DG7YBN / 432 MHz / GTV 70-46w
  Last Update Jan. 1st 2018


Performance Data and Geometry
Pattern and VSWR
Mounting to Mast Suggestion
Stacking & Antenna G/T

GTV 70-46w Yagi   with bent Driven Element

EME band segment to 438 MHz very long Yagi

Bred as a very low noise Yagi it shows a typically clean pattern for its length.
The bent dipole is K6STI style as with all GTV designs

This design more or less is just a case study:

I wanted to see if I come near the
"PA432-43-12 World Best 432 MHz Antenna G/T  /  World Best G/T Super Yagi"
on same boom length and element diameter.

The GTV 70-46w is not fully developed. I stopped at the point were I found
a higher G/T and lower Antenna Temperature to that 43 element 12 m boom Yagi.
Hence there will be no support for how to build this Yagi at the moment.

Currently I seek to calm this annoying second side lobe ...

Antenna View and Current Profile

Performance Data

Specs: with 8 mm elements @ 432.1 MHz

Gain vs. isotr. Rad.  21.7 dBi
Gain vs. Dipole       19.6 dBD
-3 dB E-plane         16.8 deg.
-3 dB H-plane         17.2 deg.
F/B                  -40.3 dB
F/R                  -36.5 dB
Impedance               50 ohms
Mechan. Length        12030 mm incl. 2 x 30 mm boom ends offset
Electr. Length        17.25 λ

Stacking Dist. h-pol.
top-to-bottom         2.320 m
side-by-side          2.375 m

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Elevation and Azimuth Plot

Return Loss and VSWR

Serving Suggestion

It is understood that it is vital for such a long beam of rather limited thickness
that we support it with a 3 dimensional stucture. Which might be produced by
the combination of a strut and two v-shape guy wires to front and back. With sufficent
stiffness to prevent the whole thing from shaking in wind gales which animate it to
vibrate in 1st or 3rd natural mode.

4 Yagi bay at Stacking Distances per DL6WU (2375 x 2320 mm) strictly for now.

Radiation Pattern Simulations

Antenna Temperature and G/T; Average Gain for the lossless Yagi model is 1.001

Plots generated with 4nec2's 3D Viewer

73, Hartmut, DG7YBN

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