Advanced Antennas
10401 Roselle Street Phone: (800) 404-2832
San Diego, CA 92121 Page 3 of 20
SECTION 1. GENERAL DESCRIPTION
The LPD-100M1G is a collapsible, lightweight, medium-gain, log-periodic array designed to
transmit or receive over the frequency range of 100 MHz to 1.1 GHz. It is linearly polarized, and
its construction allows orientation of polarization in any plane with an optional universal joint (see
Figure 1-2). The log-periodic design produces a linear polarized antenna with very broadband
characteristics and a unidirectional radiation pattern.
The LPD-100M1G is characterized by an unusually high front-to-back ratio well in excess of 20
dB at all frequencies in the band. The VSWR is excellent over the entire band (see Figure 2-1).
The power gain varies somewhat with frequency, averaging about 6 dBi over the band (see Figure
2-2). The antenna can be used to make accurate electric field strength measurements, and for
this purpose an individually calibrated antenna factor (AFE) curve can be optionally provided with
each antenna. For a typical antenna factor curve, see Figure 2-3.
The LPD-100M1G is capable of handling a substantial amount of power for use with a transmitter.
The amount of CW power that can be applied is limited primarily by heating in the cable, is higher
at the low frequencies than at the high end of the band. The peak power handling is limited by the
voltage developed in the connectors and at the feed point, is a function of the VSWR. Although
the antenna is weather resistant, power should be applied only with discretion when the structure
is wet.
The LPD-100M1G is supplied in kit form for compactness in packaging. No tools are required for
assembly. The boom comes in three sections, which are held together by metal inserts attached
to the middle and front sections of the boom. There are no parts which are longer than 30.5”.
