6-ANTENNA MOUNTING
Assemble the mast clamp plate and U-bolts to the insulated crossarm separator
as shown in Figure 4. U-bolts will accommodate masts up to 2” in diameter.
Slip the U-bolts over the mast, orient antenna towards desired stations and
tighten U-bolts securely.
7-CABLE ROUTING
Connect cable at rear of bottom crossarm. Bring cable back to the mast at an
angle so that it is kept away from the crossarm. Leave enough slack to
remove strain from the cable and secure to the mast.
1-GENERAL DESCRIPTION
The TACO Model J-283X VHF-UHF-FM antenna is of rugged design and
will operate through the CH2 to CH83 television channels
(55-108 MHz and 470-890 MHz). It is of the log periodic design principle and
exhibits medium gain across the frequency band.
2-THEORY OF OPERATION
The antenna is comprised of 8 VHF and 7 UHF elements connected to a
parallel pair of 1¼” aluminum crossarms that form the antenna transmission
line. To accomplish end fire log periodic operation, the elements are tapered
from the front of the antenna to the back and successive dipole halves are
transposed along the antenna transmission line. An internal cable must be fed
through the lower aluminum crossarm which functions as a balun which
converts the balanced 75 ohms input at the front of the antenna to a 75 ohm
unbalanced coaxial “F” fitting. This internal “balun” effectively chokes off
the surface currents normally associated with a balanced feed and eliminates
line radiation.
3-ELECTRICAL CHARACTERISTICS (TYPICAL)
FIGURE 4
(Mast Clamp and U-Bolt Assembly)
