Figure 2 CQ21 21 Element Curtain Quad for 1296 MHz.

Back to The Curtain Quad http://home.comcast.net/~ross_anderson/CurtainQuad.htm

Figures 2a and 2b. These drawings of CQ21 were created by 4nec2. The dimensions of this antenna can be found in the program listing below and are repeated here for convenience.

All wires are #12 copper, with radius of 0.0404 inch.

All vertical wires are h = 6.08 inches long.

The center column of horizontal wires are l0 = 1.08 inches (read this as l zero is 1.08 inches).

The columns of horizontal wires next to the central column are l1 = 3.75 inches.

The next columns are l2 = 4.50 inches.

The outside columns of horizontal wires are l3 = 4.00 inches.

Figures 2c and 2d. These plots for the CQ21 antenna were created by 4nec2 using the program below.

CM CQ21 21 element Curtain Quad from W1HBQ

CE This program is written in 4nec2

SY l0=1.08 'The 21 horizontal wires represent 21 elements

SY l1=3.75 'All dimensions are in inches

SY l2=4.50 'All wires are #12 copper

SY l3=4.00

SY h=6.08 'The vertical wires are all the same length

SY y0 = .5 * l0

SY y1 = y0 + l1

SY y2 = y1 + l2

SY y3 = y2 + l3

SY z0=0

SY z1 = h

SY z2 = z1 + h

SY z3 = z2 + h

GW 1 11 0 y0 z3 0 y1 z3 0.0404

GW 2 2 0 0 z2 0 y0 z2 0.0404

GW 3 11 0 y1 z2 0 y2 z2 0.0404

GW 4 11 0 y0 z1 0 y1 z1 0.0404

GW 5 11 0 y2 z1 0 y3 z1 0.0404

GW 6 2 0 0 z0 0 y0 z0 0.0404

GW 7 11 0 y1 z0 0 y2 z0 0.0404

GW 8 11 0 y0 -z1 0 y1 -z1 0.0404

GW 9 11 0 y2 -z1 0 y3 -z1 0.0404

GW 10 2 0 0 -z2 0 y0 -z2 0.0404

GW 11 11 0 y1 -z2 0 y2 -z2 0.0404

GW 12 11 0 y0 -z3 0 y1 -z3 0.0404

GW 13 13 0 y0 z3 0 y0 z2 0.0404

GW 14 13 0 y0 z2 0 y0 z1 0.0404

GW 15 13 0 y0 z1 0 y0 z0 0.0404

GW 16 13 0 y0 z0 0 y0 -z1 0.0404

GW 17 13 0 y0 -z1 0 y0 -z2 0.0404

GW 18 13 0 y0 -z2 0 y0 -z3 0.0404

GW 19 13 0 y1 z3 0 y1 z2 0.0404

GW 20 13 0 y1 z2 0 y1 z1 0.0404

GW 21 13 0 y1 z1 0 y1 z0 0.0404

GW 22 13 0 y1 z0 0 y1 -z1 0.0404

GW 23 13 0 y1 -z1 0 y1 -z2 0.0404

GW 24 13 0 y1 -z2 0 y1 -z3 0.0404

GW 25 13 0 y2 z2 0 y2 z1 0.0404

GW 26 13 0 y2 z1 0 y2 z0 0.0404

GW 27 13 0 y2 z0 0 y2 -z1 0.0404

GW 28 13 0 y2 -z1 0 y2 -z2 0.0404

GW 29 13 0 y3 z1 0 y3 z0 0.0404

GW 30 13 0 y3 z0 0 y3 -z1 0.0404

GX 100 010 'symmetry in y direction

GS 0 0 0.0254

GE 0

LD 5 0 0 0 58000000 0 'copper wires

EX 0 6 1 0 1 0

GN -1

FR 0 1 0 0 1296 0 'frequency is 1296 MHz