40m 2 El HQ Traps Yagi(Eng)

Projecting this antenna has continued for 1 year. i made our antenna setup. I’ve had excellent results in my tests Yagi only 15kg. The longest wing has a total length of 14m and has a length of 5.5m boom.

As you will see in the article, you can work very well with 166 khz band width. This Bandwidth is calculated based on the lower / upper 1.5 swr values. The construction phase is full of details that need attention, and there is nothing to be done. You should use 1: 1 Balun. Also shunt coil may be required.

As with other projects, this project is my gift to Radio Amateur!
It may be published everywhere, but may not be reproduced commercially.

 

Band 40m
Gain(dbi) 13,1 / 12,0/ 11,5
 7 Mhz    7.000-7.200
Impedance 50
Element Piece 2
Maximum Element Lenght 13,56m
Boom Lenght 555cm
Band Width <1.5> swr 166 khz 
Weight(kg)  15kg (+/ – )

 

CONTRUCTION STAGES;

  • Dimensions. (For 1 wing.);

BAND A

D: 25 mm

S: 2 mm

B

D: 20 mm

S: 1,5 mm

C

D: 16 mm

 S:1,5 mm

D

D:12mm 

S: 1 mm

1 wing dimensions  
40m REF 250cm 62+62cm 130cm 178cm 678
40m DRV 250cm 62+62cm 130cm 159cm 659

 

  • Necessary Lengths for Cutting (+25cm addet.)

BAND A

D: 25 mm

S: 2 mm

B

D: 20 mm

S: 1,5 mm

C

D: 16 mm

 S:1,5 mm

D

D:12mm 

S: 1 mm

 
40m REF   500cm  85+60cm 155cm  203cm
40m DRV 250cm+250cm 85+60cm 155cm 185cm
Not; +25 cm Addet. should be cut according to these dimensions.  

 

  • Other Materials;
  • Clamps;

 

 

  • Cuting Lenght List;

The following cutting lengths are calculated to be the least wastage due to the fact that aluminum is sold at a length of 6m.

6063 Code

ALUMINUM

PEICE CUTING LENGHT
 

40X2,5mm BOOM

 

 

1 piece (6m)

 

 

600cm(Dont cut!)

 

25 X 2mm  2 Piece (6m) 250cm X 2 Piece

500cm X 1 piece= 10mt

20 X 1,5mm  1 piece (6m) 87+87+87+87+60+60+ 60+60 = 588cm
16 X 1,5mm  

 1 piece (6m)

 

150+150+150+150= 600cm
12X 1mm  2 piece (6m) 203+203+185+185

= 776cm

6cm Width

8mm Thinkness

LAMA 50cm X 1 piece = 30cm
40 X 40 X 40mm Bracket 30cm X 1 piece = 30cm

 

  • Driver Element Insulator, Hard Plastic or Fiber ;

According to the pipe. 25 cm in length and as shown in the picture should be left in the middle part of a set of 2.5cm.

 

  •   TRAPS;

These coils are air spaced. This improves performance. 14 cm Diameter 6mm Aluminum wire will be wrapped in 10 turns. Measure with L / C meter if you have . Must be 11uH.

Traps winding is one of the most critical elements of our Antenna. No error should be made. First of all, to keep the trap constant, 1.5cm width 20cm long plastic on the following photo as shown in the image 8mm diameter and 12 pieces of holes should be prepared. This process will be smoother if done on lathe.

6mm Thickness Aluminizing and outside the plastic coated cable as shown below are wrapped. 10 laps14cm in diameter (11uH). You can use 12cm diameter Waste water PVC Pipe for proper winding. i wrapped it this way. You can develop in different ways.

 

 

 

When the winding of the bobbins is finished, the wrapper should be tightened with plastic pullers.

 

  • i’m used a glass fiber rod; 30cm Lenght, 16mm thinkness. (Do not hold with bare hands.)

As you can see in the bottom picture, the idle ends of the aluminum forged must be corrected by pounding on the iron and two bolt holes must be opened.

With the two chrome screws, the coil side must be tightened with the hose clamp a second time. This way it will be stronger. At the very end this section will be closed with heat shrinking tubing with the purpose of isolation.

 

 

  • Pipe insertion method;

it should be noted in the screwing method. Aluminum pipes are drilled according to proper opening of the element chrome bolt hole opened up, but to go through the head of a screw on the top side of the aluminum supplied complete and tightly tightening. Otherwise it is not possible to make a complete and powerful compression. you need to use washers under the screw and relaxation for chromium to prevent corrosion.

it is necessary to use chrome screws to prevent corrosion. 3.5cm 4mm 24 Pcs, 2cm 4mm 8 Pcs.

 

      For the reflector L The bracket must be made as shown in the illustration and the holes must be drilled from the appropriate places. The bolts used must be at least 6mm. L Angle 4cm 4mm 30cm length.

 

  • 1: 1 Balun should be used. If you use Balun, you may need to do the Hairpin Match if you don’t have SWR 1: 1 or 1: 0. Also, it is a method of increasing the bandwidth.

 

  • Suspension of elements to increase Wind Resistance;

 The elements are long and need to be strengthened against the wind due to the coil weight. As you can see below, the support elements must be placed on the Boom and the coil should be hung from the starting points by the rope. The rope to be used must be from the market sold as a parachute rope and kevler rope. Because this rope can remain intact for many years without breaking.

60 cm long 2cmx4cm Box aluminum profile Clamp and 50cm 12mm Aluminum pipe were used to prevent the wings from hanging down.

 

This antenna has been designed by myself. I have to note that I’m not an engineer. I’ll be very happy if this project will be fulfilling the expectations of fellow Hams. This Project or any other Project of mine can be shared-as long as not being used for commercial purposes.  Sorry for my bad english!

 

73! TA7OM, Huda.

                              

 

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TA7OM, Huda.

 

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RL3QI – Vladimir Veremeenko

 

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