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Re: [Amps] Ten-Tec Titan 10 Meter Input SWR

Subject: Re: [Amps] Ten-Tec Titan 10 Meter Input SWR
From: Larry Benko <>
Date: Sun, 11 Jun 2017 10:57:45 -0600
List-post: <>

I have an entire YouTube channel with over 30 videos to date showing how the free program SimSmith can calculate these types of problems very easily. The graphical output of SimSmith makes understanding a huge number of amateur radio and RF topics much easier.

or go to YouTube and search for my call sign.

To answer your question 25+j0, 100+j0, 40+j30, 40-j30 all are exactly 2:1 SWRs.

Larry, W0QE

On 6/11/2017 8:27 AM, Catherine James wrote:

I'm puzzled at the idea that changing "the impedance the transceiver sees" 
wouldn't affect SWR. Isn't SWR the ratio between the impedance seen at the measurement 
point vs. the desired impedance at that point? I must not be understanding your comment.

Anyway, you can certainly change impedance by changing the length of coax, 
provided that the coax used does not have the same impedance as the impedance 
at the termination point.  So if you have a 50 ohm load fed with 50 ohm coax, 
it does not matter how long the coax may be, but if you use 75 ohm coax for 
part of the feedline, the impedance seen at the transmitter will vary with the 
length of the 75 ohm section.

The matching section does not have to be a quarter wavelength long.

On Sat, 6/10/17, Bill Turner <> wrote:

   >Tried different lengths of coax between the amp and the radio and still no 
REPLY: The length of coax does not affect SWR unless it is extremely long,
  where line loss comes into play. Even then, the effect is to reduce
  SWR, not increase it.
It does affect the impedance the transceiver "sees", but not SWR. 73, Bill W6WRT
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