[Antennas] Elementary Antenna Question

Thu Oct 1 21:18:27 EDT 2009

Randy,
If your analyzer says 50 ohms and 1 to 1 with a 50 0hm dummy load that its calibrated right. If it reads like 35 ohms for a 1 to 1 swr I bet there is a reactive component in the impedance besides the resistive.
Wonder what the reactive component is in ohms..

Loren WA7SKT

Member: ARRL and Pacific Northwest VHF Society
Member: Hearsat Satellite Monitoring Group
Location: CN86cx 

> From: wx5l at charter.net
> To: antennas at mailman.qth.net
> Date: Thu, 1 Oct 2009 19:59:26 -0500
> 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 
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