Home made antennas.

[mozquito1]

The antennas I made in about an hour a piece. For less than £4 each.
The only thing is they have not been tested yet.
Apparently using 10 awg you do not have to have a wave trap. But it does have to be 0.4mm from the plate.

So this is what I come up with for 0.4mm off the ground plate.

I will have to test it on all channels & bands to see which is best. Same withe the omni. I have not got a printer so I had to dig on the info to draw a former template for 5.8ghz. If anyone wants the info I'll post it.

 

[mozquito1]

If you know what a wavelength is then you will know what a quarter wavelength is & this diagram will make sense.

 

[mozquito1]

d= diameter of wire
L=length of the coil
S=1/4 wavelength 11.8mm
D=diameter of former 17.5mm
a=space between coil & reflector plate
R=reflector size 40-50mm

 

[Gyro Doctor]

... ... Well done Moz !
Now just toss those puppies on a spectrum analyzer and check the frequency response.
Oh, and some polar coordinate graphs of the radiation parameters would be nice too.
(nyuck nyuck ... oh, I wise guy heh?)

 

[mozquito1]

You seen how much they cost.

 

[Gyro Doctor]

You seen how much they cost.

Yep, they ain't cheap, and it's not like there's a whole lot to 'em anyway !

 

[Jackson]

Lotsa stuff here for the DIY crowd.

https://farvew.com/27-antenna-kits