DG7YBN / 144 MHz / GTV 2-12m
  Last Update Jan. 10th 2013
 


 .......



Performance Data and Geometry
Pattern and VSWR
Download as File
Stacking


GTV 2-12m Yagi with bent bent Driven Element

EME + SSB band version         ... link to new mark 2 design

This Yagi has very low back lobes for its length. It may serve as single antenna for Tropo, MS or even EME
or make quiet contest antenna due to its high F/B. The bent DE (K6STI style) transforms from approx. 17 ohms to 50 ohms at feed point.




Performance Data
 

Gain vs. isotr. Rad.  15.6 dBi
Gain vs. Dipole       13.5 dBD
-3 dB H-plane         31.2 deg.
-3 dB E-plane         33.4 deg.
F/B                  -30.8 dB
F/R                  -26.2 dB
Impedance               50 ohms
Mechan. Length        6720 mm
Electr. Length        3.23 λ

Stacking Dist. h-pol.    DL6WU     max. G/T
top-to-bottom           3.62 m      3.83 m
side-by-side            3.87 m      3.99 m
Geometry
 

        Pos.    1/2 Length  1/2 Length
                  in NEC      in NEC
				 
Refl.     0       5xx.0       510.0
DE(b)   220      100-4xx     100-487
DE(a)   274       0-100       0-100
D1      404       4xx.5       480.25
D2      692       4xx.0       473.7
D3     1238.2     4xx.0       461.5
D4     1875.7     4xx.0       454.0
D5     2618.7     4xx.0       449.25
D6     3403.8     4xx.0       444.5
D7     4237.8     4xx.0       438.25
D8     5100.5     4xx.0       438.25
D9     5938.7     4xx.0       429.5
D10    6720       4xx.0       424.0
                ele. 1/4"   ele. 8 mm
				
Note: element lengths for Ø 8 mm fit 5/16" too

The Drivers diameter is 10 mm for all examples.
Use EZNEC's Auto-Segmentation at 350 MHz.






Pattern and VSWR Plots

Current distribution

Elevation and Azimuth plot at 144.1 MHz

 


SWR and Return Loss plots - simulated with 4nec2









Downloads

EZNEC file of this Yagi  







Stacking 



Stacking Dist.    DL6WU Formula    max. G/T
H-plane               3.62 m        3.83 m
E-plane               3.87 m        3.99 m

Elevation plot and data of 4 Yagi bay using DL6WU stacking distances 


Gain vs. isotr. Rad.  21.56 dBi
Gain vs. Dipole       19.41 dBD
-3 dB H-plane         14.0 deg.
-3 dB E-plane         15.0 deg.
F/B                  -34.0 dB
F/R                  -26.2 dB
T_ant                229.1 K*
G/T                  -2.04 dB*
Theoretical numbers, no phasing line losses
nor imperfections caused by H-frame included
*) T_sky = 200 K, T_earth = 1000 K as in VE7BQH G/T table
Elevation plot and data of 4 Yagi bay using distances for max. G/T 


Gain vs. isotr. Rad.  21.62 dBi
Gain vs. Dipole       19.47 dBD
-3 dB H-plane         13.8 deg.
-3 dB E-plane         14.4 deg.
F/B                  -33.0 dB
F/R                  -26.2 dB
T_ant                231.0 K*
G/T                  -2.02 dB*
Theoretical numbers, no phasing line losses
nor imperfections caused by H-frame included
*) T_sky = 200 K, T_earth = 1000 K as in VE7BQH G/T table




73, Hartmut, DG7YBN


Flag Counter