VHF/UHF LFA-Yagis

On this page you find:

2m/144MHz LFA Yagis

https://www.wimo.de/bilder/17740.V-09_l.jpgLFA Yagis differs a lot from the traditional Yagi design.

The LFA ("Loop Fed Array") has a rectangular dipole with 1λ length. The dipole lies flat on the boom at the same level as the parasitic elements. The outer sides of the dipole run parallel to the boom and are designed to be exactly inversely phased (±180°).

This way signals eliminate each other on those sides resulting in much reduced side lobes, lower G/T values and a better front to back ratio.
This concept can be applied at almost any boom length. LFA Yagis have 50Ω impedance and get by without lossy transformation.

  144LFA5 144LFA7 144LFA8 144LFA9 144LFA11 144LFA13 144LFA16
Number of elements 5 7 8 9 11 13 16
Gain [dBi] 11,12 12,81 13,29 14,16 15,29 16,04 17,45
F/B [db] 19,76 22,44 25,69 24,13 28,59 26,4 33,7
SWR ≤ 1,4
Impedance 50Ω
Capacity [W] 5000
Length of boom [m] 1,82 2,95 3,77 4,50 6,15 7,90 10,92
Wind speed [km/h] ≤200 ≤160
Weight [kg] 1,8 2,1 3,1 4,5 6,2 7,2 9,2
Fore-mast Mounting No
Connector Screws
Order No. 17740.V-05 17740.V-07 17740.V-08 17740.V-09 17740.V-11 17740.V-13 17740.V-16
  99.00  137.00  143.00  182.00  226.00  269.00  311.00 

 

Cross Yagi (LFA) for 2m

https://www.wimo.de/bilder/17740.VX-32-1-l.jpgOur 2m, 2x16ele LFA crossed yagi attached to a 13m dish at the EME 2014 conference in Pleumeur-Bodou (France). After the QSOs it was a gift and the first prize of a lotery among all attendants of the conference.

16+16 LFA 11+11 LFA
Elements 16+16 11+11
Frequency Range 144.0 - 144.5 MHz
Gain 17.54 dBi 15.24 dBi
F/B 34.42 dB 38.78 dB
SWR 1,2:1 - 1,3:1 1,1:1 - 1,2:1
Impedance 50 Ω
Max. Power 10 kW*
Boom Length 11.17m 6.44m
Turning Radius 5.60m 3.31m
Wind Survival 160 km/h
Weight 20 Kg 10 Kg
Fore-mast Mounting No
Connector Screws
Shipping Dimension 17 x 11 x 255 cm t.b.d.
Order No. 17740.VX-32 17740.VX-22
396.00  330.00 

 

70cm/430MHz LFA-Yagis

https://www.wimo.de/bilder/17740.U-30_17740.V-16_l.jpgAs with the 2m antennas, 430MHz directional antennas are manufactured according to the LFA concept.

  432LFA15 432LFA18 432LFA23 432LFA30
Number of elements 15 18 23 30
Gain [dBi] 15,69 18,01 19,15 20,45
F/B [db] 32,87 42,32 37,48 44,32
SWR ≤2
Impedance 50Ω
Capacity [W] 5000
Length of boom [m] 3,22 4,30 5,90 8,25
Wind speed [km/h] ≤200 ≤160
Weight [kg] 3,8 4,1 4,9 6,9
Fore-mast Mounting No
Connector Screws
Order No. 17740.U-15 17740.U-18 17740.U-23 17740.U-30
146.00  176.00  246.00  275.00 

 

144MHz/430MHz Duoband directional antennas DK7ZB Design

https://www.wimo.com/bilder/17740.D5-8_l.jpgDuoband antennas consist of two monoband antennas that are nested in each other on a single boom. Therefore only one coax cable is required for feeding.

EA270ZB9 EA270ZB13
Frequency range [MHz] 144-146 432-440 144-146 432-440
Number of elements 4 5 5 8
Gain [dBi] 9,35 10,7 10,8 11,0
F/B [db] 11,7 9,7 18,7 15,4
SWR ≤1,5
Impedance 50Ω
Capacity [W] 500
Length of boom [m] 1,20 1,51
Fore-mast Mounting No
Connector Screws
Weight [kg] 1,25 1,37
Order No. 17740.D4-5 17740.D5-8
69.00  83.00 


6m/50MHz LFA directional antenna

https://www.wimo.de/bilder/17740.6-4_l.jpgAs with the 2m antennas, 50MHz directional antennas are manufactured according to the LFA concept.

  50LFA3 50LFA4 50LFA5S 50LFA5 50LFA6XL 50LFA7 50LFA8
Number of elements 3 4 5 5 6 7 8
Gain [dBi] 8,63 9,36 10,78 10,61 12,33 12,89 14,10
F/B [db] 20,79 23,46 26,49 24,83 22,6 32,89 28,95
SWR ≤ 1,04
Impedance 50Ω
Capacity [W] 5000
Length of boom [m] 1,95 3,00 3,95 4,48 7,30 9,40 12,58
Turn radius [m] 1,40 1,55 2,49 2,30 3,70 4,75 6,95
Wind speed [km/h] ≤200 ≤160 130
Fore-mast Mounting No
Connector Screws
Weight [kg] 3,0 4,0 4,9 5,4 9,0 9,5 17,0
Order No. 17740.6-3 17740.6-4 17740.6-5S 17740.6-5 17740.6-6XL 17740.6-7 17740.6-8
  139.00  176.00  209.00  209.00  352.00  418.00  555.00 

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