[Antennas] Elementary Antenna Question

[Bill Aycock]

 Randy--
You mentioned efficiency but did not tell us how you measured or calculated 
it, or what the value was. You mentioned antenna resistance, when I think 
you mean impedance, but did not say how you had the MFJ-259 connected to the 
antenna. What was the length of the RG-11 and where was it connected?
When these things are clarified, I'm sure some answers and advice will be 
forthcoming.
Bill--W4BSG

----- Original Message ----- 
From: "WX5L" <wx5l at charter.net>
To: <antennas at mailman.qth.net>
Sent: Thursday, October 01, 2009 7:59 PM
Subject: [Antennas] Elementary Antenna Question


> Hello
>
> I was thinking about antenna efficiency and was sweeping my quad with my
> MFJ-259 and was curious with the findings.
>
> Basically why does the antenna resistance(50 ohms) does not correspond 
> with
> the SWR dip?
>
> For example in my case........I have a 50 ohm reading with the MFJ at 
> 14.025
> with a SWR of 1.5 to 1 but the SWR dips to 1.2 to 1 at 38 ohms and at
> 14.325.
>
> I would think the antenna would be most efficient at a 50 ohms reading
> rather than 38 ohms even with a lower swr.
>
> I am not using any baluns but do use 1/4 wave matching transformers of
> RG-11.
>
> Seems picky I know but if someone has an answer I'd like to know.
>
> Thanks,
> Randy
> WX5L
>
>
> ______________________________________________________________
> Antennas mailing list
> Home: http://mailman.qth.net/mailman/listinfo/antennas
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Antennas at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>