DG7YBN / 222 MHz / GTV 222-11w
  Last Update Jan. 12th 2020


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Performance Data and Geometry
Pattern and VSWR
Download as File
This Yagi with bent Folded Dipole
Stacking
Matching


GTV 222-11w Yagi   with bent Driven Element

Wideband OWA style medium size Yagi with focus on EME + SSB band but covering 222-226 MHz


This Yagi has very low back lobes for its length. It may serve as single antenna for portable
use and certainly make a useful 4 x vertical stack. It makes a 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.


Current distribution

3D Pattern







Performance Data

Specs: with 5/16 inch elements @ 222.1 MHz 

Gain vs. isotr. Rad.  14.9 dBi
Gain vs. Dipole       12.8 dBD
-3 dB E-plane         34.5 deg.
-3 dB H-plane         37.6 deg.
F/B                  -31.4 dB
F/R                  -26.9 dB
Impedance               50 ohms
Mechan. Length        3858 mm incl. 2 x 30 mm stand off
Electr. Length        2.81 λ

Stacking dist. h-pol.
top-to-bottom         2.28 m or 7.47 ft
side-by-side          2.09 m or 6.87 ft


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Pattern and VSWR Plots

Current distribution Elevation and Azimuth plot at 222.1 MHz

 


RL and SWR plot - simulated







Geometry



Sketch of bent dipole




Table 1: This Yagi with 5/16 inch elements on boom:

"Ready to saw and drill" data for mounting elements through boom with BC according SM5BSZ's BC.exe:
Note: with through Boom BC it is important to stick to the boom end offsets given below!

Ele. 5/16 in
DE 1/2 in or 12.7 mm
Boom 1 x 1 x 0.063 in


Note: This includes a "Segmentation Density Correction" (SBC) of 3.14 mm

Read abt. the SBC here .





Table 2: This Yagi with 4 mm elements through a 1 x 1 inch boom

Ele. 4.0 mm
DE 1/2 in or 12.7 mm
Boom 1 x 1 x 0.063 in


"Ready to saw and drill" data for mounting elements through boom with BC according SM5BSZ's BC.exe:
Note: with through Boom BC it is important to stick to the boom end offsets given below!

This table is only valid for:
Boom shape: square
Boom dim: 1 x 1 inch
Wall thickn.: 0.063 inch or 1.6 mm
Holes in boom: 6.0 mm
Offset rear: 30 mm
Offset front: 30 mm
  




This includes a "Segmentation Density Correction" (SBC) of 3.14 mm
for compensation of the insulators (7arrays.com ) as shown above in combination with SM5BSZ'S BC.exe values.

Note: with through Boom BC it is important to stick to the boom end offsets given below!








Downloads

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73, Hartmut, DG7YBN


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