For: Dx portion 11 meter band LIONEL
Antenna Type: 8el Yagi-Uda (owa)
Designed by: 19DX348 version 1.00 APRIL 2013
This antenna was designed for those real QRO guys who care less about front to back but focus on gain and power from an easy to construct antenna.
If you want to push those Kw’s on the SUPERBOWL or want work that DX…..
This antenna will handle it.
Please isolate all element in such a way they are isolated against a couple thousand KV’s.
The stability of the antenna speaks for it self.
A working horse !
Boom length: 16,4 Meter
Design freq: 27.555 Mhz
Gain: 12,71 dBI
Front to Back: < 25 dB
Impedance: 50 ohms (split element) direct fed.
SWR 1:1 : 1000 Khz
SWR below 2:1 : > 2000 Khz
Above the freespace azimuth plot at 27 MHz
Above the azimuth plot for 27,555 MHz.
Above the Azimuth plot for 28 MHz
Above the stable 50 OHms SWR bandwidth.
Frequency versus Gain / Front to back and Front to rear.
DIMENSIONS
All elements are made out of 1 inch and 7/8 inch aluminium tubing.
The center piece of 1 inch is 2 meters long.
At the end 7/8 tubing needs to be inserted to make
up for the full element length….
DO NOT CHANGE DIAMETERS OR LENGTH
ELEMENT LENGTHS :
Reflector length = 5.528 M
Radiator length = 5.298 M
Director 1 length = 4,980 M
Director 2 length = 4,970 M
Director 3 length = 4,910 M
Director 4 length = 4,770 M
Director 5 length = 4,840 M
Director 6 length = 4,580 M
Yes Director 5 is longer then director 4 !
ELEMENT DISTANCES:
Reflector to radiator = 1,24 M
Reflector to director 1= 1,82 M
Reflector to director 2= 3,8 M
Reflector to director 3= 6,2 M
Reflector to director 4= 9,8 M
Reflector to director 5 = 13,15 M
Reflector to director 6 = 16,4 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.
If you need any futher information, please feel free to ask.
Kind regards,
Henry HPSD, 19DX348