What makes the difference between digital coax, analog & video

gidrah
gidrah Posts: 3,049
edited May 2003 in Basic Hookup/Wiring Questions
50 Ohms, 75 Ohms, ....etc.
What is the physical difference between these cables? Is it all just about shielding? What is this Ohm rating a measurement of? Can I swap one for the other?

P.S. I wish digital coax had the same connectors as cable coax. Then again I wish analog did too.
Make it Funky! :)
Post edited by gidrah on
· Share on FacebookShare on Twitter

Comments

  • ChrisDurano
    ChrisDurano Posts: 372
    edited May 2003
    Its the shielding and the bandwith. Digital Coaxial Cables should be 75 ohm. You can, however, find some composite video cables that are 75 ohm rated like Monster Video 2 or 3 composite cables. I'm using a Monster Video 2 composite cable for my digital coax and it works great. My volume level on my receiver is even lower than the toslink I'm using for my D.D. Satellite T.V. receiver. It also has RFI and EMI protection.
    Home Speakers polkaudio RTi70's (bi-wired), CSi30, FX3000i, PSW250

    Car speakers polkaudio EX 369, DB 650
    · Share on FacebookShare on Twitter
  • HBombToo
    HBombToo Posts: 5,256
    edited May 2003
    The impedance rating of say 75 Ohm is not an end to end measurement but rather an inner to outer sleave measurement. The impedance is typically controlled by the inner to outer diameter ratio's and the dielectric constant of the insulation between them.

    Hope this helps.

    HBomb
    ***WAREMTAE***
    · Share on FacebookShare on Twitter
  • gidrah
    gidrah Posts: 3,049
    edited May 2003
    Thanks guys.
    Make it Funky! :)
    · Share on FacebookShare on Twitter