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Re: [Amps] Does coax loss depend on SWR?

To: "'AMPS'" <>
Subject: Re: [Amps] Does coax loss depend on SWR?
From: "Randy" <>
Date: Sat, 1 Mar 2008 18:25:20 -0800
List-post: <">>
Thanks Steve and John for the info and explanation...

de Randy, W7HR
Port Orchard, WA


-----Original Message-----
From: [] On
Behalf Of
Sent: Friday, February 29, 2008 11:41 AM
Subject: Re: [Amps] Does coax loss depend on SWR?

All along the coax (with  SWR > 1:1) the forward and reflected voltage and 
current components add  vectorially. The vector sum of each component
and current) is that of  the forward and reflected components and the phase 
difference between them. The  resultant voltage or current is always higher
the incident wave component  value.
As the coax has both conductor  (I squared R) and dielectric (E squared / R)

losses, the increase in  voltage and current in the coax relate to increased

loss within the coax. And,  as all the reflected power is not absorbed by
load on its return trip and  re-reflected, even more power is still lost
each  trip.
-John,  N9RF

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