Performance Data and Geometry
Pattern and VSWR
Download as File
Stacking


GTV 50-3w Yagi   with bent split dipole

Wide-band version ... a wide band Yagi with relatively high F/B for its length.
It will make a nice 2 x vertical stack, small enough for many masts to fit in and with
respectably increased F/B and F/R at the recommended close stacking distance.

This is the 'big brother' of the so far tiniest Yagi that made it to the moon and back,
the 70 cm band GTV 70-3w that did a number of successful EME QSO's with just 60 W at
the feed. Actually not concipated as a 'high gainer' but focused on reproducablity and to deliver in all
weather and environmental circumstances. From the record of the 70 cm Yagi we can deduce it will
deliver as a compact six meter array.



A GTV50-3w at BA6KC

For chinese customers in China this Yagi is available at Xiaoshan Amateur Radio Club: www.by5hb.com


A GTV50-3w build by BD5HSV

BD5HSV reports:
VSWR 1: 1.0 at 50.1 MHz
VSWR 1: 1.2 at 52.5 MHz
VSWR 1: 1.5 at 53.0 MHz


A GTV50-3w build by the modest Thomas, M0ABA

and it works, here is a short Youtube Video by M0ABA receiving E74DO while
calling CQ on 50.090 MHz in a distance of around 1500 k or 900 miles


Performance Data

                   Elem. 12 mm
Gain vs. isotr. Rad.   7.3 dBi
Gain vs. Dipole        5.1 dBD
-3 dB E-plane         67.6 deg.
-3 dB H-plane        115.4 deg.
F/B                  -16.4 dB
F/R                   -9.0 dB
Impedance               50 ohms
VSWR Band Width     1.08:1 *
Mechan. Length        1730 mm + boom offsets
Electr. Length        0.29 λ

Stacking Dist. h-pol.
top-to-bottom         3.90 m = 12.8 ft
side-by-side          x.xx m = xx.x ft

*) as in VE7BQH G/T table = at 50.50 MHz

Geometry

Elements 12 mm in free space:

Dipole tapered: 12 mm mid piece and 10 mm arms, elements 10 mm in free space:

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This Yagi with 12 mm elements on a 25 x 25 mm boom with standard insulators
This table also serves booms 1 x 1 inch and elements 1/2 inch (1 mm less length approx.).

Ele. 12.0 mm DE 12 mm Boom 25 x 25 mm

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Pattern and VSWR Plots

Elevation and Azimuth plot at 50.1 MHz

 

RL and SWR plot - simulated / 49.0 - 51.0 MHz

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Downloads

EZNEC file of this Yagi with 12 mm elements           

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Stacking

Elevation plot of a 3 over 3 at 50.1 MHz using own stacking distances

Stacking Dist.    DL6WU Formula
H-plane               3.90 m
E-plane               x.xx m

Gain vs. isotr. Rad.  10.8 dBi
Gain vs. Dipole        8.7 dBD
-3 dB H-plane         56.0 deg.
-3 dB E-plane         33.0 deg.
F/B                  -31.7 dB
F/R                  -21.1 dB

73, Hartmut, DG7YBN