For: Dx portion 11 meter band 21 DX014
Antenna Type: Yagi-Uda (owa)
Designed by: 19DX348 version 1.01 MRT 2012
Boom length: 9,12 Meter
Gain: 10,5 dBI
Front to Back: > 29 dB (@27,555)
Impedance: 50 ohms (split element) direct fed.
SWR 1:1 : 1000 Khz
SWR below 2:1 : > 2Mhz
Above at 27 Mhz 10,1 dBI Gain and 16,69 dB front to back.
Above: At 27,555 M hz 10,49 dBI gain and 29,87 dB front to back
C
Above: at 28 Mhz 10,76 dBI gain, and 24,76 dB front to back
Above at 28,5 Mhz : 10,82 dBI and 19,09 front to back.
Above the predicted SWR. 50 ohms direct impedance ! and below 1:1 over 1200 Khz !
Gain / front to back/ Front to rear versus frequency
Dimensions:
All elements are made out of 22 and 18 mm aluminium tubing.
The center piece of 22 mm is 3 meters long. At the end 18mm tubing needs to be inserted to
make up for the full element length….
DO NOT CHANGE DIAMETERS OR LENGTH
LENGTH:
Reflector length = 5.450 M
Radiator length = 5.360 M
Director 1 length = 5,010 M
Director 2 length = 4,870 M
Director 3 length = 4,870 M
Director 4 length = 4,590 M
DISTANCES:
Reflector to radiator = 1,73 Meter
Reflector to director 1= 2,26 Meter
Reflector to director 2= 4,22 meter
Reflector to director 3= 6,78 Meter
Reflector to director 4 = 9,12 Meter
Feeding the antenna:
The antenna is 50 ohms.
The radiator (and preferbly all elements) need to be isolated from the boom. The radiator
Can be split in half and be “direct” fed.
With this said…a 1:1 balun or RF choke is adviced.
Example of element attachement.
If you need any futher information, please feel free to ask.
Kind regards,
Henry HPSD, 19DX348