Tech Support:
www.steppir.com/support
Tel: 425.891.6134
Page 27
40m EHU return
loop assembly
Optional 6m
passive element
70-3401-01
Driven EHU
Mast Plate
w/ EZ-Eye
70-3406-01
Reflector EHU
40m EHU return
loop assembly
70-3406-01
Director EHU
CHAPTER THREE
SECTION 3.0
MOUNTING THE EHU’S ON THE BOOM
ELEMENT HOUSING UNIT (EHU) PLACEMENT
Each of the EHU’s on the DB18 Yagi are treated as a driven element, depending on what mode you are
in or direction you are facing. The coax from the ham shack feeds into an integral coax switch, which
seamlessly switches in and out the correct EHU behind the scenes. Because of this, the EHU’s can
have many different names—this can be confusing.
For the purpose of building the antenna, we refer to the elements as Director, Driven and Reflector, as
shown in
figure 3.01
below. When operating on 20m-6m, this is exactly what the EHU’s function as
then the antenna is operating in the forward direction.
All the drawings in this manual are oriented so that you are looking inward at boom with the director to
the left and the reflector to the right, as shown in
figure 3.01
.
For a detailed look at what each element is doing at any given time, refer to the antenna configuration
guide in the
Preamble section
of this manual.
FIG. 3.01
A
A
A = Optional boom truss
attachment plate
