Elite Class Dual Band 2m-70cm Yagi Antenna Two Connectors 2m70DX57-2Conn

499,00 

Best of the best 2m-70cm 57 element dual-band antenna 2m70DX57-2Conn

Exceptional gain on both 144 and 432 MHz for super weak contest or EME signals. 17 elements on 2 meter and 40 elements on 70cm band on 12 meter boom. Ultimate design with full 3D Electromagnetic Simulation Software. 

 

Antennas-Amplifiers Product Benefits. A Major advance in Amateur Radio antenna design.

 

  • F/B and G/T superiority.
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.

 

  • Real gain antennas

Unlike other “manufacturers” who adds up to 1dB to the actual antenna gain, you will get the real maximum antenna gain from all our antennas.

 

  • No tuning antennas

Before dispatch, we assemble each and every antenna and test antenna characteristics. That means you may expect exceptionally good electrical and mechanical characteristics including low SWR across the designed range immediately after assembling.
No need to move dipole, 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 bands
  • Excellent mechanical properties
  • High durability, built without compromise

 

Why all above is very important? Why we do not use free wire programs like EZNEC (Pro), 4NEC2, MMANA-GAL or AO? Like all other producers or simulators do?

EZNEC, 4nec2 or AO producers or simulators puts on the web pages excellent “simulated” antenna patterns  produced by wire programs. Looks good on computer screen. But what about reality?

Elements are not infinitesimally thin.
Boom size is not 0 (zero) mm.
Boom corrections programs exists. But what about accuracy?
Electrical terminals from balun coaxial cable to dipole are probably at least 10 mm long what is not “simulated” 0 (zero) mm. It will lead to worsen SWR or when tuned to good SWR to sharp antenna resonance.
Real antennas are not in free space. They are surrounded by metal parts not calculated in any form by wire programs.

Errors made by poor programs like EZNEC (Pro), 4NEC2, MMANA-GAL, AO, etc. only for the above examples are unacceptable in these days. They will lead to wrong antenna gain and specially F/B. At least 5-15 dB lower than predicted. That mean if the antenna is “calculated” for F/B 30 dB it could be anywhere between 15dB to 25dB. Unfortunately that also mean antenna will have much worse G/T which will lead to bad contest results and poor EME reception. 

This has nothing to do with the obtained SWR of 1: 1 on antenna. SWR 1:1 is not related in any circumstances with antenna gain, F/B or G/T.

 

What 2m70DX57-2Conn mean?

2m band – 144-145 MHz with low SWR and exceptional gain and G/T.
70cm
band – frequency range 432 to 434 MHz with low SWR and super gain.
DX – Intended for use for DX hunting or catching super weak EME signals.
57 – 57 elements on antenna. 17 elements on 2 meter and 40 elements on 70cm band with extreme gain. Comparable with two monoband antennas on 12m boom.
2Conn – Each band has its own connector. You can connect transceiver like IC-9100 on both 2m and 70cm bands with two cables.

 

With less than 50 W with this 2m70DX57-2Conn dual band antenna you can work many EME stations.

 

Dipoles View on 2m70DX57-2Conn Two Band 2meter and 70cm Yagi Antenna.

2m70DX57-2Conn Dual Band Antenna High Power 1500W Dipole View

 

Electrical Specifications 2m70DX57-2Conn on 2meter band

Frequency Range: 144 – 145 MHz
Free Space Forward Gain: 17.4 dBi
Front to Back Ratio: 31 dB
3 dB Horizontal Beam width: 26.7°
Polarization: Horizontal
Nominal Input Impedance: 50 Ohms
SWR Across Entire Band: < 1.2
Maximum Power Input: 1500 W
Matching Method: Direct feed through common mode choke (current balun)
Connector: “N”
Coupling to 70cm: -40dB

 

2m70DX57-2Conn Super Gain 144MHz and 432MHz Dual Band Antenna 2meter Azimuth Radiation Pattern

 

Mechanical Specifications 2m70DX57-2Conn on 2m band

Number of Elements: 17
Element Diameter: 8 mm Aluminum tube
Dipole Diameter: 8 mm Hard Copper tube plastic coated
Longest Element: 1035 mm
Element Mounting Position: Below the boom
Balun and Connector: Included

 

Electrical Specifications 2m70DX57-2Conn on 70cm band

Frequency Range: 432 – 434 MHz
Free Space Forward Gain: 20.05 dBi
Front to Back Ratio: 36 dB
3 dB Horizontal Beam width: 15.6°
Polarization: Horizontal
Nominal Input Impedance: 50 Ohms
SWR Across Entire Band: < 1.2
Maximum Power Input: 850 W
Matching Method: Direct feed through common mode choke (current balun)
Connector: “N”
Coupling to 2m: -30dB

 

2m70DX57-2Conn Extreme Gain 144 MHz and 432 MHz Dual Band Antenna 70cm Azimuth Radiation Pattern

 

Mechanical Specifications 2m70DX57-2Conn on 70 cm band

Number of Elements: 40
Element Diameter: 4 mm Aluminum rod
Dipole Diameter: 8 mm Hard Copper tube plastic coated
Longest Element: 340 mm
Element Mounting Position: Above the boom
Balun and Connector: Included 

 

2m70DX57-2Conn 144MHz and 432MHz Dual-Band Antenna on 12m Boom Appearance

2m70DX57-2Conn Extreme Gain 144 MHz and 432 MHz Dual Band Antenna on 12m Boom Appearance

 

Common Mechanical Specifications

Boom Length: 11.52 m
Overall number of elements: 57
Boom Size: Tapered Boom 20x20mm, 30x30mm, 40x40mm different wall thickness
Number of Boom Pieces: 8
Guy Rope Support: Yes, Included. Four ropes
Mounting Mast Diameter:43 – 70 mm 1-11/16″ – 2-3/4″ OD
Survival Wind Speed: 150 km/h
Transportation Length: 1.82 m
Net Weight: kg
Gross Weight: kg

 

2m70DX57-2Conn Dual Band 2 meter and 70cm Yagi Antenna on 12meter Boom For EME and DX Hunting. Double guy rope support and bracket view.

2m70DX57-2Conn Dual Band Antenna Double Guy Rope Support View on 12meter Boom

 

2m70DX57-2Conn Dual-Band Antenna 17 elements on 2 meter and 40 elements on 70cm 12m Boom.

2m70DX57-2Conn DualBand Antenna 17 elements on 2 meter and 40 elements on 70cm 12m Boom

Additional information

Weight 17 kg
Dimensions 182 × 19 × 18 cm

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