Com-Power AM-741 - Manual

Active Monopole Antenna
Features
Range - 9 kHz - 30 MHz
Built in Amplifier
Battery Powered
Individual Calibration
Application
The 41 inch Monopole antenna is required for mak-
ing electric field emission measurements below 30
MHz per Military standards (MIL-STD-461) and FAA
(DO-160) specifications. This antenna is for emissions
measurements only. It cannot be used for transmitting.
The Active Monopole antenna is generally used in a
shielded room or in a screen room, with the equipment
under test (EUT) placed on a metal ground plane. The
41 inch rod and the ground plane behave electrically as
though a mirror image of the rod were located below the
ground, and the ground removed. Since the stainless
steel plate does not have enough surface area to mirror
the entire 41 inch rod, it is bonded to the surrounding
ground plane during use.
The AM-741 is battery powered to prevent measure-
ment errors that maybe caused by external power cables.
The ANSI equivelant capacitance subsitution (ECSM)
method is the recommended method for calibrating
AM-741 monopole antenna. The individual calibration
data will be included with each antenna.
Description
The Active Monopole antenna Model AM-741 was
designed to measure electric field strength in the fre-
quency range from 9 kHz to 30 MHz. This antenna
includes a built-in broadband amplifier covering the
frequency range of operation. The built in preampli-
fier improves the sensitivity of the antenna and also
provides a 50 Ω matched output.
The antenna amplifier is enclosed in an aluminum
enclosure. The 41 inch collapsible rod element is
connected to BNC connector located on the top the
amplifier enclosure. The amplifier enclosure is mounted
on the bottom of a 60 x 60 cm stainless steel plate.
The front panel of the AM-741 Monopole antenna has
battery status and saturation indicators. The saturation
indicator will illuminate if the if the field measured is
saturating the built in preamplifier.
The antenna can be used for 6-8 hours continious with
a fully charged battery. An external charger addapter
is included with each antenna.
The antenna has 1/4 inch x 20 threaded hole which al-
lows the AM-741 to be mounted on an antenna tripod
with matching threads. The manual and certificate of
calibration will be shipped with each unit.
AM-741
Com-Power Corporation (714) 528 - 8800 www. com-power.com [email protected]