Towertalk
[Top] [All Lists]

[TowerTalk] Gain vs. VSWR vs. Feedline Loss

To: <towertalk@contesting.com>
Subject: [TowerTalk] Gain vs. VSWR vs. Feedline Loss
From: davidc@bit-net.com (DavidC)
Date: Tue, 21 Jul 1998 15:37:03 -0400
> Gain is not VSWR is not Feedline Loss.  They are three completely
separate
> issues.  73, Ward N0AX

I'd like to try to simplify this for a non-engineer type such as I.

1.  If there is feedline loss then less signal gets from the TX output to
the antenna (and thus 
     to the listener -- you).
2.  If there is feedline loss then less signal gets from the antenna to the
RX input (and thus 
     to the listener -- me).
3.  If there is high VSWR then less signal gets to the antenna because the
TX (if solid state 
     and circuit-protected) automatically lowers the power output.
4.  If there is high VSWR then feedline loss may increase due to heating
and radiation and 
     thus less signal gets to the antenna and directed towards the intended
receiver.
5.  The more gain the antenna has the more the TX signal is magnified
(after adjustments 
      measured in 1, 2, 3 & 4 above).
6.  The more gain the antenna has the more the RX signal is magnified
(after adjustments 
      measured in 1 & 2 above).

Do I finally have this clear?  :-)

Thanks & 73, DavidC  AA1FA

--
FAQ on WWW:               http://www.contesting.com/towertalkfaq.html
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm


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