ETS-Lindgren 3109 Biconical Antenna - Manual (Page 7)

Introduction | 7
1.0 Introduction
The ETS-Lindgren Model 3109 Biconical Antenna is designed to operate over
the 20 MHz to 300 MHz frequency range for generating high levels of
electromagnetic (EM) fields. The ability to handle high power levels over a
broadband makes the Model 3109 excellent for use in radiated susceptibility
testing.
The assembly design of the Model 3109 provides for easy storage and
portability. The standard biconical elements are made from welded aluminum.
The 4-to-1 ratio balun network is fabricated from TFE thermoplastics and
specially machined brass and aluminum support and contact parts. The bifilar
inductors of the balun are wound in precision machined cuts to provide high
barrier insulation between windings while simultaneously giving good coupling
between bifilar windings.
The balun acts as base on the Model 3109 and is configured to accept an
ETS-Lindgren tripod or most other tripods. For information on tripods, see
Tripod Options on page 9. For the variety of mounting options available for the
Model 3109, see Mounting Instructions on page 19.
The Model 3109 is individually calibrated at 1 m per SAE ARP 958 and 3 m and
10 m per ANSI C63.5. Actual factors and a signed Certificate of Calibration
Conformance are included.
Because slight variations in testing environments can affect the field
characteristics around an antenna, it is recommended that a field probe be used
to accurately determine the field strength in the region under test.