DG7YBN - GTV 23-34w

Performance Data and Geometry

Pattern and VSWR

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GTV 23-34w 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 YBN 70-25m. Design date of issue: 2020.12.29

ZS6JON built GTV 23-34w at ZS6CR ... above a GTV 2-8w

ZS6JON built GTV 23-34w at Ronald, ZS6RVC

GTV 23-34w trimming test in ZS6JON's garden:

GTV23-34w Driver Cell (ZS6JON). Blade Dipole from brass fitted into slotted ⌀ 5 mm mid section pieces.

GTV 23-34w 3D pattern plot at 1296.2 MHz

Performance Data

Specs: with 3.2 mm elements @ 1296.2 MHz


Gain vs. isotr. Rad.  20.3 dBi
Gain vs. Dipole       18.1 dBD
-3 dB E-plane         19.6 deg.
-3 dB H-plane         20.0 deg.
F/B                  -39.6 dB
F/R                  -33.5 dB
Impedance               50 ohms
VSWR Band Width       1.05:1 *
Mechan. Length        2818.5 mm plus 2 x 70 mm offset
Electr. Length        12.2 λ

Stacking Dist. h-pol. (1296.2 MHz)
top-to-bottom         0.66 m or 2.19 ft
side-by-side          0.68 m or 2.23 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

Ele. 3.2 mm
DE 4.0 mm
Boom 7.5 x 7.5 mm ABS Plastic

Ele. fastening &. photo acc. F4FEY

"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

"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

GTV23-34w plot 1150-1350 MHz by ZS6JON: Return Loss (dB)

GTV23-34w plot 1150-1350 MHz by ZS6JON: VSWR

GTV23-34w plot 1150-1350 MHz by ZS6JON: Smith Chart

Downloads

None so far.

73, Hartmut, DG7YBN