DG7YBN / LTE / YBN 850 MHz 13 ele.
  Last Update June 17th 2016




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Performance Data and Geometry
Pattern and VSWR
Download as File


YBN 850-13 Yagi



LTE Low Noise Yagi covering 800 to 860 MHz LTE band

Emphasising a high directivity factor over an extraordinary bandwidth predestinates this design to boost the signal-to-noise level in difficult spots for reception or to manage a connect at all in rural places.

Judging this antenna by comparing forward gain against advertised other LTE Yagis may not tell the full story. We often find quite opimistic gain numbers for boom length and bandwidth produced by marketing strategists. Not only on the field of LTE antennas. However I believe the key to an impressive Signal-to-Noise ratio especially for a wideband application is a very clean pattern. As whatever interfering signal occurring on the bandwidth of the receiving frontend of the LTE unit can not be suppressed by filters. Which otherwise would block a part of the designated band. To judge the abilities of a directive LTE antenna it takes both, gain and pattern cleanness. As the pair defines the ratio of signal and amount of noise received with it, known as Antenna G/T. Find more read about Antenna Temperature to Gain here

Attention: This is a directive antenna with a relatively high forward gain. Please keep transmission power inside the allowed limits in accordance to your local Telecommunication Regulations. Here is a link to my EIRP-Online Calculator



YBN 850-13w with Digital TV antennas shown on the Hamradio 2015

 

YBN 850-13w with bent dipole (50 ohms)

 



Performance Data

Gain vs. isotr. Rad.  13.8 to 14.2 dBi
Gain vs. Dipole       11.7 to 12.1 dBD
-3 dB H-plane         37.6 deg.
-3 dB E-plane         42.0 deg.
F/B                  -24.2 to -28.3 dB
F/R                  -21.3 to -24.2 dB
Impedance               50 ohms
Mechan. Length         960 (1120)mm
Electr. Length        2.44 λ (840 MHz)
Weight appr.           410 gr. = 0.90 lbs

Stacking Dist. h-pol. (840 MHz)
top-to-bottom         0.50 m = 1.63 ft
side-by-side          0.55 m = 1.82 ft

Geometry



        Pos.    Full Length
                Free Space
				
Refl.     0        194.0
DE       76        175.0
D1       98        157.0
D2      154        155.0
D3      239        149.0
D4      357        145.0
D5      481        143.0
D6      615        140.0
D7      758        133.0
D8      890        130.0
 
                Ele. 4 mm
              Dipole 5 mm


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Pattern and VSWR Plots

Elevation and Azimuth plots from 820 to 860 MHz

Azim Plot at 840 MHz



Elev. Plots at 820, 840, 860 MHz



SWR plot - simulated










Downloads

EZNEC file of this Yagi (4 mm ele.)  








73, Hartmut, DG7YBN


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