70 MHz 4m 3 Elements Yagi Antenna 4m3DX Antennas Amplifiers

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The best performance antenna in the class length of 1m. Direct 50 Ohm feed. Designed for portable use as well as stationary antenna. All screw, nuts and bolts stainless steel. Antenna is pre-tuned, so no need to move, cut or use rasp file for any element to get perfect SWR on intended frequency range. A short boom, wide-band 3 element antenna cover the entire band with SWR <1.2 from 70 MHz to 70.5 MHz.

Everything is included in the antenna box: Antenna, balun with connector and bracket. 70 MHz Ham Radio Yagi is perfect for field days since its very easy to assemble. 15 minutes is sufficient. All antenna parts are labeled, so it is extreme easy to assemble. Just put number to number.

Elements are tapered to reduce vibrations at high winds. Boom is just 1 meter long. Since this Ham Radio antenna has 3 elements it very easy to set up. Antenna is very good for field day since it is light-weight or permanent setup since antenna is very sturdy. Starting element diameter is 12 mm, middle part 10mm and 8mm ends. Tapered elements will reduce the wind-load. This Ham Radio antenna has wide azimuth radiation pattern. 70 MHz 3 element is good for vertical stacking in permanent setup since this wide angle allows listening to Ham Radio stations without frequent rotator movement.

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

4m3DX 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.

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

4m3DX Ham Radio antenna appearance:

4m 70MHz 3el Yagi Antenna for Portable Use -PA70-3-1A

Electrical and Mechanical specifications of 4m3DX antenna.

Electrical specifications of 4 meter 3 element Yagi:

Electrical Specifcations	4m3DX Antenna
Frequency Range:	70 – 70.5 MHz
Free Space Forward Gain:	6.9 dBi
Front to Back Ratio:	20 dB
3 dB Horizontal Beam-width:	67°
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 3 element antenna:

Mechanical Specifications	4m3DX
Number of Elements:	3
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 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:	1.25 kg
Gross Weight:	2.1 kg
Transportation Length:	1.2 meter

Former PA70-3-1A reference.

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