[TowerTalk] Elevated vertical

[Al Kozakiewicz]

That's my understanding as well.

You can't ignore VSWR altogether, however.  There are a couple of considerations:

1. Many, maybe most, hams that understand changing transmission line lengths helps effect a match think that VSWR changes with length as well. Except for the added loss, it doesn't.  Also, VSWR is, by definition, the same everywhere along a lossless transmission line.  Stating that to a wide audience of hams almost always starts an argument.
2. Everyone knows (or should know) that high VSWR = higher losses in coax.  Whether those losses are material depends.
3. Most important for those that run QRO is that componments rated for 1500 watts need to be derated when the VSWR is high due to the elevated voltages.  

Al
AB2ZY

-----Original Message-----
From: towertalk-bounces at contesting.com [mailto:towertalk-bounces at contesting.com] On Behalf Of K8RI
Sent: Saturday, December 24, 2011 12:17 AM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Elevated vertical

On 12/24/2011 12:08 AM, Al Kozakiewicz wrote:

It's been my understanding that a simple wire antenna, or vertical doesn't care if it's resonant or not, nor does the antenna care if it's reactive or not.

You tune out the reactance and match the impedance to get maximum power into the antenna.  I'm neglecting phasing and directivity due to to the antenna length Vs wavelength, but even then the antenna will work just fine not being resonant.

73

Roger (K8RI)



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