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Re: Topband: Loss Question

To: topband@contesting.com
Subject: Re: Topband: Loss Question
From: Wes Stewart <wes_n7ws@triconet.org>
Date: Thu, 25 Oct 2018 10:58:07 -0700
List-post: <mailto:topband@contesting.com>
Here's a bit more from Dan, AC6LA, about this:

https://ac6la.com/swrloss.html

Wes  N7Ws

On 10/25/2018 10:49 AM, Chortek, Robert L. wrote:
Hi Mike,


That just goes so show you how little I know!  I assumed, apparently 
incorrectly, that there was some loss IN ADDITION to the transmission line loss 
(which I know how to calculate).  In other words, I thought that if my 
transmitter was connected directly to the antenna there would be some mismatch 
loss and that as soon as I added coax, then ADDITIONAL transmission line loss 
would be added and the TOTAL loss would be the sum of the two components.  I 
infer from the responses that the loss is only the transmission line loss 
(aside from whatever efficiency losses are in the system due to the type of 
loading, resistance between connections, conductor loss, ground loss, etc., 
etc.).


Thanks for your reply!


73, es DX,


Bob/AA6VB


________________________________
From: Mike Waters <mikewate@gmail.com>
Sent: Thursday, October 25, 2018 10:43 AM
To: Chortek, Robert L.
Cc: topband
Subject: Re: Topband: Loss Question

It is impossible to answer you without knowing the length and type of coax. :-)

73, Mike
www.w0btu.com<http://www.w0btu.com>
WØBTU's Radio Communication Technical Articles and File 
...<http://www.w0btu.com/>
www.w0btu.com
Amateur radio technical information by Mike Waters, W0BTU




On Thu, Oct 25, 2018, 12:24 PM Chortek, Robert L. 
<Robert.Chortek@berliner.com<mailto:Robert.Chortek@berliner.com>> wrote:
Does anyone know how much power would be lost if a resonant antenna with an 
Impedance of say, e.g.  36 Ohms is fed  with 50 Ohm coax?  Is there a good 
source where I could look up this kind of information?


Thanks!
Bob/AA6VB

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