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In Reply to: does astrology really work? posted by petew on March 25, 2005 at 15:34:17:
We're not talking about mega-buck designer audio cables where only golden ears imagine they hear a difference.At high video and RF frequencies the quality of the cable does matter especially with long cable runs. There are specs that will give you an indication of how well the cable will perform. dB loss per 100-feet at a given frequency is just one indicator. How well the cable holds up to UV from sun light or how the jacket holds up over temperature extremes are also important for outdoor use.
Just as an example, typical cheap RG59U coax might have a signal loss of more than 3db per 100-feet at 150-MHz. What does this mean? You just lost half your signal through the cheap cable. If your antenna has a gain of 6db you just threw 3db away in cable loss. There are better cables with lower loss characteristics - like RG11U which is about 1.5db loss per 100-feet at 150-MHz.
For RF and video the quality of the coax cable matters - a lot.
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Follow Ups
- Hard facts - It's not about 'belief' - AbeCollins 00:27:07 03/27/05 (1)
- Re: Hard facts - Huh...so it's sorta like 2% Milk? - petew 10:21:45 04/02/05 (0)
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