RG numbers with coax

Discussion in 'Archived Threads 2001-2004' started by DarrellC, Mar 15, 2003.

  1. DarrellC

    DarrellC Stunt Coordinator

    Jan 25, 2003
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    What are they and what do they mean? What RG# are all of the top cables?
  2. Chu Gai

    Chu Gai Lead Actor

    Jun 29, 2001
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    Read about it on Beldens's web site.
    What does RG mean?
    What is an RG "type" cable?
    You'd have to contact, or try and discern from published specifications. For a short run, it really makes no difference if you were to use a thinner center conductor like RG58 as opposed to RG6. The former's easier to work with and lighter, all else being equal. If a 75 ohm cable's your thing, there's lots of ways to to make it.
  3. Bob McElfresh

    Bob McElfresh Producer

    May 22, 1999
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    A little more info:

    When cable TV started, thousands of miles of RG59 were strung from house-to-house. As sat dishes, cable modems, etc (higher frequency signals) came out, RG6 coax became the standard. It has less loss over 100 feet and the shielding works better at the microwave frequencies for DSS. The price between the two is essentially nil.

    For Video cables, RG59 is still used, but many/most cables are now using RG6. My guess is that the switch is for economic reasons rather than any performance issues along a 6-12 ft length.

    Ex: The Acoustic Research Pro series of cables was using RG59, but this has recently been replaced with RG6 and called "Pro2".

    Not all RG6 coax are the same: Think of "RG6" as being a rough indicator of size. The actual performance of two different RG6 coax cables can be different.

    The key is to know what frequency signals you want to send down a coax, then look at the manufacturer specifications.

    Example: Component video tops out at 4 Mhz, Progressive video at 13, and 1080 HD video at 35 Mhz

    A common criteria is to take a X2 or X4 factor of your highest frequency, then find a coax that can send this signal down 100 feet with a less that 3 db loss. (Most of the cable manufactureres publish these "Attenuation Tables" - "Attenuation" is a fancy word for "Loss").

    Does this help?

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