Performance Data and Geometry
Pattern and VSWR
Download as File
Stacking
GTV 23-14w Yagi with bent Driven Element
A 0.94 m long 23 cm Yagi that provides a very clean pattern and 16.2 dBi of gain.
This is the scaled and adapted version of the 2 m band GTV 2-14w. Design date of issue: 2023.03.06
GTV 23-23m 3D pattern plot at 1296.2 MHz
Performance Data
Specs: with 3.2 mm elements @ 1296.2 MHz
Gain vs. isotr. Rad. 16.2 dBi
Gain vs. Dipole 14.0 dBD
-3 dB E-plane 29.8 deg.
-3 dB H-plane 32.5 deg.
F/B -32.5 dB
F/R -26.9 dB
Impedance 50 ohms
VSWR Band Width 1.05:1*
Mechan. Length 920 mm plus 2 x 50 mm offset
Electr. Length 7.55 λ
Stacking Dist. h-pol. (1296.2 MHz)
top-to-bottom 0.415 m or 1.39 ft
side-by-side 0.450 m or 1.48 ft
*) at 1300.0 MHz
How many VHF operators have been looking up this design since Oct. 2023?
Geometry
This Yagi with 3.2 mm elements (aluminium welding rods) electrically insulated through 15 x 15 mm boom,
positions for formast mounting
Boom shape: square
Boom dim: 15 x 15 mm
Wall thickn.: 1.0 mm
Holes in boom: 5.2 mm
Offset rear: 400 mm
Offset front: 40 mm
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"Ready to saw and drill" data for mounting elements through this boom:
The Drivers diameter is 3.2 mm but should be made 5.0 mm and trimmed down to fitting length.
The insulators must have a fitting diameter for press fit in a 5.2 mm hole, insulator length is 7 mm, do not alter either dimension without consulting me.
The EZNEC model is done with Auto-Segmentation at 1296.2 MHz
This Yagi with 4.0 mm elements (aluminium welding rods) pressed electrically conductive through a 15 x 15 mm boom,
positions for formast mounting
Boom shape: square
Boom dim: 15 x 15 mm
Offset rear: 400 mm
Offset front: 40 mm
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"Ready to saw and drill" data for mounting elements through this boom:
Please note: This table holds the Boom Correction of 11.0 mm per DJ9BV as in his article "DL6WU Yagis for 23cm", Dubus 2/1994.
I have not tested this.
Pattern and VSWR Plots
Elevation and Azimuth plot at 1296.2 MHz
Return Loss and VSWR plots - simulated
Downloads
None so far.
Stacking
Stacking Dist. DL6WU Formula (144.3 MHz)
E-plane 0.415 m or 1.39 ft
H-plane 0.450 m or 1.48 ft
4 x GTV 23-14w in H-config. at distances per DL6WU:
4 x GTV 23-14w vertical at 400 mm each:
73, Hartmut, DG7YBN