DG7YBN / 144 MHz / GTV 2-19m
  Last Update Jan. 2th 2016




.......



Performance Data and Geometry
Pattern and VSWR


GTV 2-19m Yagi   with bent Driven Element

EME + SSB serious full size Long Yagi (12.4 m boom)

Serves as single Yagi for EME even with modest output power. Can be used up to FM range of band.
The pattern with all rear lobes down to approximately -30 dB makes it a very useful contest antenna.
The bent DE (K6STI style) transforms from low impedance to 50 ohms at feed point for direct feed.





Performance Data

Gain vs. isotr. Rad.  17.8 dBi
Gain vs. Dipole       15.6 dBD
-3 dB H-plane         25.0 deg.
-3 dB E-plane         26.2 deg.
F/B                  -31.8 dB
F/R                  -29.5 dB
Impedance               50 ohms
VSWR Band Width     1.26:1 *
Mechan. Length       12342 mm
Electr. Length        5.93 λ

Stacking Dist. h-pol.
top-to-bottom         4.59 m or 15.1 ft
side-by-side          4.81 m or 15.8 ft

*) as in VE7BQH G/T table = at 145.00 MHz



Geometry

Note: bent dipoles diameter is 12 mm

                            
        Pos.    Full Length
                Free Space
                 incl. SBC
				 
Refl.     0.0      1012.3
DE(b)   264.0       970.3
DE(a)   314.0       0-100
D1      459.0       962.3
D2      737.5       953.3
D3     1283.5       924.3
D4     1922.0       910.3 
D5     2663.0       899.3
D6     3454.5       893.3
D7     4274.5       881.3
D8     5118.5       871.3
D9     5973.0       867.3
D10    6808.5       861.3
D11    7631.5       858.3
D12    8450.0       857.3
D13    9236.0       852.3
D14   10027.5       850.3
D15   10819.0       844.3
D16   11643.5       835.3
D17   12342.0       822.3

                ele. 8 mm 
SegmentationBC = +2.3 mm = (144.6 MHz - 144.2 MHz) * 5.85 mm/MHz
Note: element lengths for Ø 8 mm fit 5/16" too

The Drivers diameter is 12 mm for all examples.
Use EZNEC's Auto-Segmentation at 380 MHz.

Sketch of Bent Dipole









Pattern Plots

Azimuth plot at 144.1 MHz

Elevation plot at 144.1 MHz


SWR plots - simulated

144.0 - 145.0 MHz



144.0 - 146.0 MHz









73, Hartmut, DG7YBN


Flag Counter