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Author Topic: What is the difference between F/B and F/R of a yagi  (Read 534 times)

OK4FX

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Re: What is the difference between F/B and F/R of a yagi
« Reply #15 on: March 31, 2023, 01:39:47 AM »

When you come across a page with too large images, you can use the so-called Bookmarklets.
Current browsers no longer allow inserting javascript directly into the address bar, but it is possible to bypass this by saving the javascript to Favorites, which then looks like this in the Firefox browser:



Then write the desired javascript in the URL field, for example to shrink all images larger than 800px to 800px:

Code: [Select]
javascript:var%20i,L=document.images.length;for(i=0;i<L;++i){document.images[i].style.maxWidth='800px'};false();
Then, when you come across a page that you wish to reduce the images on, just click on that Favorite.
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Mira OK4FX

N0GV

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Re: What is the difference between F/B and F/R of a yagi
« Reply #16 on: April 03, 2023, 12:05:39 PM »

Updated plots:




Probably easier to view on your browser.

Grover
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VR2AX

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Re: What is the difference between F/B and F/R of a yagi
« Reply #17 on: April 03, 2023, 12:57:26 PM »

Maybe 10  or even 15 (?) better comparators?
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WB6BYU

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Re: What is the difference between F/B and F/R of a yagi
« Reply #18 on: April 03, 2023, 01:15:44 PM »

A good example of the difference between Front/Back and
Front/Rear is this pair of Moxon patterns from DK7ZB.




The first shows a clean rear pattern, good Front/Rear over
180 degrees.  The second has a deep null directly off the
back (good Front/Back), but much stronger pattern
approaching 90 degrees from the rear null, so the
Front/Rear is not as good.
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