DG7YBN / 1296 MHz / GTV 23-25m
  Last Update Mar. 28th, 2021




.......




Performance Data and Geometry
Pattern and VSWR
Download as File


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




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 15 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


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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

PLEASE NOTE THAT THE FOLLOWING DATA ARE UNTESTED!

This table is engineered with care but in case you decide to build this Yagi
be prepaired to not get a fully working on 1296.2 MHz Yagi!


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










Downloads

None so far.








73, Hartmut, DG7YBN



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