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 SIRIO 827 ... MODIFYING RADIALS

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The DB
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PostSubject: SIRIO 827 ... MODIFYING RADIALS    Sirio - SIRIO 827 ... MODIFYING RADIALS  Icon_minitimeSun May 16, 2021 11:45 am

GOOD MORNING ALL

     Been thinking about replacing the radials with copper rods , available from eBay quite cheaply ,  in the correct diameter and length , I am at the stage of putting this into practical , thinking along the lines of removing the rods with there copper connectors and coating copper rods with clear  coat to stop them tarnishing , alloy conducts at around 60% where as coper conducts at about 99% theory should give good results may even look at replacing the whole antenna section by section for copper tubes , input ,advise ,  greatly received

 all the best
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kilomike
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PostSubject: Re: SIRIO 827 ... MODIFYING RADIALS    Sirio - SIRIO 827 ... MODIFYING RADIALS  Icon_minitimeSun May 16, 2021 11:49 am

Hi, I'm not sure if you would see any benefits in doing so to be honest
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PostSubject: Re: SIRIO 827 ... MODIFYING RADIALS    Sirio - SIRIO 827 ... MODIFYING RADIALS  Icon_minitimeSun May 16, 2021 4:54 pm

I know, 60% difference seems big but...

To put this in perspective, the difference in resistance between copper, which is the most conductive metal used for antennas and stainless steel, the least conductive metal used for antennas is 0.0000006732 ohms (or 6.732 micro ohms) per meter squared.

Its a case of perspective, from one perspective, what is actually a very small difference in the real world is made to sound much bigger than its real world effects.  When it comes to metals, however, the reality is when you get past a certain point (such as five or six 0's in an exponent) even a large percentage difference in conductance/resistance really doesn't mean much.

Also, we are talking radials, which when set up properly don't actually radiate any significant amount...


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PostSubject: Re: SIRIO 827 ... MODIFYING RADIALS    Sirio - SIRIO 827 ... MODIFYING RADIALS  Icon_minitimeSun May 16, 2021 8:18 pm

The DB wrote:
Also, we are talking radials, which when set up properly don't actually radiate any significant amount...
M0MSN has just done a good video on Youtube demonstrating this with an EMF meter to demonstrate this with ground radials. It was only when running a couple of hundred watts, almost touching the radials and within a few metres of the antenna that he started to get any readings. 

https://youtu.be/_wJVo9vluFI

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PostSubject: Re: SIRIO 827 ... MODIFYING RADIALS    Sirio - SIRIO 827 ... MODIFYING RADIALS  Icon_minitimeSun May 16, 2021 8:59 pm

I can understand your thoughts on it. I had similar thoughts in the past. From my experiments I deduced no noticeable difference when changing the material used for the radiator or ground planes on a 1/4 ground plane antenna (I know not the same as yours but still a radiating element and ground planes). The only thing that did change going from steel, to ali to copper was the sizes.

I did choose copper to make a 1/4 radiating element earlier this year, but that was only because I got a nice new piece of tubing cheap and it's loft mounted, so no wind. Unless you find some very thick copper tubing I wouldn't try swapping out the whole antenna section because copper of the same thickness as your current tubing will bend in the wind and stay bent.

If you just want to make your antenna look a little different, then there's no harm swapping out those radials. It would just be a cosmetic choice though. Personably I like the copper look.. I named my 1/4 Ygritte (from game of Thrones) because of it's two legs and copper colouring. ..you probably didn't need to know that bit.
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PostSubject: Re: SIRIO 827 ... MODIFYING RADIALS    Sirio - SIRIO 827 ... MODIFYING RADIALS  Icon_minitimeTue Jun 15, 2021 11:58 am

Take note guy's.
A5H5ATAN1C knows everything

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