Tropo – EME with stack of two or four antennas.
100 W will be enough to start work a lots of amateur around the world on two bands.
System with just two vertically stacked antennas (2.55m distance) could achieve about 17.35 dBi on 144 MHz and about 20.8 dBi on 432 MHz.
Save your space for another antennas.
PA144-432-34-6-2CBGPÂ 144 MHz and 432 MHz-Dual Band Antenna G/T on 144 MHz
PA144-432-34-6-2CBGPÂ 144 MHz and 432 MHz-Dual Band Antenna G/T on 432 MHz
DualBand Antenna PA144-432-34-6-2CBGP Measured VSWR 144 MHz  with calibrated HP8753ES Network Analyzer
DuoBand Antenna PA144-432-34-6-2CBGP Measured VSWR 432 MHz
| Electrical Specifications 2 m | |
| Frequency Range: | 144 – 145 MHz |
| Free Space Forward Gain: | 15 dBi |
| Front to Back Ratio: | 27 dB |
| 3 dB Horizontal Beamwidth: | 33.6 ° |
| G/T | -3.54 |
| Polarization: | Horizontal |
| Nominal Input Impedance: | 50 Ohms |
| SWR Across Entire Band: | < 1.2 |
| Maximum Power Input: | 1.5 kW |
| Matching Method: | Direct feed through common mode RG142 Teflon choke (current balun) |
| Connector: | “N” |
| Mechanical Specifications 2m | |
| Boom Length: | 5.84 m |
| Boom Size: | 40 x 40 mm different wall thickness |
| Number of Boom Pieces: | 3 – 4 |
| Element Diameter: | 8 mm Aluminum tube |
| Dipole Diameter: | 8 mm Hard Copper tube |
| Number of elements: | 11 |
| Longest element: | 1.03 m |
| Element Mounting Position: | Below the Boom |
| Guy rope support: | 10 x 20 x 620 mm Stainless Steel |
| Mounting Mast Diameter: | 1-1/4″ – 2-3/4″ 43 – 70 mm |
| Survival Wind Speed: | 150 km/h |
| Transportation Length: | 1.5 m or 2 m |
| Antenna Weight: | 9.5 kg |
| Electrical Specifications 70 cm | |
| Frequency Range: | 432 – 434 MHz |
| Free Space Forward Gain: | 17.8 dBi |
| Front to Back Ratio: | 27 dB |
| 3 dB Horizontal Beamwidth: | 22.8° |
| G/T | 5.28 |
| Polarization: | Horizontal |
| Nominal Input Impedance: | 50 Ohms |
| SWR Across Entire Band: | < 1.2 |
| Maximum Power Input: | 750 W |
| Matching Method: | Direct feed through common mode RG142 Teflon choke (current balun) |
| Connector: | “N” |
| Mechanical Specifications 70 cm | |
| Element Diameter: | 4 mm Aluminum rod |
| Dipole Diameter: | 8 mm Hard Copper tube |
| Number of elements: | 23 |
| Longest element: | 0.35 m |
| Element Mounting Position: | Above the Boom |
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