Antenna project

 

Start
station of PD1AIQ
Antenna project
web link page
Old Pictures

 

From the day we live in our new house I have a discussion with the people next-door about setting up my antenna tower.
They do not want a tower next to there house but do not have a reason for it. When I started my antenna building project next to my house
the first thing they did was calling the local government to stop me building.

This became a long story during the fight with the people from the government to restart building activities.
Because of the complaining people next-door I did not get an license to build my tower on the place I want.
Now I had to find an other way to get my tower build up, and after discussion an discussion with the government finally I found a way to get it agreed. I had to make a sort of construction from steel mounted at my house where I could place the tower on. ( see pictures below )

This is allowed in the Netherlands because of a new law that says, a tower / construction that is mounted on the wall of a house and is not higher than 5 meters above the roof, you can place without a license. On this way the complaining people had no weapon to hit me anymore.
This was the only way to get my tower up.

And so I am finally finished this project. Now the next step is to make new antennas this winter and collect new coax from a telecom provider in NL to have less coax loss as with regular coax you can buy in the Ham store.

 

 

My new 2 mtr antenna

Setting up new antennas give you a lot of work to get in first instance a perfect design and than you have to collect the materials.

I use a design of DK7ZB for both type of antennas I want to build.
First the 9 element yagi's with folded dipoles and 8mm elements, the boom is made from 30mm alu. and the elements are mounted on plastic parts.

In my new setup I use 2 x 9 elem yagi stacked horizontal. The specifications down here are for a single yagi.

Gain/SWR pattern

Current profile

     1021      968   945             921                  906                     895                       889                      900                888mm  Element-lengths

     0mm      345   615            1175                1870                    2675                     3505                     4345              4980mm Element-positions

 

                               

                               

                                                            

The new 70cm antenna,

For 70cm I use also a design of DK7ZB, and this is a 23element type, a bit changed for use with the materials I have at this moment.
I also use a folded dipole on this yagi. The elements are again mounted on plastic parts as I used in the 2mtr design above.

In my new setup I use 2 x 23 elem yagi stacked horizontal. The specifications down here are for a single yagi.

                               

                                 

                                 

 

 

 

 

 

   
Cable Information LD4-50A heliax coax

 

 

                        

Standard Cable
1/2” Standard Cable, Standard Jacket LDF4-50A  
 
Characteristics
Electrical
Impedance, ohms 50 ± 1
Maximum Frequency, GHz 8.8
Velocity, percent 88
Peak Power Rating, kW 40                      
Mechanical
Outer Conductor Copper
Inner Conductor Copper-Clad Aluminium
Diameter over Jacket, in (mm) 0.63 (16)
Diameter over Copper Outer Conductor, in (mm) 0.55 (14)
Diameter Inner Conductor, in (mm) 0.189 (4.6)
Minimum Bending Radius, in (mm) 5 (125)
Cable Weight, lb/ft (kg/m) 0.15 (0.22)
 
Attenuation and Average Power
Frequency MHz Attenuation dB/100 ft. Attenuation dB/100 m Average Power, kW
30 0.357 1.17 6.46
50 0.463 1.52 4.98
150 0.815 2.67 2.83
200 0.946 3.10 2.44
894 2.09   6.05 1.10
1500 2.77   9.09  0.833
2300 3.52   11.5    0.657


 

Cable Information LDF5-50A heliax coax

 

 

               

 

Standard Cable
7/8” Standard Cable, Standard Jacket LDF5-50A  
 
Characteristics
Electrical
Impedance, ohms 50 ± 1
Maximum Frequency, GHz 5.0
Velocity, percent 89
Peak Power Rating, kW 91
Mechanical
Outer Conductor Copper
Inner Conductor Copper
Diameter over Jacket, in (mm) 1.09 (28)
Diameter over Copper Outer Conductor, in (mm) 0.98 (24.9)
Diameter Inner Conductor, in (mm) 0.355 (9.0)
Minimum Bending Radius, in (mm) 10 (250)
Cable Weight, lb/ft (kg/m) 0.33 (0.49)
 
Attenuation and Average Power
Frequency MHz Attenuation dB/100 ft. Attenuation dB/100 m Average Power, kW
30 0.195   0.641 14.1
50 0.254   0.833 10.8
150 0.449 1.47     6.12
200 0.523 1.72     5.26
894 1.18   3.87     2.34
1500 1.58   5.18     1.74
2300 2.02   6.63      0.918

 

 

 

Start | station of PD1AIQ | Antenna project | web link page | Old Pictures

this website is last updated at 01/08/05