[Top] [All Lists]

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

To: Amps group <>, Bill Turner <>
Subject: Re: [Amps] Ten-Tec Titan 10 Meter Input SWR
From: Catherine James <>
Reply-to: Catherine James <>
Date: Sun, 11 Jun 2017 14:27:00 +0000 (UTC)
List-post: <>

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 
 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
Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>