Introduction
|
7
1.0 Introduction
The
ETS-Lindgren
Model 3147 Log Periodic
Dipole Antenna
is a
linearly-polarized broadband
antenna designed to operate
over the frequency range of
200 MHz to 5 GHz. The
antenna was designed with
the latest revision to Part 15
of FCC Rules and
Regulations in mind. See
page 13 for specifications.
The Model 3147 is constructed from 30 elements mounted on two 6.35-mm by
12.7-mm booms. The choice of scaling factors, the various diameters of each
element, and the center-to-center spacing of the booms yield excellent VSWR
characteristics throughout the operating frequency range (see
VSWR
on
page 24). The precise design of the feed and the positioning of the elements on
the boom yield an optimum phase relationship. This causes the active region, at
any given frequency, to propagate RF energy towards the smaller elements,
leaving the elements behind it electrically dead.
The constant gain of the Model 3147 yields an antenna factor which varies
linearly with frequency, as shown in
Typical Data
on page 23. The variation is
smooth; therefore, accurate interpolation of performance between specified
frequency points is simple.
Due to the relatively high upper frequency limit, the small elements on the
Model 3147 are very thin. The antenna is equipped with an integral, low
dielectric-constant radome to protect the elements from possible damage.
Do not disassemble or drop the antenna or the
thin elements may be damaged.
Summary of Contents for ETS-Lindgren 3147
Page 1: ...Model 3147 Log Periodic Dipole Antenna User Manual...
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Page 9: ...Introduction 9...
Page 10: ...10 Introduction This page intentionally left blank...
Page 12: ...12 Maintenance This page intentionally left blank...
Page 14: ...14 Specifications This page intentionally left blank...
Page 20: ...20 Mounting Instructions This page intentionally left blank...
Page 22: ...22 Operation This page intentionally left blank...
Page 25: ...Typical Data 25 Typical Antenna Factor and Gain for Model 3147...
Page 26: ...26 Typical Data...
Page 29: ...Typical Data 29...
Page 30: ...30 Typical Data...
Page 32: ...32 Typical Data...
Page 33: ...Typical Data 33 Cable Attenuation dB at 20 C for 6 M Cable...
Page 38: ...38 Radiated Emissions Measurement This page intentionally left blank...
Page 40: ...40 Power Requirements This page intentionally left blank...
Page 41: ...Typical Antenna Patterns 41 Appendix A Typical Antenna Patterns 400 MHZ 500 MHZ...
Page 42: ...42 Typical Antenna Patterns 600 MHZ 700 MHZ...
Page 43: ...Typical Antenna Patterns 43 800 MHZ 900 MHZ...
Page 44: ...44 Typical Antenna Patterns 1 0 GHZ 1 5 GHZ...
Page 45: ...Typical Antenna Patterns 45 2 0 GHZ 2 5 GHZ...
Page 46: ...46 Typical Antenna Patterns 3 0 GHZ 3 5 GHZ...
Page 47: ...Typical Antenna Patterns 47 4 0 GHZ 4 5 GHZ...