ETS-Lindgren 3149 Hybrid Log Periodic and Bowtie (BiConiLog) - Manual (Page 8)

8 | Introduction
An antenna constructed to maximize structural integrity is better able to maintain
its electrical properties; the benefits are better measurement repeatability, lower
uncertainty values, and longer calibration validity. The Model 3149 is able to
thrive in an environment of constant use due to its rugged construction and the
implementation of these design elements:
• Custom aluminum extrusions are used for the boom material.
• Dipole elements connect with capped Allen screws for secure
attachment, yet allow repair and replacement as necessary.
• An all-weather, energy absorbing radome protects the high frequency
element.
• Tubular bow tie elements connect to the balun box using positive
aligning and easily attached compression fittings.
• The finished antenna receives a durable powder coat finish.
The Model 3149 provides a flexible mounting scheme to accommodate most
antenna towers and tripods. The antenna can be securely mounted using the
22-mm diameter stinger or the lower element boom mount.
• The stinger mount provides on-axis center point rotation of the antenna
during polarization and can be mounted to ETS-Lindgren and most
other brands of antenna towers.
• The lower element boom mount on the Model 3149 can be used with
all tripods and with ETS-Lindgren antenna masts that have an offset
cross boom.
For the steps to mount the Model 3149, see Mounting Instructions on page 17.
Standard Configuration
• Antenna
• Bow tie elements (2)
• Wrenches (2) attached to the balun box for use on bow tie
compression fittings
• Lower element boom mount includes mounting bracket and
mounting knob