Performance Data and Geometry
Pattern and VSWR
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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 build by BD5HSV
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
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
Elements 12 mm in free space:
Dipole tapered: 12 mm mid piece and 10 mm arms, elements 10 mm in free space:
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.).
Pattern and VSWR Plots
Elevation and Azimuth plot at 50.1 MHz
RL and SWR plot - simulated / 49.0 - 51.0 MHz
EZNEC file of this Yagi with 12 mm elements
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