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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TowerTalk\]\s+DIR\-DE\-DIR\s+on\s+a\s+40m\s+yagi\s+\?\s*$/: 10 ]

Total 10 documents matching your query.

1. [TowerTalk] DIR-DE-DIR on a 40m yagi ? (score: 1)
Author: "jim.thom jim.thom@telus.net" <jim.thom@telus.net>
Date: Sun, 14 Nov 2021 14:16:23 -0800
You folks that have stepIR 3 el yagis..... I believe you can reverse the pattern 180 degs.... by turning the DIR into a REF...and vice-versa. Question is, can you make BOTH parasitic elements into Di
/archives//html/Towertalk/2021-11/msg00046.html (7,870 bytes)

2. Re: [TowerTalk] DIR-DE-DIR on a 40m yagi ? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Sun, 14 Nov 2021 14:51:02 -0800
Most of their Yagis, including the original 3-el that I have, have front panel button on the controller for Normal, Reverse, and Bi-Directional. I haven't looked at how the elements are programmed fo
/archives//html/Towertalk/2021-11/msg00047.html (7,797 bytes)

3. Re: [TowerTalk] DIR-DE-DIR on a 40m yagi ? (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sun, 14 Nov 2021 18:36:57 -0700
If you want to make a 3 or 2 element array be bidirectional, tune the parasitic elements to the driven frequency.  Don't make it shorter or longer.  You can run that through EZNEC if you don't believ
/archives//html/Towertalk/2021-11/msg00048.html (8,319 bytes)

4. Re: [TowerTalk] DIR-DE-DIR on a 40m yagi ? (score: 1)
Author: Mark - N5OT <r-emails@n5ot.com>
Date: Mon, 15 Nov 2021 09:43:39 -0600
Dave, Is there an optimal element spacing for this design?  I'd run it through the computer except that computer's at home and I'm not. 73 - Mark N5OT If you want to make a 3 or 2 element array be bi
/archives//html/Towertalk/2021-11/msg00050.html (8,118 bytes)

5. Re: [TowerTalk] DIR-DE-DIR on a 40m yagi ? (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Mon, 15 Nov 2021 10:29:49 -0700
I'd have to run it through EZNEC to see what the best spacing is, but the "best" spacing may vary depending upon things like bandwidth versus gain.  I'll assume that you want maximum gain, but I won'
/archives//html/Towertalk/2021-11/msg00051.html (9,126 bytes)

6. Re: [TowerTalk] DIR-DE-DIR on a 40m yagi ? (score: 1)
Author: Gedas <w8bya@mchsi.com>
Date: Tue, 16 Nov 2021 14:14:48 -0500
A couple years ago when I was into 6m MS I was using an old CC 5-elem yagi at 75'. It worked very well and I was able to make hundreds of QSO's out past 1000 miles pretty much at will. Along came som
/archives//html/Towertalk/2021-11/msg00054.html (11,575 bytes)

7. Re: [TowerTalk] DIR-DE-DIR on a 40m yagi ? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Tue, 16 Nov 2021 11:21:52 -0800
Hi Gedas, The only important reason for "fixing" it would be reducing RX noise. 73, Jim K9YC _______________________________________________ _______________________________________________ TowerTalk
/archives//html/Towertalk/2021-11/msg00055.html (8,495 bytes)

8. Re: [TowerTalk] DIR-DE-DIR on a 40m yagi ? (score: 1)
Author: Gedas <w8bya@mchsi.com>
Date: Tue, 16 Nov 2021 15:10:32 -0500
Hi there Jim. Hope you are doing well and staying safe. Fortunately for me I live out in the country and while there is a farm house etc that can sometimes generate some noise for the most part (knoc
/archives//html/Towertalk/2021-11/msg00056.html (9,434 bytes)

9. Re: [TowerTalk] DIR-DE-DIR on a 40m yagi ? (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Tue, 16 Nov 2021 15:03:21 -0700
I just got the chance to play with this in EZNEC+. A 2-element version for 40m at 90 feet up in the air seemed to optimize at 67.6 foot element lengths spaced 20 feet apart.  The main lobe was 10.65
/archives//html/Towertalk/2021-11/msg00057.html (10,847 bytes)

10. Re: [TowerTalk] DIR-DE-DIR on a 40m yagi ? (score: 1)
Author: W0MU Mike Fatchett <w0mu@w0mu.com>
Date: Tue, 16 Nov 2021 17:05:32 -0700
That 3 element gets quite large for the a couple of DB.  Interesting the magic 20 ft number for 2 elements on 40.  That has been the standard for a while. W0MU I just got the chance to play with this
/archives//html/Towertalk/2021-11/msg00058.html (11,778 bytes)


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