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 Too radial or not too radial that is the question.

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Chickenfoot@1987
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Chickenfoot@1987


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Too radial or not too radial that is the question. Empty
PostSubject: Too radial or not too radial that is the question.   Too radial or not too radial that is the question. Icon_minitimeWed Sep 08, 2021 4:57 pm

I’m getting a new base antenna (again)I know if it’s not broken don’t fix it and all that but you know what we’re all like.Anyway the question is can an antenna be SWR’ed with the radials left off.I’m planning on not repeating the tuning carry on like last time and was going to erect a makeshift mast 20 feet up from the ground tune the antenna,Fit the radials that are 2m in length and 4 of them.Then position the thing up in the air Job done.The reasoning behind it was do those radials effect the SWR settings.
Thanks Tom.
26 CT 4029

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The DB
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Too radial or not too radial that is the question. Empty
PostSubject: Re: Too radial or not too radial that is the question.   Too radial or not too radial that is the question. Icon_minitimeWed Sep 08, 2021 6:52 pm

The matching circuit on the antenna is designed with radials of a certain length being present.  The same antenna with out said radials will have a different "impedance" and by extension higher SWR.  If your lucky, you could try adjusting the matching circuit, but very few have the range of adjustment to account this type of change.  It would be far far easier to find an antenna that isn't designed to need radials rather than remove the radials from an antenna that comes with them.

This is also not getting into other potential issues not having said radials might cause.  There is far more to removing radials than just getting a higher SWR.


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Chickenfoot@1987
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Chickenfoot@1987


Call Sign : 26-CT-4029
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Equipment Used : SS 9900/SS 6900N,crt Xenon export,Sirio GPE 5/8,Sirio P 5000,1/4 wave 9’ tank whip,moonraker Red Devil,ATU 100

Too radial or not too radial that is the question. Empty
PostSubject: Re: Too radial or not too radial that is the question.   Too radial or not too radial that is the question. Icon_minitimeWed Sep 08, 2021 8:18 pm

Thanks DB,I did have the feeling it would be important to make any adjustments while they were installed.After last times carry on with the Antenna I’ll erect a makeshift mast 10-15 feet off the ground make the correct SWR adjustments then remove radials as they are 2m in length,get the antenna back up on the roof reassembled and then fixed to swaged poles and bolted to the house.Last time I did it alone and it wasn’t fun nor clever holding on to a T&K bracket with one hand and am antenna with the other.Fresh pants were needed after that mission was accomplished..🤣
Helpers will be used next time around.
Thanks again DB
Tom. 26 CT 4029

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Too radial or not too radial that is the question. Empty
PostSubject: Re: Too radial or not too radial that is the question.   Too radial or not too radial that is the question. Icon_minitimeFri Sep 10, 2021 3:44 pm

As above you can tune it without the radials but it'll possibly have other consequences which may not become immediately obvious such as a change in the gain at different take off angles, especially lower ones.

Also If you tune the antenna on a 20ft mast on the ground then stick it up on the roof of your house if there's a significant change in height the tuning will change due to the change in ground losses. It's resonant point will probably rise a couple of hundred kHz so tune it slightly lower than you want it to be centred on.

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Chickenfoot@1987
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Chickenfoot@1987


Call Sign : 26-CT-4029
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Equipment Used : SS 9900/SS 6900N,crt Xenon export,Sirio GPE 5/8,Sirio P 5000,1/4 wave 9’ tank whip,moonraker Red Devil,ATU 100

Too radial or not too radial that is the question. Empty
PostSubject: Re: Too radial or not too radial that is the question.   Too radial or not too radial that is the question. Icon_minitimeFri Sep 10, 2021 5:29 pm

Northern Crusader,Now that’s even more valid points I didn’t take into consideration,That’s why we ask I suppose.The difference between temporary mast to tune on the ground and actually fixed position on the house is about 35-40 feet difference,So that idea is blown out the water..loi
I’ve now taken to the idea of getting half scaffolding erected just so tuning and fixing will be 10 times easier and a lot safer.
Health and safety would have crucified me.Thanks for the help and advice as it’s greatly appreciated and has pointed me in the right direction and no cutting corners.
Thanks again Tom.
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Too radial or not too radial that is the question. Empty
PostSubject: Re: Too radial or not too radial that is the question.   Too radial or not too radial that is the question. Icon_minitime

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