ETS-Lindgren 3301C Active Monopole - Manual (Page 7)

1.0 Introduction
The ETS-Lindgren
Model 3301C Active
Monopole Antenna is a
broadband, high sensitivity
electric-field receiving
antenna. The Model 3301C is
composed of:
• Monopole element
• Counterpoise
• Broadband, high input
impedance preamplifier
The monopole and
counterpoise function
together as an electrically
short antenna over ground
plane. The preamplifier
provides impedance
transformation from the high
impedance at the base of the
monopole to the 50 ohms
required by most receiving
systems, and provides power
gain to allow the sensing of
low-level signals.
The Model 3301C is designed to provide reception of an electric field in a signal
band without tuning or band switching from 30 Hz to 50 MHz. The 3 dB roll off
points for the antenna factor are at 170 Hz and 30 MHz. Between 250 Hz and
20 MHz, the antenna factor is flat within +/- 1 dB. Despite the roll of the antenna
factor, the usable range is 30 Hz to 50 MHz.
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