70cm Excellent Gain EME Yagi Antenna With 5.4 meter Boom 70cm42CROSS

42 elements on tapered boom from 20 mm to 40 mm size. Devoted for EME and DX hunting 432-434 MHz version. And 430-440 MHz version not just for EME and DXing but LEO Satellites. Part of “Super LEO“.

Exemplary good low noise characteristics with high suppression of all side lobes. With this antennas you will hear extreme weak signals via the Moon with ability to change polarization. Maximum polarization mismatch is -3dB with just one single H/V relay.

 

What 70cm42CROSS mean?

70cm band – Two versions 432-434 MHz and 430-440 MHz
42 Elements – 21 element for horizontal polarization and 21 element for vertical polarization
CROSS – Yagi antenna has both horizontal and vertical elements – separated on a single boom, the antenna is mounted in a “+” format.
Horizontal polarization – conventional mount horizontally polarized elements are parallel to Earth
Vertical polarization – as above but elements are perpendicular to Earth.

 

 

Electrical Specifications for 70cm42CROSS

Frequency Range: 432-434 (EME, DX version), 430-40MHz (Super LEO version)
Free Space Forward Gain: 18.2 dBi
Front to Back Ratio: 36 dB
Polarization: Horizontal and Vertical
Nominal Input Impedance: 50 Ohms
SWR Across Entire Band: < 1.2
Maximum Power Input: 2 x 850 W
Matching Method: Direct feed through common mode choke (current balun)
Connectors: 2 x “N”

 

Mechanical Specifications for 70cm42CROSS

Number of Elements: 42 (21+21 element)
Element Diameter: 4mm Aluminum rod
Dipole Diameter: 8 mm Hard Copper tube plastic coated. Hairpin match
Longest Element: 340 mm
Element Mounting Position: CROSS antenna – 2 Sides
Balun and Connectors: Included
Boom Length: 5.4 m
Boom Size: Tapered Boom 40×40 mm, 30×30 mm, 20×20 mm
Turning Radius: 3 m
Number of Boom Pieces: 5
Guy rope support: No, strong boom
Mounting Mast Diameter: 32 – 70 mm
Clamp: M8 Stainless Steel
Survival Wind Speed: 150 km/h
Wind Load: 0.19 m2
Net Weight: 6 kg
Gross Weight: 7.9 kg
Transportation Length: 1.2 m

 

Dipoles and balun view on 70cm42CROSS

 

Antennas-Amplifiers Product Benefits

No tuning antennas

Before dispatch, we assemble each and every antenna and test antenna characteristics. That means you can expect exceptionally good electrical and mechanical characteristics including low SWR across the designed range immediately after assembling.
No need to move, cut, tune or use rasp for any element to get perfect SWR on intended frequency range. Everything is pre tuned.

That lead also to another very important detail. When assemble and test each antenna is complete with all washers, nuts, bolts guy rope supports etc.
When packing all parts are already on antenna without possibilities to “forget” important parts to put in the box. So you will always receive complete antenna what we tested just before dispatching.

Designs that work well in all weather conditions
Low SWR and superior G/T, F/B and F/S ratios across the entire band
Excellent mechanical properties
High durability, built without compromise

 

70cm CROSS Yagi Antenna 70cm42CROSS Azimuth Radiation Pattern

 

 

A Major advance in Amateur Radio antenna design.

All antennas have been calculated using state of the art full 3D Electromagnetic Simulation software including the influence of the boom, bracket, baluns and connectors.

The performance of antennas designed using these techniques are exceptional, far better than antennas designed using “wire” programs like EZNEC Pro/4 –NEC v5.0, 4NEC2, MMANA or AO
These programs cannot calculate the effect of any metallic or dielectric structures near the antenna elements and therefore must be considered inaccurate.

Designs are optimized using the Particle Swarm algorithm, which is considered one of the best antenna optimization algorithms available, followed by a classic Nelder-Mead Simplex algorithm for fine-tuning.

 

Ordered antennas are always complete

That means that you do not need to buy or add to order balun, connector or guy rope support.
Everything is included.

 

Designed to last.

 

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