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Author Topic: A Simple ¼ λ Ground Plane for 2m  (Read 1612 times)
VU2NAN
Member

Posts: 237




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« on: December 06, 2012, 12:28:40 AM »

Here's the link.

http://nandustips.blogspot.in/2012/12/a-simple-ground-plane-for-2m.html

73,

Nandu.
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K1CJS
Member

Posts: 5855




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« Reply #1 on: December 06, 2012, 06:15:33 AM »

So?  This design (with variations) has been around for years.  This is supposed to be new?
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SWMAN
Member

Posts: 545




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« Reply #2 on: December 06, 2012, 06:47:12 AM »

Nandu,
Looks good and easy to make,  I will be making one for my super modified FT-60 this weekend, that is what I was looking for.
  Thanks, Jim  73  W5JJG
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VU2NAN
Member

Posts: 237




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« Reply #3 on: December 06, 2012, 07:50:50 AM »

Of course not, Chris!

Thanks, Jim!

73,

Nandu.
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WA2ROC
Member

Posts: 33




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« Reply #4 on: December 07, 2012, 05:03:40 AM »

SO-239 with 4 drooping 1/4 wave radials bolted to the mounting  holes with a 1/4 wave vertical  soldered to the center.  You can screw a PL-259 to the SO-239 and mount it to a the highest place you can reach.

Older than dirt!
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Dick Pettit
WA2ROC
Durham, NC

"All Vintage Heathkit,
All the Time"
N6AJR
Member

Posts: 9887




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« Reply #5 on: December 10, 2012, 01:30:43 PM »

I like to make these using a so 239 as the center part.  solder the 4 radials into the 4 mounting screwa and the center post holds the verticle part.  and it slides  perfectly in light conduit. and the coax screws in the bottom.
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N4CR
Member

Posts: 1650




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« Reply #6 on: December 10, 2012, 04:28:51 PM »

I don't use screws.

Bend the pair of radials in a U shape with a flat bottomed U that is the same width as the holes in the SO-239. Then drop the U in from the top and solder along one edge. Do this twice. Bend the radials out at a 45 degree angle. Solder in the radiator. Trim to tune.
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73 de N4CR, Phil

We are Coulomb of Borg. Resistance is futile. Voltage, on the other hand, has potential.
W9GB
Member

Posts: 2597




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« Reply #7 on: December 10, 2012, 06:54:18 PM »

Brass rod available at welding shops (brazing rod) OR craft-hobby stores is often used.
In 1970s, they would also buy glass beads/balls -- heat and place at end of rods for 1970s Bling.
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W5WSS
Member

Posts: 1631




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« Reply #8 on: December 10, 2012, 06:59:44 PM »

The antenna is allot different than a Ground Plane.

Since the elevated radials slope downward there is radiation contribution out in the vertical axis.

A Ground Plane incorporates horizontal radials and they cancel all but a remnant of  radiation contribution.

This antenna with sloping radials is better understood as a vertical dipole where two halves are center fed yes and usually the bottom half is symmetrically split into 4 parts.

I just wanted to help clarify that distinction.

This slope radial vertical dipole generates more manifested power expressed as gain beyond a quarter wave ground plane



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