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Asunto:[dxcolombia] 4Square 80M
Fecha:Miercoles, 16 de Mayo, 2007  16:13:40 (-0400)
Autor:Alexis Deniz M. 4M5DXgroup <yv5ssb @...net>

Home  |  The Shack  |  40M Array  |  20M Yagi  |  15 & 10m Yagis  |  Aquarium

 

80/75 Meter 4-Square Array

CLICK ON IMAGES FOR LARGER VERSIONS

http://www.bctonline.com/~skelly/4square/4sq01_small.jpg

This array has been in use since 1989.

The SWR from 3.5 to 3.9 is below 1.5:1

The F/R of the array is 20dB average and with some signals even better.

http://www.bctonline.com/~skelly/4square/4sq03_small.jpg

View of the 4-Square from the top of one of my towers.  (Approx 125 feet high)

The radial system consists of 90 1/4 wave long wires attached to the base of each vertical.

http://www.bctonline.com/~skelly/4square/4sq02_small.jpg

Close-up picture of the support post and base of the vertical.

Each vertical is mounted on a 6 inch square by 12 foot long pressure treated post.

The posts were buried 4 feet in the ground.

http://www.bctonline.com/~skelly/4square/k7em_4-square_vertical.jpg
CLICK TO ENLARGE
(File Size 100K)

Construction Detail (Revised 4-14-2001)

  • The verticals are 65' tall.  40 feet of 4" and 25 feet of 3"  aluminum irrigation tubing.  The joint overlap is 1'.
  • I have replaced the UV resistant bale twine (guy ropes) with 3/16" (770lb. tensile strength) UV resistant Dacron rope.  

You can also find this image on page 9-57 of ON4UN's - Low Band DXing Book, 3rd edition.

CLICK HERE to download a Windows MetaFile (.WMF) version of this drawing. (File Size 28K)

http://www.bctonline.com/~skelly/4square/support_post_detail.jpg
CLICK TO ENLARGE
(File Size 100K)

Support Post Detail (Revised 4-14-2001)

  • Each support post is 6" x 6" x 12' pressure treated.  4' of the post is in the ground..
  • The vertical is insulated from the post by PVC electrical conduit.
  • The support arms are made from 1/2" thick Plexiglass (Acrylic) sheet.

You can enlarge the image by clicking on it OR download a Windows MetaFile version by CLICKING HERE.

CLICK HERE to download a Windows MetaFile (.WMF) version of this drawing.  (File Size 28K)

 

http://www.bctonline.com/~skelly/4square/4_inch-to-3_inch_joint_detail.jpg
CLICK TO ENLARGE
(File Size 100K)

Joint Construction Detail (Revised 4-14-2001)

  • I used a 1 foot overlap at the joint between the 4" and 3" tubing.
  • 3-1/2" Sch. 40 Aluminum conduit (pipe) has to be machined to fit inside the 4" irrigation tubing.
  • 3" Sch. 40 aluminum conduit (pipe) is used to transition from the 3-1/2" conduit to the 3" irrigation tubing.  No machining required on this sleeve.

CLICK HERE to download a Windows MetaFile (.WMF) version of this drawing.  (File Size 28K)

 

http://www.bctonline.com/~skelly/4square/tstorm05_small.jpg

THUNDERSTORM!!

Check out these pictures of a thunderstorm that was a bit too close for comfort.  Fortunately the cell didn't move directly over the array.  It sure came close though.

 

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