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 High SWR issues

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talky12
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Join date : 2021-02-05
QTH or Location : Cumbria
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High SWR issues Empty
PostSubject: High SWR issues   High SWR issues Icon_minitimeTue Apr 23, 2024 6:45 pm

Hi everyone I’ve got a 102” ss whip on a mast bolted to the side of my house and my swr across 40 channels (cept) is sat at 3.5 if I take the mast down and lay it on the ground the swr is 1.2 how can this be? I’ve checked everywhere I can with a dummy load and my swr is absolutely spot on at 1:1
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FreqFreak
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PostSubject: Re: High SWR issues   High SWR issues Icon_minitimeWed Apr 24, 2024 10:15 am

Non conductive mast ? That's what you need and you need a ground plane which is typically 4 x 102 inch radials at 45 degrees on the "earth" side of the coax otherwise it will not be a match to 50 Ohms.

If you have radials and a non conducting mast it is something close by to the antenna knocking it out. Maybe a gutter, water tank ? In your or neighbours house.

If you are unlucky some concrete has mild steel rods in it to strengthen, even a close, sloping wet roof wall can do it.

A photo or 2 would be very helpful as we cannot know how you have configured this tank whip presumably on a 3/8 inch mount of some kind. Some 1/4 waves can be mounted on a specific size pole so can probably be put on metal pole but I would tend not to if I had a choice.

There is a slight chance if you do not have any radials and put a 102 inch whip on the garden grass it may have an ok SWR. An ok SWR is a good start but it does not mean it is a good antenna as the ground itself will be potentially acting as a very lossy ground plane. However, I suspect this is not the case and you have some other installation issue.

Photo's will help.

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