Tech Support:
www.steppir.com/support
Tel: 425.891.6134
Page 30
CHAPTER THREE
SECTION 3.1
DIRECTOR 1 EHU (continued)
PREPARE MOUNTING PLATE FOR ATTACHING THE EST’s
All of the SteppIR EHU’s have a “diverter” inside them to direct each half of the copper-beryllium strip in the
correct direction. The Driven element on the DB42 is quite a bit longer than the normal loops, so a different
diverter system must be employed. This is the reason why the Driven element has 3/4” CPVC tubing coming
out each side, with the tubes being offset from each other as shown in
figure 3.12
.
The EST tubes on each side of the element need to be level with each other, so different sized aluminum
spacers are used to accomplish this.
Locate four 1” aluminum spacers (PN 10-1613-01). These are used on the “high” or closest side of the EHU
when facing the boom with the reflector to your left as shown in
figure 3.13
. Using two 2” aluminum saddles
halves (PN 10-1601-22), insert two 5/16” x 5” hex head bolts (PN 60-0141) and two 5/16” x 4-1/2” (PN 60-
0115) hex head bolts through the respective saddle halves and insert the 1” aluminum spacers onto the hex
head bolts as shown in
figure 3.14
. The inner saddle pairs (closest to EHU) for each side will be inserted
through the mounting plate, 1/4” spacers and the reinforcing plate as shown in
figure 3.15
.
Locate four 1/4” aluminum spacers (PN 10-1613-11). These are used on the “low” or furthest side of the
EHU when facing the boom with the reflector to your left as shown in
figure 3.16
. Using two 2” aluminum
saddles halves (PN 10-1601-22), insert two 5/16 x 4” hex head bolts (PN 60-0114) and two 5/16” x 3-3/4”
hex head bolts (PN 60-0114) through the respective saddle halves and then insert the 1/4” aluminum spac-
ers onto the hex head bolts as shown in
figure 3.17
. Attach this assembly to the element mounting plate by
inserting the thread ends of the hex head bolts through the mounting plate holes. Loosely thread on the
5/16” Nylock nuts (PN 60-0046).
There are different lengths of 5/16” hex head bolts for each saddle pair that is attached to the mounting
plate, which can be confusing.
Figure 3.18
shows the required bolt length for each saddle. See
figure 3.11
on the prior page for specific size and part number information.
FIG. 3.15
FIG. 3.18
4-1/2”
5”
4”
3-3/4”
FIG. 3.16
FIG. 3.12
FIG. 3.13
FIG. 3.14
FIG. 3.17
