[1000mp] Hi SWR on new MkV

[KB9GKC at aol.com]

In a message dated 12/13/2004 5:09:45 AM Central Standard Time,  
w9ol at billnjudy.com writes:

But an  old trick I was taught, add random lengths of coax.
Especially on 10 and  12, this 'sometimes' has an effect.


This old trick expained how I understand it.
 
The SWR reading along a coaxial line will change when tested at different  
points, but the SWR reading will never read higher then what' actually at the  
antenna.
Example:
SWR at antenna is 1:5:1
SWR reading with 90 feet of coax 1:2:1
SWR reading with 92 feet of coax  1:4:1
SWR reading with 94 feet of coax  1:5:1
 
This is where velocity factor of the feedline and cutting the coax at  
correct multiple wavelengths becomes important, it's so that you read at the SWR  
meter what' actually at the antenna.
 
Chances are that if your new MkV says it's seeing a high SWR that the SWR  is 
high.  Having a low SWR is not really that critical for efficiency  (below 
3:1 is fine) the problem arises with modern solid state equipment  that has cut 
back circuits to protect the PA.
 
Hope this helps with what we are experiencing.
73
Douglas