I understand your confusion: Twice as long = 3 dB more loss, right?
But the loss figures for coax is given in dB per 100 feet (or meters) at a
given frequency. That is, if a particular coax has a stated loss of 4 dB per
hundred feet at 450 MHz, then if you double the length you get ANOTHER 4 dB
of loss at 450 MHz. You double the number of dB's of loss.
Hope this helps.
Gene Smar AD3F
----- Original Message -----
From: "Jim Miller KG0KP" <JimMiller@STL-OnLine.Net>
To: "TOWERTALK Reflector" <TOWERTALK@contesting.com>
Sent: Thursday, February 04, 2010 11:38 AM
Subject: [TowerTalk] Coax Loss
>I have struggled with this and have seen it both ways.
> Take an example of 100 feet of some coax at 5 db loss.
> Is the loss at 200 feet 8 db or is it 10 db ????
> And is the loss at 50 feet 2 db or 2.5 db ????
> 73, Jim
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