-
• Main Page
- • Home
• Antennas - • 144 MHz
- Straight Dipole
144 MHz YagisYBN 2-9m: 4.5 m moderate band width, low Antenna Temperature, good willing 50 ohms direct feed Yagi - a straight DE version twin to the GTV 2-9m
Elevation Plot
- GTV 2-2mA 50 ohms direct feed 2 ele. Yagi with bent DE and potential as broad beam Contest Stack.
It can be used as back-to-back stack:
- GTV 2-4w1.0 m 144-146 MHz wide band width version of the Low Noise Yagi with bent DE as useful for satellite operation as for contesting thanks to high F/B and small volume of rear quadrants lobs in general.
Elevation Plot at 144.1 MHz
- GTV 2-5m1.6 m moderate to wide band width version of the Low Noise Yagi with bent DE as useful for satellite operation as for contesting thanks to high F/B and small volume of rear quadrants lobs in general.
Elevation Plot
- GTV 2-6m2.4 m moderate band width version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- GTV 2-7w2.7 m wide band width version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- GTV 2-7n3.1 m narrow band, max. G/T version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- GTV 2-8w3.7 m wide-band, still good G/T and nice F/B version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- GTV 2-8n3.8 m narrow band, max. G/T version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- GTV 2-9n4.3 m narrow band, balanced between low Antenna Temp. and G/T version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- GTV 2-9m4.5 m moderate band width, low Antenna Temp. version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- GTV 2-10LT5.1 m moderate band width, lowest Antenna Temp. version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- GTV 2-11LT6.0 m moderate band width, lowest Antenna Temp. version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- GTV 2-12m mk2Improved 6.8 m version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot:
- GTV 2-12n6.8 m narrow band version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot:
- GTV 2-13m7.5 m version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot:
- GTV 2-14w8.4 m version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- GTV 2-16w10 m version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- GTV 2-18w11.7 m version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- GTV 2-19m12.4 m version of the low impedance, yet 50 ohms direct feed Low Noise Yagi with bent DE introduced in Dubus 1/2013
Elevation Plot
- Straight Dipole
Performance Data and Geometry Pattern and VSWRGTV 2-19m Yagi with bent Driven Element
EME + SSB serious full size Long Yagi (12.4 m boom)
Serves as single Yagi for EME even with modest output power. Can be used up to FM range of band.
The pattern with all rear lobes down to approximately -30 dB makes it a very useful contest antenna.
The bent DE (K6STI style) transforms from low impedance to 50 ohms at feed point for direct feed.
Performance Data
Gain vs. isotr. Rad. 17.8 dBi Gain vs. Dipole 15.6 dBD -3 dB E-plane 25.0 deg. -3 dB H-plane 26.2 deg. F/B -31.8 dB F/R -29.5 dB Impedance 50 ohms VSWR Band Width 1.26:1 * Mechan. Length 12342 mm Electr. Length 5.93 λ Stacking Dist. h-pol. top-to-bottom 4.59 m or 15.1 ft side-by-side 4.81 m or 15.8 ft *) as in VE7BQH G/T table = at 145.00 MHz
Geometry
Pos. Full Length
Free Space
incl. SBC
Refl. 0.0 1012.3
DE(b) 264.0 970.3
DE(a) 314.0 0-100
D1 459.0 962.3
D2 737.5 953.3
D3 1283.5 924.3
D4 1922.0 910.3
D5 2663.0 899.3
D6 3454.5 893.3
D7 4274.5 881.3
D8 5118.5 871.3
D9 5973.0 867.3
D10 6808.5 861.3
D11 7631.5 858.3
D12 8450.0 857.3
D13 9236.0 852.3
D14 10027.5 850.3
D15 10819.0 844.3
D16 11643.5 835.3
D17 12342.0 822.3
ele. 8 mm
SegmentationBC = +2.3 mm = (144.6 MHz - 144.2 MHz) * 5.85 mm/MHz
Note: element lengths for Ø 8 mm fit 5/16" too
The Drivers diameter is 12 mm for all examples.
Use EZNEC's Auto-Segmentation at 380 MHz.
Sketch of Bent Dipole
Pattern Plots
Azimuth plot at 144.1 MHz
SWR plots - simulated
144.0 - 145.0 MHz
144.0 - 146.0 MHz
73, Hartmut, DG7YBN