To: CommSatMan who wrote (4802 ) 5/20/1999 11:26:00 PM From: Maurice Winn Read Replies (2) | Respond to of 29987
*Voice delay and wonky satellites* CommSatMan, I don't believe you hate to disagree with me. Okay, ICO won't be 400ms delay, or even 300ms. But it's slower than Globalstar by a good chunk. Let's say 100ms for voice coding, 10ms to send some photons via fibre from London to Auckland [that seems a bit quick, but never mind], 225ms to a GEO and back. That means those cute little GEO handsets will give people a total latency, delay or whatever you call it of 335ms. That isn't enough to make a cup of tea, but it is enough to bug any normal human. Even clicking around on The Web it would be annoying to wait a third of a second per click. People do a LOT of clicks in a year. Talking is even worse. They will happily pay an extra 10c a minute in conversation to avoid the delay and that is how much Globalstar can do minutes for in Constellation2. For ICO, 100ms for coding, 100ms for the round trip [a 25,000km one when the satellite is not straight overhead but is halfway to the horizon], 10ms for terrestrial = 210ms total. That is still at an annoying level. For Globalstar, 90ms coding [CDMA by Q! is better than those other ones - yes, I'm making that up, but with their MSM3100 I bet it is pretty quick], 15ms round trip [4,000 km when satellites are near the horizon], 10ms terrestrial = 115ms. Wow!!! Like lightning. No delay to notice. So, I think we agree on round trip times, though like you, I hate to agree. On the second topic, I had the impression that the last launch wasn't totally according to Hoyle. One of the satellites might have gone a bit wrong as a result of dispensing and ended up pointing at the sun instead of the earth. Soldering and wiring is apparently quite an art on these things and if you get the wiring back to front, you could get the orientation wrong. Maybe they are trying to save fuel while they sort it out. Though Bernie said all satellites were properly acquired and are functioning fine. The Chinese found out about soldering. Imagine if Loral figured out wiring diagrams too and told them to get the polarity right. Then if the Chinese got more recent maps than the CIA, there could be irreparable harm done to the American Embassy in Taiwan. When does the USA announce how many hundred million $$ compensation they'll be paying China for destroying the embassy and murdering Chinese nationals? What's an ephemeris? If they had to do a somewhat uncontrolled dispensing from a malfunctioning Ikar unit, would that result in a wonky ephemeris? Say they had to do an 'ejection seat' type escape like in a crashing fighter plane. That could make things go wrong. Agreed now? Maurice