ARLA/CLUSTER: antena para TDT

[CT1BAT]

Caros Amigos,

Com o devido respeito… discutir os 125 mm de cabo “arregaçado” não “recebe a
TDT” (eh eh)

Quem se quiser entreter, aqui vão os dados para uma diretiva até 5 elementos
diretores e 11,7 db de ganho, 

devidamente testada e com os créditos a VK5DJ!

Bom trabalho e…TDT a 100%!

 

73 de

José Machado – CT1BAT

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VK5DJ's YAGI CALCULATOR

 

Yagi design frequency =754,00 MHz

Wavelength =398 mm

Parasitic elements contacting a square section metal boom 20,00 mm across.

Folded dipole fully insulated from boom

Director/reflector diam =6 mm

Radiator diam =6 mm

 

REFLECTOR

208 mm long at boom position = 30 mm  (IT = 94,0 mm)

 

RADIATOR

Single dipole 184 mm tip to tip, spaced 80 mm from reflector at boom posn
110 mm (IT = 82,0 mm)

Folded dipole 187 mm tip to tip, spaced 80 mm from reflector at boom posn
110 mm (IT = 83,5 mm)

 

DIRECTORS

Dir          Length  Spaced Boom position  IT            Gain      Gain

(no.)      (mm)    (mm)    (mm)                    (mm)    (dBd)    (dBi)

1             181         30           139                        80,5
3,7          5,8

2             179         72           211                        79,5
5,9          8,0

3             177         85           296                        78,5
7,4          9,5

4             175         99           396                        77,5
8,6          10,7

5             173         111         507                        76,5
9,5          11,7

 

COMMENTS

The abbreviation "IT" means "Insert To", it is the construction distance
from the element tip to the edge of the boom for through boom mounting

 

Spacings measured centre to centre from previous element

Tolerance for element lengths is +/- 1 mm

 

Boom position is the mounting point for each element as measured from the
rear of the boom and includes the 30 mm overhang.The total boom length is
537 mm including two overhangs of 30 mm

 

The beam's estimated 3dB beamwidth is 53 deg

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