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Acrylic sheet for antenna

Apr 8th 2018, 14:34

W0DBB

Joined: Nov 29th 2017, 18:15
Total Topics: 0
Total Posts: 0
Is a 1/4" thick sheet of acrylic considered a insulator (dialectric?).

I saw a 2m/70cm vert. dipole by Dave Tadlock. He used a 1/4"x18"x2.5" acrylic plate to mount the 2 elements. They are being held stationary by only 1 bolt each.

I want to cut a T shape vs. a rectangle then use a metal bolt as he describes THEN for more movement security, a nylon bolt further up between each bent elements.

==================== plate edge + 2m element
O. O. (1st bolt stl. 2nd nylon)
=========_____________ plate edge + 70cm element


Hope diagram makes sense!!

Dave Tadlock's antenna: (google / homebrew 2m/70cm vertical dipole antenna)

73s
Colin, W1EEK
Apr 9th 2018, 09:50

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0

Acrylic has good scratch resistance and optical clarity, but tends to be weak and brittle, so it is a surprise that his antenna lasted so long.

I prefer to use Lexan or polycarbonate as an low impedance antenna feedpoint insulator.

Zak W1VT
ARRL Senior Lab Engineer

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