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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky
"F" Plugs (Very sad question....)
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<blockquote data-quote="Channel Hopper" data-source="post: 36061" data-attributes="member: 175144"><p>I am sure theres a formula somewhere for working out the distances of inner to outer dielectric to determing the best impedence of a cable, but I dont have it here</p><p></p><p>50 Ohms is used whenever there is a need for high power to be passed through a cable (its lower impedance means delivery is better) and is characteristically used on systems that require a ground plane.</p><p></p><p>75 Ohms is used on predominantly receive only system (either on a dish/LNB, or in the standard TV system where there is a dipole aerial at one end). Its usually far cheaper per length, has cheaper conductors, and is usually more tolerant when a mismatch of equipment is connected at either end.</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 36061, member: 175144"] I am sure theres a formula somewhere for working out the distances of inner to outer dielectric to determing the best impedence of a cable, but I dont have it here 50 Ohms is used whenever there is a need for high power to be passed through a cable (its lower impedance means delivery is better) and is characteristically used on systems that require a ground plane. 75 Ohms is used on predominantly receive only system (either on a dish/LNB, or in the standard TV system where there is a dipole aerial at one end). Its usually far cheaper per length, has cheaper conductors, and is usually more tolerant when a mismatch of equipment is connected at either end. [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky
"F" Plugs (Very sad question....)
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