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- • 70 MHz
- YBN 4m-2wA 0.9 m 70 MHz 2 ele. with split Dipole for direct 50 ohms feed to be very uncritical for home building. A wideband version with hugh bandwidth.
A project for an afternoon ...
Antenna View
- YBN 4m-5mA 3.1 m 70 MHz 5 ele. derived from the 2 m 5 ele with split Dipole to be very uncritical for home building. A wideband version with hugh bandwidth and yet high F/B.
Elevation Plot
- YBN 4m-8mA 7.2 m 70 MHz 8 ele. derived from the 2 m 5-8 concepts 8 ele. with split Dipole to be very uncritical for home building. A wideband version with hugh bandwidth and yet high F/B.
Elevation Plot
- GTV 4m-5wA very directive 3.15 m 70 MHz low Antenna Temp. version of the low impedance, yet 50 ohms direct feed 144 MHz Low Noise Yagi introduced in Dubus 1/2013. Carefully tuned for some bandwidth and most F/B.
Elevation Plot
- GTV 4m-10LTA very directive 10.5 m 70 MHz low Antenna Temp. version of the low impedance, yet 50 ohms direct feed 144 MHz Low Noise Yagi introduced in Dubus 1/2013. A lowest Antenna Temperature version.
Elevation Plot
- YBN 4m-2w
- • 144 MHz
- • 432 MHz
Performance Data and Geometry Pattern and VSWR Download as FileGTV 4m-10LT with bent Driven Element
This Longyagi has a high F/B and altogether very little back lobe volume
The bent DE (K6STI style) transforms from low impedance to 50 ohms at feed point for direct feed.
The name "LT" reminds of the EF0210LT by YU7EF. This design here has slightly higher Antenna Temperature only
but more gain.
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Performance Data
Gain vs. isotr. Rad. 14.5 dBi Gain vs. Dipole 12.4 dBD -3 dB E-plane 36.0 deg. -3 dB H-plane 39.4 deg. F/B -28.1 dB F/R -26.0 dB Impedance 50 ohms Mechan. Length 10,402 mm Electr. Length 2.43 λGeometry
The Drivers diameter is 16 mm
Refl DE D1 D2 D3 D4 D5 D6 D7 D8
Pos. 0 585 863 1397 2406 3732 5362 7046 8769 10402
Ele. 2110 2044 1978 1962 1914 1882 1844 1832 1794 1756
Diam. 12 16 12 12 12 12 12 12 12 12
Difference between simulation using high segmentation as given above and low segmentation per "Auto Segmentation" at 70.15 MHz
makes a delta of 0.15 MHz. With 12.5 mm per MHz on 70 MHz we need to add 1.8 mm to the ele. lenghts in this table to compensate the SBC.
Now we add the common BC on top of that and build a Yagi that is on correct frequency.
Pattern and VSWR Plots
Elevation and Azimuth plot at 70.15 MHz
RL and SWR plot - simulated
Downloads
EZNEC file of this Yagi (12 mm ele.)
73, Hartmut, DG7YBN