4,20 M 3el Cubical Quad 9,43 dBi

For:             DX portion 11 meter band
Antenna Type:    3el  Cubical Quad

Designed by:    HPSD version 1.01 jan 2008

(updated with NEC5 2025)

Boom length:     4,2 Meter
Gain:         9,43 dBI (@27,555 Mhz)
FB            <30 dB
FR            <20 dB
Impedance:         50 ohms, direct fed
SWR below 1:1.1     > 100 Khz.
SWR below 2:1    > 600 Khz

4,20 3el cubical quad wires

 

4,20 azimuth 3el cubical quad

Above the freespace azimuth plot

 

elevation 3el 4,20 cubical quad

 

Above the freespace elevation plot

Very tight for a 3el !

 

4,20 3el quad swr

 

Above the SWR diagram.

 

4,20 3el CUbical  quad gain fb fr versus frequency

Above the gain, front to back and front to rear response versus frequency.

11 meter high 3el 4,20 Cubical Quad

The elevation plot when placed 11 meters above average ground conditions

 

18 meter high 3el 4,20 Cubical Quad

The elevation plot when placed 18 meters above average ground conditions.

 

 

Element Diameter

The wires consist of 3mm thick diameter “bare” copper wire. WITHOUT THE ISOLATION.

DO NOT USE OTHER DIAMETERS

 Element distances:

Reflector to radiator = 2,1 Meter

Reflector to director 1 = 4,2 Meter

Element length:

(per side so total length x 4)

Reflector = 2,880 Meter

Radiator = 2,790 Meter

Director =  2,693 Meter

 

FEEDING THE ANTENNA:

The antenna has a 50 ohm impedance. It can be direct fed. (1-1 balun is preffered).

 



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