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Author Topic: Radials for vertical antenna  (Read 408 times)
KC6SLA
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Posts: 35




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« on: August 21, 2008, 04:12:25 PM »

I know radials make a difference when transmitting but how much is the recieve performance enhanced when radials are added?
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W1NK
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Posts: 433


WWW

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« Reply #1 on: August 21, 2008, 04:35:02 PM »

While I am unable to give you specifics, let me refer you to Steve, WB2WIK/6's magnum opus on verticals and radials.  It's interesting what he found when monitoring CHU and then adding or subtracting radials.

http://www.eham.net/articles/4148

Frank, W1NK
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K0OD
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Posts: 2557




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« Reply #2 on: August 21, 2008, 05:44:46 PM »

"how much is the receive performance enhanced when radials are added?"  

I presume you're referring to HF. With modern receivers adding radials, at best, will be like turning up the gain a bit or sitting nearer to the speaker. No Big Deal.

Read this article. Note that even on transmit, going from a simple radial system to a very extensive one does very little unless you're using a shortened vertical.  

http://www.antennasbyn6lf.com/
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WW5AA
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Posts: 2086




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« Reply #3 on: August 22, 2008, 07:05:48 AM »

My inverted "L" for 160 meters gained approx 18 DBI when going from 6 radials to 60 radials, 60-75' in length. In my case I would say it made a big difference.

73 de Lindy
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K0OD
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Posts: 2557




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« Reply #4 on: August 22, 2008, 08:19:01 AM »

"My inverted "L" for 160 meters gained approx 18 DBI when going from 6 radials to 60 radials, 60-75' in length. In my case I would say it made a big difference."

---
Assuming you had a 1/10th decent 160 antenna to begin with (and not a mobile whip), then you should generate a huge pile of Europeans every time you transmit. Smiley

You do understand that on some radios an s-unit can be as little as one or two dBs.

My own long experience with radials/inverted L's tracks the published studies: lots more copper equals no discernible improvement on transmit (<3dB). And CERTAINLY no improvement in my ability to copy weak signals.

Low band contesters/DXers would kill for even 3 dB. If huge radial fields were the answer, then my 1 acre yard would be solid copper.

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By the way, did you read what N6LF discovered about using 4 radial? PERHAPS using 6 is also very bad practice?

http://www.antennasbyn6lf.com/


 
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