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Page 19
When wiring the EHUs on the UrbanBeam Yagi, it is important to know that there are two different
types of EHUs. One of the EHUs is the Driven element, and connects to the coax cable from the radio.
The other EHU is the Director which has no coaxial connector.
NEVER DO ANY WIRING WHEN THE ELECTRONIC CONTROLLER IS CONNECTED TO THE
CONTROL CABLE.
Even if the power is turned off of the controller, damage can occur. This is the
number one cause of antenna installation failures, so please be sure to heed the advice.
Figure 1.02
gives an overview of the inside of a SteppIR EHU.
Control cable
tray for routing
cable out of EHU
(on edge of
case)
Element support
tube (EST)
Balun (the balun is only
inside EHUs that are
driven elements)
EHU terminal header
Spring reel for copper
strip (20m reel is
shown, 40m reel is
larger)
SO
-
239 connector
(for driven ele-
ments only)
Sprocket / platen
assembly
SECTION 1.1
ELEMENT HOUSING UNIT (EHU) OVERVIEW
FIG. 1.02
Serial # sticker
PREPARING THE BOOM ASSEMBLY
EHU Overview