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DRIVEN ELEMENT (continued)
PREPARE MOUNTING PLATE FOR ATTACHING THE EST’s
CHAPTER THREE
SECTION 3.1
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 DB36 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 3.11
.
The EST tubes on each side of the element need to be level with each other, so different sized alumi-
num 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 3.12
. Using two 2” alumi-
num saddles halves (PN 10-1601-22), insert the 5/16” x 4-1/2” hex head bolts (PN 60-0115) through
the saddle halves and insert the 1” aluminum spacers onto the hex head bolts. Attach this assembly to
the element mounting plate by inserting the thread ends of the hex head bolts as shown in
figure 3.13
.
Loosely thread on the 5/16” Nylock nuts (PN 60-0046). Repeat for the second assembly.
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 3.14
. Using two 2”
aluminum saddles halves (PN 10-1601-22), insert the 5/16” x 3-3/4” hex head bolts (PN 60-0114)
through the saddle halves and insert the 1/4” aluminum spacers onto the hex head bolts. Attach this
assembly to the element mounting plate by inserting the thread ends of the hex head bolts as shown in
figure 3.15
. Loosely thread on the 5/16” Nylock nuts (PN 60-0046). Repeat for the second assembly.
Note that when the inner saddle pairs are mounted (the ones closest to the EHU), the hex head bolts
will also need to be inserted through the top portion of the reinforcing plate as shown in
figure 3.15
.
Figure 3.16
shows the completed assembly.
FIG. 3.11
FIG. 3.12
FIG. 3.14
FIG. 3.13
FIG. 3.15
FIG. 3.16