DX Engineering DXE-RCA8C-4S-INS Manual page 26

Endfire
Spacing
Distance
Between
Freq
Antennas
MHz
= 246/F
[feet]
1.800 136.67
1.825 134.79
1.830
134.43
160M only
1.860 132.26
3.500 70.29
67.40
3.650
3.800
80M only 64.74
or 160 & 80M
7.200
34.17
40M only
160/80/40M
special array* 38.6
(6.369 MHz)
Table 5 – Array Dimensional Layout (Highlighted figures are optimal for 1.83, 3.8 and 7.3 MHz)
*Special Array - See the discussion of patterns actually obtained with an Eight Circle Array radius
of only 50 feet in the preceding section
For optimal performance a Receive Eight Circle Array should be sized for a single band according
to the dimensions in Table 5
Radius of Circle
Radius of
One Half
Circle[feet] = 1/2
Distance
distance between
Between
antennas divided by
Antennas
sin 22.5 degrees
[feet]
(0.383)
68.33 178.6
176.1
67.40
67.21 175.64
66.13 172.8
35.14 91.8
33.70 88.1
32.37 84.58
17.09 44.66
19.3 50.5
Multi-Band Arrays with Active Elements.
- 26 -
Broadside
Spacing
Diameter,
Endfire
Diameters Spacing &
of Circles Broadside
[feet] Spacing
form a
triangle.
357.1 329.9
352.2
325.4
351.3 324.5
345.6 319.3
183.7 169.7
176.1 162.7
169.2 156.3
89.32 82.5
101.0 93.28
Broadside
Spacing as
a % of WL
0.604
0.604
0.604
0.604
0.604
0.604
0.604
0.604
0.604