Com-Power AM-741 User Manual
Features
Range - 9 kHz - 30 MHz
Built in Amplier
Battery Powered
Individual Calibration
Active Monopole Antenna
AM-741
Description
The Active Monopole antenna Model AM-741 was
designed to measure electric eld strength in the frequency range from 9 kHz to 30 MHz. This antenna
includes a built-in broadband amplier covering the
frequency range of operation. The built in preamplier improves the sensitivity of the antenna and also
provides a 50 Ω matched output.
The antenna amplier is enclosed in an aluminum
enclosure. The 41 inch collapsible rod element is
connected to BNC connector located on the top the
amplier enclosure. The amplier 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 eld measured is
saturating the built in preamplier.
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 allows the AM-741 to be mounted on an antenna tripod
with matching threads. The manual and certicate of
calibration will be shipped with each unit.
Application
The 41 inch Monopole antenna is required for making electric eld emission measurements below 30
MHz per Military standards (MIL-STD-461) and FAA
(DO-160) specications. 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 measurement 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.
Com-Power Corporation (714) 528 - 8800 www. com-power.com sales@com-power.com
Specications
-4.00
-3.00
-2.00
-1.00
0.00
1.00
2.00
3.00
4.00
0.001 0.010 0.100 1.000 10.000 100.000
dB
MHz
Frequency Range: 9 kHz - 30 MHz
Flatness: ±1 dB
Output Impedance: 50 Ohm
Connector Type: BNC (f)
Collapsible Element Length: 41 inches (fully extended)
Base Plate: 24 x 24 inches (60 x 60 cm)
Battery Type: 6 V NimH
Charger Input: 6 VDC 500, mA
Tripod mount: 1/4 x 20 inch threads hole
Size: see below
Weight: 19 lbs. (8.6 kg)
Mechanical Outline
Bottom VIEW
24.0"
15.5"
7"
24.0"
SIDE
VIEW
41"
24.0"
2.0"
Typical AM-741 Characteristics using ANSI C63.5 ESCM Calibration Method
All values are typical values unless specied.
Specications are subject to change without notice.
Com-Power Corporation 114 , Olinda Drive, Brea, California 92823 (714) 528 - 8800 www.com-power.com
Field strength (dBuV/m) = Output measured(dBuV) + Antenna factor(dB)
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