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65.12.39.5
In Reply to: Using fiber optical technology in wrong application. posted by Tony Montana on March 9, 2005 at 15:10:39:
.. until you read the info or look up the facts.First, the graph published at the individuals web site was not for an HT product, but for one he "thought" was the same as the HT product.
Second, they are not using digital modulation or encoding techniques, but rather, analog light transmision via photoreceptors. As a simple example, varying the light level from an LED in response to the analog signal strength, and feeding that into a photcell with a DC bias across it, is a similar kind of technique.
As for the roller coaster frequency response, I don't suppose you noticed that it was on a scale of tenth's of a dB for the major divisions, and the total deviation from approx. 40-50 Hz on up to around 100 kHz was about +/- 0.1 dB. Not exactly what most folks would call a roller coaster FR, in fact, many CD players and electronics like preamps and power amps have comparable frequency response deviations, or even greater. Most modern HT receivers vary this much OR MORE.
So don't let your ignorance and bias affect your evaluation of such a technology, and please find out the true facts before posting your misunderstandings as fact.
What ever happened to the pursuit of "Science" ? This kind of post sure isn't it.
Jon Risch
Follow Ups:
Wow jon...you must really hate Tony...why else would you call him ignorant and biased??..JR: ""Please refrain from comments..... until you read the info or look up the facts.....So don't let your ignorance and bias affect your evaluation of such a technology, and please find out the true facts before posting your misunderstandings as fact.""
Hmmm...lets see...Jon L said this:
Found the following measurements of Harmonic Tech Cyberlight on the web. I still can't believe my eyes about the frequency response graph :(""
To which, Tony said this:
Fiber optics technology is purely digital (light on/off). But apparently Harmonic Tech Cyberlight is trying to use it in analog application by varying the intensity of light (They have laser tx/rx modules inside the terminations that convert electrical signals to a continuously-variable intensity laser beam). Thus the distortion, and "Roller Coasters" like frequency response :)""
And then, you say this:
First, the graph published at the individuals web site was not for an HT product, but for one he "thought" was the same as the HT product.
Ok, that is a good clarification....Then you said this:
Second, they are not using digital modulation or encoding techniques, but rather, analog light transmision via photoreceptors. As a simple example, varying the light level from an LED in response to the analog signal strength, and feeding that into a photcell with a DC bias across it, is a similar kind of technique.
Which, of course, is exactly what Tony said here....
""trying to use it in analog application by varying the intensity of light ""JR: ""What ever happened to the pursuit of "Science" ? This kind of post sure isn't it.""
Whatever happened to impartial and unbiased moderation, and civil discourse?? It would appear that "Tony bashing" is your idea of civility?Please leave your agenda elsewhere, Jon..there is no need to bash others. Simply correcting their errors would be just fine..
Cheers, John
I have told Jon in the past that if he takes a usual detour off the subject, his post will be ignored....no response.Thanks John :)
Knowing what you are talking about helps a lot, and posting ignorance and heresay, instead of looking it up or reading about the subject, always helps too.When you post these ignorant and uninformed posts, posting as if you were the one on the right track, and everyone else is off in left field, it helps no one, including you.
However, it may confuse a newbie or neophyte, hence the need to either setr the reocrd straight, or delete the posts. I have been choosing not to delete, leaving your uninformed reply up for posterity.
Jon Risch
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