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Page 20
CHAPTER ONE
SECTION 1.1
BOOM ASSEMBLY (continued)
With the DB42 Yagi there are quite a few components that are mounted on the boom. All of these
items are mounted using aluminum saddles. The following instructions will allow you to pre-measure
the placement of the saddles, making it much easier to assemble the required items. In addition to
marking the saddle placement, you may also want to label the marking so you can easily identify it
later.
Measuring and marking helps to simplify the process, but
NEVER
use the saddle marks as the
permanent measurement— you must always defer to the center-to-center measurements for each ele-
ment or the antenna will not function properly.
We recommend that you use an aluminum saddle half for drawing your marks on the boom. Deter-
mine your mark using the table on the following page. The measurement shown is to the closest edge
of the saddle from the starting point, then draw a line on each side of the saddle piece as shown in
figure 1.12 and figure 1.13. This prevents any possible mistakes on where the saddle edge should be
on the measurement. The truss anchor point between the boom bolts shown below in figure 1.10 is
the same configuration on each side of the boom.
The EZ-Eye is NOT at the center point of the boom. Because of this, you will have a short side and a
long side (on the 3” boom section) in relation to the EZ-Eye. Position boom as shown below when
measuring for your marks. Mount each aluminum plate and truss saddle as shown in the table, be
aware that the dimensions shown in the table below refers to the saddles closest to the reflector end
MEASURING AND MARKING THE BOOM
Continue measuring to the right
for all boom items located on the
table below. Place your respective
part at your mark and fasten to
boom
Start your measurements by
securing your measuring
tape to the edge of boom
that is 251-5/8” inches from
the EZ eye-bolt located near
center of the boom.
Using a permanent mark-
er, precisely mark the
location for placement of
each item to be placed
on the boom.
0.75”
20.75”
30.75”
84.75”
70.125”
START HERE
Boom truss bracket
Remainder of boom
FIG. 1.10
Short side of boom
Long side of boom
FIG. 1.11
EZ Eyebolt is NOT at the center of the boom