Com-Power AD-100 Handbuch - Seite 8

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Operating Procedure

2.0 Introduction

This section describes antenna setup for use.

2.1 Setup

2.1.1 Setting up and using the antenna.
Tuned dipole antennas operate over the frequency range of 30 MHz to 1000
MHz. There are four baluns to cover the entire frequency range. Each balun
has a specifi c frequency range. It is possible to extend the element length above
and below the specifi ed frequency range of each balun. To prevent errors in
measurement, the element lengths should not be adjusted beyond frequency range
of each balun. Use the appropriate balun and elements for the frequency to be
measured.
Table 3.1 gives tuning lengths at selected frequencies for each balun. The tuning
length is measured from the center of the balun head. The collapsed length of
each of the element set is given in table 2.1. The lowest frequency balun DB-1
requires the use of two fi xed elements and the longer (II) collapsible elements
on each side of the balun up to 45 MHz. Beyond 45 MHz, the DB-1 balun uses
one fi xed length element and collapsible element (II) on each side. The DB-2
balun uses the longer collapsible elements (II) up to 125 MHz and the two
shorter collapsible elements (III) beyond it. The DB-3 balun uses only the shorter
collapsible elements (III). The DB-4 balun elements are already inserted and
fi xed.
This section explains the following:
a)
Introduction
b)
Setup
Table 2.1, Tunable dipole antenna elements
Element
I
II
III
Type
Length
Fixed
27.5
Collapsible
8.5
Collapsible
4.25
2
(in.)
AD-100 Dipole Antenna
2-1