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Re: RG 6 Signal Loss.

The higher the frequency, the higher the loss.  Get one of the chart cards the others have recommended and make sure to read the conditions those limits are under.  As an example, most charts are based on "lab facts" such as it being 70-degrees and the cable is exactly 100-feet.  Expect higher loss if your ambient air temp is greater than 70-degrees.

Most likely your in a system that is 5Mhz to 1000Mhz (1Ghz).

In general, I usually kept just some general outlines of loss in my head:


RG-6:  Ch2(55.25Mhz) 1.5db loss in 100-feet.
          Ch70(499.25Mhz) 4.0db loss in 100-feet.
          Ch104(675.0Mhz) 6.0db loss in 100-feet.
          Ch134(855.0Mhz) 10.0db loss in 100-feet.

Again ...those are not exact to the chart, but for field installs, it's a good starting point on estimating your signal loss to help determine if you're going to use RG-6 or RG-11 for your drop from tap to D-Mark.  The math is simpler by using the numbers above should you need to double the distance ....or half the distance.

I get the feeling what your after is some over-view numbers as you are getting your home-run and drop distances, then checking the signal at the tap to see what the best size cable to use for your drop.

Also .... RG-6 is fine up to 150-feet.  The signal you gain by using RG-11 shorter than 150-feet is negliable.  Best to save the -11 for those runs from 150-feet to 300-feet.  Over 300-feet and most MSOs want to look at plant extention.

Good luck with it.
This is CABL.com posting #285963. Tiny Link: cabl.co/mbmyt
Posted in reply to: Re: RG 6 Signal Loss. by turabahamut
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