For:             DX portion 11 meter band

Antenna Type:   7el OWA “MACO tubing”

Designed by:    HPSD 2012 ?
Boom length:    11,66 Meter
Gain:         11,64 dBI (@27,025 Mhz)
FB            <30 dB
FR            <24 dB
Impedance:         50 ohms, direct fed
SWR below 1:1.1     > 400 Khz.
SWR below 2:1    > 1800 Khz

   

 

 

 

 

The basic of the antenna lies within the “OWA” style familly. That indicates: all elements are straight and the impedance is 50 Ohms so it is relative simple to construct and will not provide issues if the amplifier is “heat up”. WIth those basic “traditions” this antenna allready produces 11,64 dBI gain for those who are keen on “super bowl” .

Best of all…it wont need any adjustments if you want to turn the antenna to Europa on 27,555 MHz and give a call before you QSY to and enjoy the EU pile up !

 ELEMENT DIAMETER

Each element is made out of tubing "maco" uses.
In metric this will be : 15,875mm diameter (5/8 inch) for the central part of the element, which is 1,8288 Meter long.
Inserted goes the 12,7 mm diameter tubing (1/2 inch) to make up for the rest of the element length.

DO NOT CHANGE ELEMENT DIAMETERS OR INDIVIDUAL SECTION LENGTHS.

ELEMENT DISTANCES

Reflector - radiator :    1,47 Meter
Reflector - director 1 :  1,97 Meter
Reflector - director 2 :  3,38 Meter
Reflector - director 3 :  5,54 Meter
Reflector - director 4 :  8,84 Meter
Reflector - director 5 :  11,661 Meter

ELEMENT LENGTHS:

Reflector: 5,664 Meter
Radiator:  5,5 Meter
Director 1: 5,224 Meter
Director 2: 5,10 Meter
Director 3: 5,00 Meter
Director 4: 5,07 Meter
Director 5: 4.94 meter

(yes director 4 is longer then nr 3)

 FEEDING THE ANTENNA:

The antenna has 50 ohms impedance. It can be "direct" fed.
All you need to do is split the radiating element in half, isolate it from the boom and attach the coax on it.
Of course a RF choke / 1:1 balun is advised.