Wide-band version ... a "unconditionally stable" yet high G/T Yagi that shows least
degradation with wet elements or snow on and thus easy to reproduce parameters.
If you are looking for a Yagi suitable for worst weather condx ... this one might be it.

This medium length Yagi is anchored around 50.2 MHz to produce guaranted G/T at a moderate
T_ant from 50.0 to 50.5 MHz. The bent DE (K6STI style) transforms from low impedance to 50 ohms
at feed point for direct feed.

The wet weather stability or vice versa tolerance according slightly wrong BC numbers or element diameters
of this design will be among the best according to what Владимир UR5EAZ figured out for the 144 MHz
version of this 7 ele. GTV.

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Modified to own gusto GTV 50-8w built by Bob, ZL1RS

For further info check Bob's website on www.qsl.net

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Performance Data

                   Elem. 5/8 in + 16 mm
Gain vs. isotr. Rad.  13.4 dBi
Gain vs. Dipole       11.2 dBD
-3 dB E-plane         40.8 deg.
-3 dB H-plane         46.6 deg.
F/B                  -28.0 dB
F/R                  -22.5 dB
Impedance               50 ohms
VSWR Band Width     1.22:1 *
Mechan. Length       10620 mm
Electr. Length        1.78 λ

Stacking Dist. h-pol.
top-to-bottom         7.56 m = 24.79 ft
side-by-side          8.58 m = 28.13 ft

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

Element and Driver diameter is 5/8 inch or 16 mm throughout.
Use EZNEC's Auto-Segmentation at 135 MHz.

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Pattern and VSWR Plots

Elevation and Azimuth plot at 50.15 MHz

 

RL and SWR plot - simulated / 50.0 - 51.0 MHz

Gain, F/B and F/R plot - simulated / 50.0 - 51.0 MHz

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Downloads

EZNEC file of this Yagi  


STACKING info will follow shortly





73, Hartmut, DG7YBN