Building Yagis – Part 5 (SteppIR DB36 Continued)


Driven Element Inner Support Tube

Driven Element Inner Support Tube

We began today by installing the remaining two element housings on our SteppIR DB36. We first assembled and installed the element housing for Director 2. This step was nearly identical to what was done for the Reflector. The Driven Element housing is a different assembly due to its larger side. The first step was to install the two Inner Support Tubes onto the driven element stepper housing. These tubes are held in place with a stainless steel clamps and a set of foam rings seal the inside of the driven element housing from the weather.

The next step was to support the driven element sweeps on saw horses so that we could install them on the antenna. Note the white inner support tube extending out of the left element extension tube associated with the driven element. This is the end of the Inner Support Tube installed in the previous step.

Driven Element Loop

Driven Element Loop

With the Driven Element sweeps installed, the final footprint of the antenna can be seen. The DB36 is truly a big antenna!

Completed Element Housings on DB36

Completed Element Housings on DB36

The next step was to install the three Element Support Trusses for the elements with sweep housings (the Reflector, Driven Element and Director 2). You can see the support lines associated with the Reflector element support truss in the picture below. Similar truss assemblies were installed on the other two sweep elements and the support lines were adjusted so that the antenna elements droop about the same amount as Director 1. It is important that the ends of the sweeps droop enough to allow water which collects in the sweeps due to condensation to drain out of the ends for the sweeps. If they do not drain, the water can freeze and break the sweep housings.

Element Support Truss

Element Support Truss

The beginnings of the 80m Dipole assembly that will be installed on the upper of our two DB36 antennas is shown in the picture below. A support rope is fastened to the ends of the boom and to the element support truss posts to support the 80m Dipole.

80m Dipole Support End

80m Dipole Support End

The 80m Dipole switch is shown below. The 80m Dipole support lines from the ends of the boom are connected to the switch. The lines will support the wire for the 80m Dipole.

80m Dipole Switch

80m Dipole Switch

Well, our SteppIR DB36 is almost complete. Here’s a picture of the antenna with all of the element housings and associated trusses installed and adjusted.

DB36 with Element Truss Supports

DB36 with Element Truss Supports

We will complete the installation of the 80m Dipole, install the 6m Passive Kit, wire all of the control cables and test the antenna next. I hope to complete these steps sometime this week.

– Fred (AB1OC)

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s