In order for antenna leakage measure-
ments to be FCC / CENELEC compli-
ant, the dipole antenna must be held
horizontally at a distance of 10 feet / 3
meters above the ground, 10 feet / 3
meters from the cable, and 10 feet / 3
meters from any other conductors
(any metallic objects) in the vicinity.
Metal objects; including bucket lift
booms; ladder racks; and other con-
ductive hardware must be removed
from the leakage detection area or
distortion of the intended radiation
pattern will occur.
The dipole antenna used in leakage
detection is commonly referred to as
a half-wave dipole because the anten-
na is equal in length to one-half the
measured wavelength in free space.
The length of the dipole elements is
inversely related to the radio frequen-
cy to be measured—the higher the
frequency, the shorter the element
lengths. Antenna lengths can be cal-
culated using the following formula:
Length of each element of the half-
wave dipole antenna
in inches = 2,952 ÷ƒ • 0.96
in centimeters = 7500 ÷ƒ • 0.96
where ƒ = operating frequency in MHz.
For example, if you patrol tuned to
channel C (with a positive offset, i.e.
133.2625 MHz), the length of each ele-
ment can be calculated as follows:
2,952 ÷ 133.2625 MHz • 0.96 = 21.25 in
7500 ÷ 133.2625 MHz • 0.96 = 54.03 cm
Features of the HD-1
Dipole Antenna
ACTERNA’s HD-1 dipole antenna is
designed to be the primary out-of-vehi-
cle leakage detection antenna for both
field and in-home leakage detection.
Features of the HD-1 antenna
• Meets FCC and CENELEC
regulations
• Lightweight, portable, and con-
venient; handheld and/or
pole-mounted
• Can be used with all ACTERNA
CLI meters
• Adaptable for use in
field leakage testing and/or
in-home leak detection
• The HD-1 provides directionality
and accuracy in pinpointing the
leak source.
• A combination of the HD-1 anten-
na; the firmware installed in each
leakage meter; and the many fea-
tures of both of the CLI-1450 and
CLI-1750 meters, allow the field
technician to conduct quick and
accurate leak detection readings.
3-18
HD-1 dipole antenna
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