DG7YBN / 50 MHz / GTV 50-8w
  Last Update July 27th 2013




.......



Performance Data and Geometry
Pattern and VSWR
Download as File
Stacking


GTV 50-8w Yagi   with bent Driven Element

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.




Performance Data

                   Elem. 5/8 in + 16 mm
Gain vs. isotr. Rad.  13.4 dBi
Gain vs. Dipole       11.2 dBD
-3 dB H-plane         40.8 deg.
-3 dB E-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


Geometry



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








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










Downloads

EZNEC file of this Yagi  


STACKING info will follow shortly





73, Hartmut, DG7YBN