the sun had to be about 4 dB stronger, since I recall 4 dB C/N was no picture at all. I hope this helps. Sidelight: Analog degradation showed up as a type of video snow known as "sparklies," usually in brightly colored areas. The beginning of a solar outage would always be the appearance of sparklies. I had the analog system for almost 20 years, so I was pretty conversant with these periodic outages. Digital, I don't know. I have a small dish setup but I haven't played with it in years. Sal |
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