70 MHz 4m 4 element Portable Antenna 4m4DX 70MHz Antennas Amplifiers

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Low Noise High Gain PA70-4-1.5 will Ham Radio Yagi provides stunning performance across the 4 meter band: 70 – 70.5 MHz. Antenna has been calculated with the latest full 3D Electromagnetic Simulation Software, with included the influence of the boom, brackets and connectors. Performances of such way designed antenna are extraordinary better than antennas “designed” with just wire programs that can’t calculate influence of any metallic structure near the antenna elements.

Calculating with full 3D EM Software gives opportunity for uncompromised performance. Much better than any other world competition. High gain, heavy suppression of all side lobes. Solid construction that can withstand strong gusts of wind of more than 160 km/h! All screw, nuts and bolts are stainless steel.

Antennas Amplifiers (AA) equipment is available in backorder only, and will be shipped within 10 to 15 days after the order.

More details

Data sheet

4m4DX is pre tuned antenna.

Before dispatch, we assemble each and every antenna and test antenna characteristics. That means you can expect all the 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.

Power options:

Antenna does not have power limit, only limitations are in used balun and antenna connector. Default maximum power input is 850 W.

Antenna Power Rating does not affect electrical or mechanical characteristics of the antenna. PA70-4-1.5B, PA70-4-1.5BP, PA70-4-1.5BE, PA70-4-1.5BEX have the same characteristics, only difference is in antenna maximum input power.

Electrical specifications of 4 meter 4 element Yagi:

Electrical Specifcations	4m4DX Antenna
Frequency Range:	70 – 70.5 MHz
Free Space Forward Gain:	8.2 dBi
Front to Back Ratio:	27 dB
3 dB Horizontal Beam-width:	60.6°
Polarization:	Horizontal
Nominal Input Impedance:	50 Ohm
SWR Across Entire Band:	< 1.2
Maximum Power Input:	850 W (or more by request)
Matching Method:	Direct feed through common mode choke (current balun)
Connector:	“N” default (SO 239 or 7/16 DIN by request)

Mechanical specifications of 70 MHz 4 element antenna:

Mechanical Specifications	4m4DX
Number of Elements:	4
Elements Diameter:	12 mm, extensions 10 mm
Dipole Diameter:	12 mm, extensions 10 mm
Longest Element:	2.2 meter
Element Mounting Position:	Below the boom
Balun and Connector:	Included
Boom Length:	1.46 meter
Boom Size:	20 x 20 mm
Turning Radius:	1.25 meter
Number of Boom Pieces:	1
Guy rope support:	Not necessary. Strong boom.
Mounting Mast Diameter:	30 – 50 mm 1-1/4 – 2″ OD
Clamp:	M6 Stainless Steel
Survival Wind Speed:	160 km/h
Wind Load:	–
Net Weight:	1.6 kg
Gross Weight:	2.6 kg
Transportation Length:	1.49 meter

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