| Author |
Message |
    
26_op_141
Member
Username: 26_op_141
Post Number: 56
Registered: 2-2005
| | Posted on Thursday, November 10, 2005 - 11:15 am: | 
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Hi Guys,
I need to stack (co-phase) two 4 element yagis flat side and incorporate my shakespear 2010 at our Orient Pirate club station.See my attached pic.
What height does "Y" need to be for supporting the Yagis? I dont want the 24' alloy boom interfering with the yagis pattern. Also the vertical support for the 2010 is this ok in alloy? I need the top part of the "H" boom to made of alloy for strength.We have high winds at our club HQ.
TNX
73
Tim
26 OP 141
Orient Pirate Radio Group |
Tech291
Moderator
Username: Tech291
Post Number: 283
Registered: 11-2004
| | Posted on Thursday, November 10, 2005 - 7:15 pm: |
|
Tim,
From what I gather from your drawing,Your wanting to run the yagi's horizontal.It would make more sense to cut windload and torque problems by stacking one above the other on the mast.seperating them from 1/4 to 1/2 wavelangh apart.mounted that way the 2010 could be mounted on the mast directly above the upper yagi.
tech291
cef#291
kc8zpj
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26_op_141
Member
Username: 26_op_141
Post Number: 57
Registered: 2-2005
| | Posted on Friday, November 11, 2005 - 6:46 am: |
|
291,
Yes i thought of this too. However I thought the yagis had to be at least 3/4 wave apart to get the additional gain 3db? hence the 24' spacing??
If the yagis are too close sureley the patterns wont be any different to a single yagi??
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26_op_141
Member
Username: 26_op_141
Post Number: 60
Registered: 2-2005
| | Posted on Friday, November 18, 2005 - 10:39 am: |
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Guys,
Any ideas??.... Surely someone on the forum must have knowledge on stacking yagis?
73
Tim
26 OP 141 |
Tech291
Moderator
Username: Tech291
Post Number: 293
Registered: 11-2004
| | Posted on Saturday, November 19, 2005 - 9:08 am: |
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Tim,
Done a little more research for you and here is what I found.
http://www.cebik.com/yagi/stack0.html
the material is copyrighted so it couldnt be posted in the forum.Hope this helps.
tech291
cef#291
kc8zpj
|
26_op_141
Member
Username: 26_op_141
Post Number: 61
Registered: 2-2005
| | Posted on Monday, November 21, 2005 - 9:57 am: |
|
Tnx 291,
Much appreciated. A good read with lots of info for me to try.
73
Tim |
