pk : > >> > 5. frequencies of the channels are different am : > >> Very true, each channel occupies 6 Mhz bandwidth with the center frequencies ranging from 50 Mhz to 864 Mhz.
pk : > > there .. so its not 4.5 or 5 Mbps .. but 6Mbps .. we do know that the 'hertz' in the MegaHertz means cycles .. and i guess we also know that with the enormous progress in h/w .. each cycle CAN be made to carry more than a single bit .. by cutting up the + and - parts of the cycle into yet further segments (prior half of + part of the cycle to represent a bit and the latter half of a + part of the cycle to represent yet another bit) am : > True, you just conveyed the idea of modulation in oversimplified terms. Congrats, we are coming in sync. Engineers will however hate this oversimplification of their thoughtful and well researched work of ages :) Hope engineers, and the would be engineers do not get offended. Professors and teachers would love this discussion for sure. am : > >> Local cable tv provider can certify this for you. pk : > > oops .. these guys don't know how things work .. ketan may .. he is helping on cable operator to give broadband (read shared rj45 wan) from beck bagan to golf green as of now .. but even ketan can't authoritatively tell .. for authoritative measurements, our list's geniuses are capable .. so is tapan sengupta who joined us at the last meeting .. he even has the h/w and s/w to do such measurments .. and he did talk to me about signal types/levels yesterday too .. we are trying to put in a wi-fi wan .. hot spots .. in udita .. with bsnl's broadband connection being used by nodes to access internet (legal issues ARE involved) .. at the ilug-cal's recent meeting location : UDITA am : > Local cable wallahs even those who hang the cables know a lot about poor and good signal and the bends and joints etc. (in rustic terms) affecting the RF path. They will basically explain the behaviour of RF as observed by them. Of course, if we ask them about modulation schemes and encoding they may refuse to talk to us in future. RJ45 WAN is very popular in congested cities in a country like India (I have seen large networks in Mumbai about 3 years back), where one can tap small amounts of electricity along the way using the inexpensive POE (Power over Ethernet) jacks. Basically using the spare pairs in the CAT-5 cable to feed power. > Hope in the next meeting both Tapan and Ketan can share more time and information with us. -- To unsubscribe, send mail to [EMAIL PROTECTED] with the body "unsubscribe ilug-cal" and an empty subject line. FAQ: http://www.ilug-cal.org/node.php?id=3
