For: Dx portion 11 meter band 56SD113
Antenna Type: Yagi-Uda (F-yagi)
Designed by: HPSD version 1.01 feb 2013
Boom length: 18 Meter
Gain: 13,3 dBI
Front to Back: < 30 dB
Impedance: 50 ohms (split element) direct fed.
SWR below 1:1,5 : > 600Khz
The Azimuth plot at 27, 555 Mhz
13,3 dBI Gain and 30,41 dB front to back.
The freespace elevation plot at 27,555 Mhz
All elements are made out of 3 meter 22 mm tubing and 18 mm end pieces
DO NOT CHANGE DIAMETER.
The individual elements of the folded dipole are seperated 11 CM
Type Distance Length
Reflector 0 5,640
Folded dipole 0,378 M 2,630 M
Director 1 0,988 M 2,613 M
Director 2 2,836 M 2,513 M
Director 3 6,067 M 2,467 M
Director 4 9,905 M 2,430 M
Director 5 14,130 M 2,390 M
Director 6 17,760 M 2,345 M
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.
Other diameters…questions….feel free to mail !