In fact an absolutely digital signal may not even be possible. Even in fiber optic cables, if you had a machine capable of analyzing the signal, you would find that the light does not appear 'instantly', but rather starts at a lower level than the final '1' signal. Of course, if you go low enough, maybe the light either exists or it does not exist (a true digital signal). The question is whether you could create a receiver sensitive enough to detect a single photon at any distance. How could you create a single photon in a controlled manner so it could carry information? Even light is a 'wave' which is analog by definition. Those pictures you see in the books with the square shapes on the 'wave' probably are an artist's depiction, not a picture of the actual wave. But I could be wrong as I have not actually seen a single photon - or maybe I have?
----- Original Message ----- From: "Jim Felton" <[EMAIL PROTECTED]> To: "'ProFox Email List'" <[email protected]> Sent: Thursday, October 30, 2008 6:01 PM Subject: RE: [NF] No digital TV signal? Mike just so you know, the digital signal your talking about isn't really digital. It is actually an 8VSB analog signal with digital data encoded in 8 subcarriers that have to synchronize as a single block to be received as data. You are right that there is On/Off relationship in the encoding of the data stream (Spec. 292) that is feed into the transmitter, but that is more or less the end of the digital part until it is received and decoder by your receiver/TV at which time it become digital again to be processed by decompression algorithm in the receiver and then guess what it goes back to analog if you have a TV with a picture tube. Good luck with the class. Jim -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Thursday, October 30, 2008 12:09 AM To: [email protected] Subject: Re: [NF] No digital TV signal? Analog signals that come in weak will be seen as fussy, or not at all. Digital signals that come in weak will be able to be readjusted to look 100 percent perfect when initially sent out because of how digital signals are broadcasted / made. I am studying it in networking 101 right now. With digital, the signal is either on (1) or off (0)n therefore when the signal is recieved, if there is any signal measuring above (zero) then it is viewed as a on (1). If you want me to get into the science behind the digital signals, let me know and i will go more in depth. Mike Wohlrab Sent from my Verizon Wireless BlackBerry -----Original Message----- From: "Charles Hart Enzer, M.D., FAACAP" <[EMAIL PROTECTED]> Date: Wed, 29 Oct 2008 23:33:26 To: <[EMAIL PROTECTED]> Subject: Re: [NF] No digital TV signal? You don't need a digital antenna. The website below answered all of my questions; especially, since my signals come from three different compass points. To get all of the compass points without having to turn the indoor antenna, I got a GE Amplified Quantum Antenna #24775. From Froogle: http://www.google.com/products?q=Quantum+Antenna+%2324775&btnG=Search+Produc ts&scoring=p It has three panels so I was able to capture signals from three compass points up to 26 miles from me. My suggestion: try your current antenna first. Analog drops dead at midnight on February 17, 2009. All full-power television stations in the United States will stop broadcasting in analog and switch to 100% digital broadcasting. At 10:42 PM 10/29/2008, you wrote: >Check out this website: >http://www.antennaweb.org > >Enter your address (you don't need to enter your name) and it will tell >you where the closest broadcasting stations are. > >I helped my neighbor hook up a large antenna inside his attic (HOA won't >let us put one on our roof) and we did some tests. We then hooked up a >signal booster very close to the antenna (within 5') and re-tested. The >improvement was remarkable. These boosters need some power, but he had >an outlet in his attic that also ran his furnace. > >The booster would not work as well if placed closer to his "digital to >analog converter" box. Having the booster closer to the antenna is key. > >HTH, >-Kevin >CULLY Technologies, LLC > > >Pete Theisen wrote: > > Hi Everybody! > > > > I popped 10 bucks and the government coupon for a digital TV converter. > > I hooked it all up and there is no signal. Of course, there was no > > analog reception to speak of. > > > > Aren't all the TV stations broadcasting digital by now? > > > [excessive quoting removed by server] _______________________________________________ Post Messages to: [email protected] Subscription Maintenance: http://leafe.com/mailman/listinfo/profox OT-free version of this list: http://leafe.com/mailman/listinfo/profoxtech Searchable Archive: http://leafe.com/archives/search/profox This message: http://leafe.com/archives/byMID/profox/[EMAIL PROTECTED] ** All postings, unless explicitly stated otherwise, are the opinions of the author, and do not constitute legal or medical advice. This statement is added to the messages for those lawyers who are too stupid to see the obvious.
