[TowerTalk] RG11 Cable

[DF3KV]

But only if the line length is a quarter wave electrically or an odd
multiple

73
Peter


-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Dan Zimmerman N3OX
Sent: Dienstag, 25. August 2009 22:50
To: towertalk at contesting.com
Subject: Re: [TowerTalk] RG11 Cable

>
> By what math?  A 50 ohm (purely resistive) antenna is a 1.5:1 mismatch to
> 75 ohm coax (and an antenna that is 50 ohms but not resistive would be a
> mismatch to 50 ohm line). The SWR falls along the length of any real
> transmission line due to line loss,


The 1.5:1 SWR circle for lossless 75 ohm line intersects the real axis at 50
ohms and  112.5 ohms resistive.


112.5 ohms resistive is 2.25:1 50 ohm SWR when you transition back to a 50
ohm system
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