
Performance Data and Geometry

Pattern and VSWR

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GTV 23-25m Yagi with bent Driven Element
A long 23 cm Yagi that provides a very clean pattern and almost 19 dBi of gain.
This is the scaled version of the 70 cm band GTV 70-25m. Design date of issue: 2020.12.29


GTV23-25m by ZS6JON under trimming and testing for best Return Loss (click to image to enlarge):
GTV 23-25m 3D pattern plot at 1296.2 MHz

Performance Data
Specs: with 3.2 mm elements @ 1296.2 MHz
Gain vs. isotr. Rad. 19.0 dBi
Gain vs. Dipole 16.8 dBD
-3 dB E-plane 22.2 deg.
-3 dB H-plane 22.8 deg.
F/B -37.7 dB
F/R -32.5 dB
Impedance 50 ohms
VSWR Band Width 1.05:1 *
Mechan. Length 1940.1 mm plus 2 x 70 mm offset
Electr. Length 8.39 λ
Stacking Dist. h-pol. (1296.2 MHz)
top-to-bottom 0.585 m or 1.92 ft
side-by-side 0.601 m or 1.97 ft
*) at 1300.0 MHz
How many VHF operators have been looking up this design since Dec. 2020?

Geometry
This Yagi with 3.2 mm elements
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Ele. 3.2 mm
DE 4.0 mm
Boom 7.5 x 7.5 mm ABS Plastic
Ele. fastening &. photo acc. F4FEY
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"Ready to saw and drill" data for mounting elements through this plastic boom:
Coming soon ...
The Drivers diameter is 4 mm.
The EZNEC model is done with Auto-Segmentation at 1296.2 MHz
This Yagi with 3/16 inch = 4.763 mm elements
Boom shape: square
Boom dim: 5/8 x 5/8 inch
Wall thickn.: 1.6 mm
Holes in boom: 7.5 mm
Offset rear: 70 mm
Offset front: 70 mm
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"Ready to saw and drill" data for mounting elements through this plastic boom:

The Drivers diameter is 4.763 mm.
The EZNEC model is done with Auto-Segmentation at 1296.2 MHz

Pattern and VSWR Plots
Elevation and Azimuth plot at 1296.2 MHz

Return Loss and SWR plots - simulated

Return Loss and SWR plots, same span 1150-1350 MHz as plotted - simulated

GTV23-25m plot 1150-1350 MHz by ZS6JON: Return Loss (dB)

GTV23-25m plot 1150-1350 MHz by ZS6JON: VSWR

GTV23-25m plot 1150-1350 MHz by ZS6JON: Smith Chart


Downloads
None so far.

73, Hartmut, DG7YBN