COM-power corporation AL-130R User manual

Page 1 of 23
INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
INSTRUCTION MANUAL
for
ACTIVE
LOOP ANTENNA
(with Remote Interface Option)
Model: AL-130R
BATTERY LOW CHARGING OUTPUT 50Ω
AL-130R ACTIVE LOOP ANTENNA
9 kHz to 30 MHz
RF OUTPUT
ON/OFF
REMOTE ACCESSPOWER REMOTE LINK
6 VDC, 500 mA
-
+
RF OUTPUT ON SATURATION
LOOP ANTENNA
AL-130R

Page 2 of 23
INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
Table of Contents
1.0 Introduction ........................................................................................................... 4
2.0 Products Available from Com-Power ................................................................. 5
3.0 Product Information .............................................................................................. 6
3.1 Incoming Inspection....................................................................................................... 6
3.2 Package Inventory ......................................................................................................... 6
3.3 Product Safety Information ........................................................................................... 7
3.3.1 Product Hazard Symbols Definitions........................................................................................... 7
3.3.2 Product Warning/Caution Statements...................................................................................... 7
3.3.3 General Safety Instructions.......................................................................................................... 7
3.4 Product Connections/Controls..................................................................................... 8
3.5 Product Specifications ................................................................................................. 11
4.0 Measurement Correction Factors ..................................................................... 13
4.1 Antenna Factors............................................................................................................ 14
4.2 Preamplifier Gain Factors ............................................................................................ 14
4.3 Insertion Loss Factors..................................................................................................... 15
4.3.1 Insertion Loss Measurement....................................................................................................... 16
4.3.1.1 Insertion Loss Measurement Procedure................................................................................... 16
5.0 Using your AL-130R Loop Antenna .................................................................... 17
5.1 Field Strength Measurement Calculations................................................................ 17
5.2 Antenna Positioning...................................................................................................... 19
5.3 Using RAI-100 Remote Antenna Interface Unit ........................................................ 20
6.0 Calibration and Re-Calibration ......................................................................... 20
7.0 Warranty............................................................................................................... 22

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INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
List of Figures
FIGURE 1 - AL-130R Connections/Controls Diagram – Front Panel 8
FIGURE 2 - AL-130R Connections/Controls Diagram – Rear Panel 9
FIGURE 3 - AL-130R Battery Access & Tripod Mounting Hole - Bottom Panel 9
FIGURE 4 - RAI-100 Connections/Controls Diagram 10
FIGURE 5 - AL-130R Active Loop Antenna Dimensions 12
FIGURE 6 - RAI-100 Remote Antenna Interface Dimensions 12
FIGURE 7 - Setup for Reference Measurements (R) 16
FIGURE 8 - Setup for Insertion Loss Measurements (I) 16
FIGURE 9 - Typical measurement system for AL-130R 17
FIGURE 10 - Rotation of Loop about its Vertical Axis 19
FIGURE 11 - Rotation of Loop about its Horizontal Axis 19
FIGURE 12 - Fiber Optic Connection from AL-130R to RAI-100 20

Page 4 of 23
INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
1.0 Introduction
This manual includes descriptions of front and rear panel ports, controls and indicators;
product specifications, safety precautions, operational instructions, measurement
guidelines and warranty information.
Information contained in this manual is the property of Com-Power Corporation. It is
issued with the understanding that the material may not be reproduced or copied
without the express written permission of Com-Power.

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INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
AntennasAntennaKits AbsorbingClamps Coupling/Decoupling
Networks(CDN)
CombGeneratorsCurrentProbes EmissionsTest
Systems
ConductedImmunity
TestSystems
ImpedanceStabilization
Networks(ISN)
LineImpedanceStabilization
Networks(LISN)
AntennaMasts Near‐Fiel
d

ProbeSets
PreamplifiersPowerAmp
l
ifiers
S
pectrumAnalyzers ProductSafetyTest
Equipment
TransientLimitersTurntablesAntennaTripods TelecomTest
Systems
2.0 Products Available from Com-Power
www.com-power.com

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INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
3.0 Product Information
3.1 Incoming Inspection
WARNING – To avoid possibility of electrical shock, do not apply power to the
Com-Power AL-130R Active Loop Antenna if there is any evidence of shipping
damage. If shipping damage to the product or any its accessories is suspected,
or if the package contents are not complete, contact Com-Power or your Com-
Power distributor.
Please check the contents of the shipment against the package inventory in
section 3.2 to ensure that you have received all applicable items.
3.2 Package Inventory
STANDARD ITEMS:
9AL-130R Active Loop Antenna
96 VDC (unregulated), 500 mA Battery Charger / AC Power Adapter
OTIONAL ITEMS:
9RAI-100 Remote Antenna Interface
9Fiber Optic Cable
96 VDC (unregulated), 500 mA, AC Power Adapter

Page 7 of 23
INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
3.3 Product Safety Information
3.3.1 Product Hazard Symbols Definitions
The hazard symbols appearing on the product exterior are defined below.
The yellow triangle with an exclamation mark indicates the presence of
important operating and/or maintenance (servicing) instructions in the
literature accompanying the product.
3.3.2 Product Warning/Caution Statements
WARNING: TO PREVENT ELECTRIC SHOCK, DO NOT OPEN COVER. SERVICING ONLY BY
QUALIFIED PERSONNEL. NO USER SERVICEABLE PARTS INSIDE
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH THE
SAME TYPE AND RATING OF FUSE.
3.3.3 General Safety Instructions
The following safety instructions have been included in compliance with safety standard
regulations. Please read them carefully.
• READ AND RETAIN INSTRUCTIONS - Read all safety and operating instructions before
operating the instrument. Retain all instructions for future reference.
• HEED WARNINGS - Adhere to all warnings on the instrument and operating instructions.
• FOLLOW INSTRUCTIONS - Follow all operating and use instructions.
• WATER AND MOISTURE - Do not use the instrument near water.
• WALL OR CEILING MOUNTING - Do not mount the instrument on a wall or ceiling.
• HEAT - The instrument should be situated away from heat sources such as heat registers or
other instruments which produce heat.
• POWER SOURCES - Connect the instrument only to the type of power source described in
the operating instructions or as marked on the instrument.
• POWER CORD PROTECTION - Place power supply cords so that they are not likely to be
walked on or pinched by items placed on them or against them.
• CLEANING – Clean the instrument only as recommended by the manufacturer.
• DEFECTS AND ABNORMAL STRESS - Whenever it is likely that the normal operation has been
impaired, make the equipment inoperable and secure it against further operation.
• DAMAGE REQUIRING SERVICE - Instrument should be serviced by qualified personnel when:
9The power supply cord or the plug has been damaged.
9Objects have fallen or liquid has been spilled into the instrument.
9The instrument has been exposed to rain.
9The instrument does not appear to operate normally.
9The instrument has been dropped, or the enclosure has been damaged.
• SITTING OR CLIMBING - Do not sit or climb upon the instrument or use it as a step or ladder.

Page 8 of 23
INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
3.4 Product Connections/Controls
FIGURE 1 - AL-130R Connections/Controls Diagram – Front Panel
Main Power Switch and LED Indicator
1
Turns on/off all loop antenna interface/control circuits, but NOT internal amplifier (standby
mode)
RF Output ON/OFF Toggle Switch
2
Turns on/off loop antenna amplifier circuit
Remote Access Port
3
Fiber optic port for connection to RAI-100 Remote Antenna Interface
Remote Link LED Indicator
4
Indicates active connection with RAI-100 Remote Antenna Interface
RF Output On LED Indicator
5
Indicates that RF amplifier circuit is active
Saturation LED Indicator
6
Indicates that the amplifier is in saturation
Battery Low Indicator
7
Indicates that the battery level is getting low, and will soon require charging
Antenna Output Port
8
50 ohm coaxial port for connection to measuring instrument
Power Input Port
9
Power input port for connection of provided battery charger / AC adapter
Battery Charging Indicator
10
Indicates that the internal battery pack is being charged
BATTERY LOW CHARGING OUTPUT 50Ω
AL-130R ACTIVE LOOP ANTENNA
9 kHz to 30 MHz
RF OUTPUT
ON/OFF
REMOTE ACCESS
POWER REMOTE LINK
6 VDC, 500 mA
-
+
RF OUTPUT ON SATURATION
1234
5 6 7 8 9 10

Page 9 of 23
INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
FIGURE 2 - AL-130R Connections/Controls Diagram – Rear Panel
Fuse Mounting Assembly
11
Provides access to input power fuse
FIGURE 3 - AL-130R Battery Access & Tripod Mounting Hole - Bottom Panel
Antenna Mounting Hole (¼” x 20 threads per inch)
12
For mounting loop antenna to tripod or other mounting structure
Battery Access Panel
13
Provides access to internal battery packs
250V, 200 mA
CAUTION :
SERVICING ONLY BY
QUALIFIED PERSONNEL
www.com-power.com
11
BATTERY:
6V, 2.0 Ah, NiMH
CAUTION :
Use the charger supplied by
Com-Power. Other chargers
may damage the batteries.
12
13

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INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
FIGURE 4 - RAI-100 Connections/Controls Diagram
RF Output ON/OFF Toggle Switch
1
Turns on/off loop antenna amplifier circuit
RF Output On LED Indicator
2
Indicates that RF amplifier circuit is active
Power On LED indicator
3
Indicates that the loop antenna interface/control circuitry is powered (stand-by mode)
Battery Low Indicator
4
Indicates that the battery level is getting low, and will soon require charging
Saturation LED Indicator
5
Indicates that the amplifier is in saturation
Remote Access Port
6
Fiber optic port for connection to AL-130R Loop Antenna
Remote Link LED Indicator
7
Indicates active connection with AL-130R Loop Antenna
Power Input Port
8
Power input port for connection of provided AC adapter
REMOTE ACCESS REMOTE LINK
TX RX
RF OUTPUT
ON/OFF
RAI-100 REMOTE ANTENNA INTERFACE
BATTERY LOW
RF OUTPUT ON SATURATION
POWER ON
6 VDC, 500 mA
-
+
67
543
2
1
8
TOP VIEW
REAR SIDE VIEW RIGHT
SIDE VIEW

Page 11 of 23
INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
3.5 Product Specifications
Technical
Product Active Loop Antenna w/Remote Interface
Frequency Range 9 kHz to 30 MHz
Standard(s) ANSI C63.4, CISPR 11/EN 55011, etc.
Loop Outside Diameter 19.7” (50 cm)
Output Impedance 50Ω(nominal)
H-Field Antenna Factors -38.1 to -36.1 (average: 38.6) [dB(Ω/m)]
E-Field Antenna Factors 13.4 to 16.4 (average: 14.9)
[
dB
(
m-1
)]
Saturation Level >1 V/m/>120 dBμV/m (>2.65 mA/m/>68.5 dBμA/m)
Electrical
DC Power Input 6 VDC
AC to DC Power Adapter 6 VDC (unregulated), 500 mA
Fuse Type 250V, 200 mA, Type T
Battery Pack 6 VDC 2.0 Ah, NiMH (rechargeable)
Typical Battery Life 10-12 hours (new, fully charged battery)
RF Connectors
Antenna Port Connector BNC-type (female)
Power Input Port 5.5/2.5 mm Power Jack
Fiber Optic Connector Avago Duplex Latching POF jack
Mechanical
Dimensions (H)x(W)x(D) 20.35” x 19.7” x 10.9” (51.7 x 50 x 27.7 cm)
Weight 5.5 lbs (2.5 kg)
Environmental
Operating Temperature 40°F to 104°F (5°C to 40°C)

Page 12 of 23
INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
FIGURE 5 - AL-130R Active Loop Antenna Dimensions
FIGURE 6 - RAI-100 Remote Antenna Interface Dimensions
RF OUTPUT
ON/OFF
RAI-100 REMOTE ANTENNA INTERFACE
BATTERY LOW
RF OUTPUT ON SATURATION
POWER ON
REMOTE ACCESS REMOTE LINK
TX RX
TOP VIEW
REAR SIDE VIEW RIGHT
SIDE VIEW
6 VDC, 500 mA
-
+
(W) 4.41”
(112 cm)
(D) 2.56”
(65 cm)
(D)
2.56”
(65 cm)
(H)
2.68”
(68 cm)
(D)
10.9”
(27.7 cm)
7.3”
(18.6 cm)
(W)
19.7”
(50 cm)
(H)
20.35”
(51.7 cm)
0.75”
(1.9 cm)
2.56”
(6.5 cm)
BATTERY LOW CHARGING OUTPUT 50Ω
AL-130R ACTIVE LOOP ANTENNA
9 kHz to 30 MHz
RF OUTPUT
ON/OFF
REMOTE ACCESSPOWER REMOTE LINK
6 VDC, 500 mA
-
+
RF OUTPUT ON SATURATION
LOOP ANTENNA
AL-130R

Page 13 of 23
INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
4.0 Measurement Correction Factors
Anyone familiar with EMI radiated emissions measurements understands that
‘uncorrected’ values measured on your spectrum analyzer or EMI receiver are essentially
meaningless without the appropriate ‘correction’ factors for the individual components
of your measurement system.
A typical radiated emissions measurement system can include any combination of the
following components, all of which have a quantifiable effect on the measured voltage;
and therefore must be accounted for to accurately ‘correct’ your reading:
•Receiving antenna(s)
•Preamplifier(s)
•Coaxial measurement cable(s)
•Attenuation Pad(s)
•Connecting Adapter(s)
•Low-Pass, High-Pass or Notch Filter(s)
•DC Block(s)
•Other similar measurement components
We can separate the factors associated with the above components into three basic
categories:
1) Antenna (or transducer) Factors,
2) Gain Factors (for preamplifiers); and,
the cables, attenuators, adapters, filters, etc., can all be lumped into one general
category…
3) Insertion Loss Factors
These three categories of correction factors are discussed in the following sections.
Most of today’s spectrum analyzers and EMI receivers allow entry of these factors directly
into the instrument. You can then group the factors into factor sets. This makes things
very convenient, and allows the instrument to display/output test results as the corrected
values, with no further correction necessary. These newer instruments will also allow you
to enter the specification limits, so that PASS/FAIL can be determined instantaneously.
Older instruments, however, do not have this capability, so manual correction, or
correction through data acquisition PC software (or other means) is needed.
Whatever the case may be, applying the CORRECT correction factors is obviously key to
achieving accurate results. A simple typo when entering factors into your instrument or
PC software will give you incorrect data every time a test is performed until such time
that you notice the mistake, or until you recalibrate and enter the new factors. It is a
good idea to double-check your entries.

Page 14 of 23
INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
4.1 Antenna Factors
Your AL-130R Active Loop Antenna is provided with two sets of active antenna
factors; Electric Field (E-field) Factors and Magnetic Field (H-Field) Factors. The
relationship between E-field and H-Field is given below.
Determining which factor is to be used will depend on the measurement units
used to define the specification limit.
If the limit is expressed in terms of magnetic field (Amps per meter), then the
magnetic (H-Field) factors should be used.
If the limit is expressed in terms of electric field (Volts per meter), then the electric
(E-Field) factors should be used.
In either case (E or H-Field), the factor is added to the measured value in order to
convert, or correct your measured value.
4.2 Preamplifier Gain Factors
Our second category of correction factors are gain factors for preamplifiers.
Preamplifiers are used to increase measurement sensitivity by increasing signal to
noise ratio. This is necessary when measuring low signal levels which would
otherwise be buried below the inherent noise floor of the measuring instrument,
typically a spectrum analyzer or EMI receiver. Ideally, input signals levels are
increased proportionate to the preamp’s gain, without significantly increasing the
overall system noise level.
The AL-130R is an Active Loop Antenna, and contains an internal preamplifier, so
additional signal amplification should not be needed. Additionally, the
preamplifier gain values are included in either factor set, so no additional
measurement correction is necessary.
E-Field Strength
(dBμV/m)
=
Measured Voltage
(dBμV)
+
Active E-Field Antenna Factor
[dB(m
-1
)]
ELECTRIC FIELD EQUATIONS
(VOLTS per meter)
=
[H-Field] Strength (A/m)
x377Ω
V/m
=
[H-Field] Strength (dBA/m)
+51.5
dBV/m
=
Current (dBA) [E-Field] Factor +51.5 dB
dBV/m
=
Current (dBA) [H-Field] Factor
dBV/m
=
Voltage (dBV) +[E-Field] Factor
dBV/m
MAGNETIC FIELD EQUATIONS
(AMPS per meter)
=
[E-Field] Strength (V/m)
377Ω
A/m
=
Voltage (dBV) +[E-Field] Factor
51.5
dBA/m
=
[E-Field] Strength (dBV/m)
51.5
dBA/m
=
Voltage (dBV) +[H-Field] Factor
dBA/m
H-Field Strength
(dBμA/m)
=
Measured Voltage
(dBμV)
+
Active H-Field Antenna Factor
[dB(Ω/m)]
=
H-Field
(magnetic field)
51.5
dB Ω
(Log [ 377Ω ])
-1
E-Field
(electric field)
=
377Ω
(20*Log[51.5 dBΩ])
H-Field
(magnetic field)
E-Field (electric field)
...or, in linear terms:

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INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
4.3 Insertion Loss Factors
As discussed previously, our third category of correction factors is insertion loss
factors. These factors can include the insertion loss values of coaxial cables,
band-pass or notch filters, attenuation pads, connecting adapters, etc. Basically,
it includes any measurement system component (cable, adapter, combiner,
divider or any other device) installed in-line with your measurement path having
inherent insertion loss over the frequency range of the measurements,
intentionally or unintentionally, beyond that which is considered to be negligible.
If the exact insertion loss factors (or values) are unknown for one or more
component(s) of your measurement system, refer to section 4.3.1.
Insertion loss factors (or values) must be added to the measured values in order to
obtain the ‘corrected’ values. So, we can update our field strength calculation
formula as follows:

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AL-130R ACTIVE LOOP ANTENNA
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19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
4.3.1 Insertion Loss Measurement
Insertion Loss values for coaxial cables and most measurement system
components having a single coaxial input and output, such as
attenuators, filters, dc blocks, etc., can be easily determined through a
simple calibration process.
All that is typically needed is the following:
9(2) short coaxial cables and ‘barrel’ adapter to connect them together;
and,
either:
9a network analyzer or measuring instrument (spectrum analyzer or EMI
receiver) with tracking generator;
or:
9a measuring instrument (spectrum analyzer or EMI receiver); and,
9a stable signal source with the appropriate frequency capabilities, such as
a signal generator, function generator, or even a Com-Power Comb
Generator.
4.3.1.1 Insertion Loss Measurement Procedure
1) REFERENCE MEASUREMENTS (R) - With the equipment set up as
shown in Figure 3, measure and record the signal level (in dBμV)
at several frequencies over the frequency range to be
calibrated.
FIGURE 7 - Setup for Reference Measurements (R)
2) INSERTION LOSS MEASUREMENTS (I) – Without changing any
equipment settings, and with the equipment set up as shown in
Figure 4, measure and record the signal level (in dBμV) at the
same frequencies used in Step 1.
FIGURE 8 - Setup for Insertion Loss Measurements (I)
3) Calculate the insertion loss factor (in dB) for each frequency
using the following formula:
Insertion Loss Factor = (R) minus (I)
Signal Source
Measuring
Instrument
coaxial cables
‘barrel’ adapter
Signal Source
Measuring
Instrument
coaxial cables
system component
to be calibrated
X

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REV112216
5.0 Using your AL-130R Loop Antenna
5.1 Field Strength Measurement Calculations
As discussed in section 4, the measured values must be corrected for preamplifier
gain and any losses incurred along the measurement path.
FIGURE 9 - Typical measurement system for AL-130R
Let’s go through two sets of example calculations. In the first example, we will
convert an uncorrected voltage measurement into a electric field strength for
comparison to the FCC Part 15.209 limit of 30 μV/m (29.5 dBμV/m) at 30 meters
distance. And, in the second, we will convert the same uncorrected voltage
value into a magnetic field strength for comparison to the CISPR 11 magnetic
field strength limit of 3 dBμA/m at a 3-meter distance.
BATTERYLOW CHARGING OUTPUT50Ω
AL-130R ACTIVE LOOP ANTENNA
9 kHz to 30 MHz
RFOUTPUT
ON/OFF
REMOTEACCESS
POWER REMOTELINK
6VDC, 500 mA
-
+
RFOUTPUT ON SATURATION
LOOPANTENNA
AL-130R
REMOTEACCESS REMOTELINK
TX RX
RFOUTPUT
ON/OFF
BATTERYLOWRFOUTPUTON SATURATIONPOWERON
RAI-100REMOTE ANTENNA INTERFACE

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REV112216
EXAMPLE:
We’ll use the measurement system shown in Figure 9, and assume a 3-
meter separation distance between the source and the antenna. We
observe a signal at 30 MHz using the spectrum analyzer, and its
[uncorrected] amplitude is exactly 38 dBμV.
For the system shown above, there are three (3) correction factors
needed:
1) The AL-130R Active E-Field Antenna Factor
2) The AL-130R Active H-Field Antenna Factor
3) The Insertion Loss Factor for the long cable connecting the AL-130R
to the measuring instrument.
We’ll assume that the insertion loss of the cable at 30 MHz is 2 dB. And, by
referring to the typical antenna factor tables in Section 8, we see that the
Active E-Field Factor is 12.58 dB/m and the Active H-Field Factor is -38.92
dBΩ/m (in practice, you will use your actual calibrated factors rather than
the typical factors). E-Field calculations:
Measured amplitude @ 30 MHz,
with a 3-meter separation distance = 38 dBμV
Active E-Field Antenna Factor @ 30 MHz = 12.58 dB/m
Insertion Loss of Long Coaxial Cable @ 30 MHz = 2 dB
=52.58 dBμV/m
@ 3 meters
Distance factor (30 meters to 3 meters) = 40 dB
Equivalent E-Field Strength @ 30 meters = 12.58 dBuV/m
FCC Part 15 Field Strength Limit @ 30 meters = 29.5 dBμV/m
Limit Δ(margin) = -16.92 dB
And, the H-Field calculations:
Measured amplitude @ 30 MHz,
with a 3-meter separation distance = 38 dBμV
Active H-Field Antenna Factor @ 30 MHz = -38.92 dBΩ/m
Insertion Loss of Long Coaxial Cable @ 30 MHz = 2 dB
=1.08 dBμA/m
@ 3 meters
CISPR 11 H-Field Strength Limit @ 3 meters = 3 dBμA/m
Limit Δ(margin) = -1.92 dB
H-Field Strength
(dBμA/m)
=
Measured Voltage
(dBμV)
+
Active H-Field
Antenna Factor (dBΩ/m)
Cable Loss
(dB)
+
E-Field Strength
(dBμV/m)
=
Measured Voltage
(dBμV)
+
Active E-Field
Antenna Factor (dB/m)
+
Cable Loss
(dB)

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AL-130R ACTIVE LOOP ANTENNA
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19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
5.2 Antenna Positioning
As per most regulatory test procedures, the loop antenna is positioned at a fixed,
1-meter height above the ground, with a separation distance of three and thirty
meters from the Equipment Under Test (EUT).
The reference point, at which the height above the ground is measured, varies
from standard to standard. Typically, it is either at the center-point of the loop
(ANSI C63.4), or at the bottom of the loop (CISPR 11).
Rotating of the loop about its vertical axis (as shown in Figure 10), in an
exploratory manner in order to obtain the highest amplitude, is typically required.
And, in some cases, rotating of the loop about its horizontal axis (as shown in
Figure 11), may also be required, depending on the test standard.
FIGURE 10 - Rotation of Loop about its Vertical Axis
FIGURE 11 - Rotation of Loop about its Horizontal Axis

Page 20 of 23
INSTRUCTION MANUAL
AL-130R ACTIVE LOOP ANTENNA

19121 El Toro Rd ●Silverado, California 92676 ●[phone] ●com-power.com
REV112216
5.3 Using RAI-100 Remote Antenna Interface Unit
Locate the RAI-100 Remote Antenna Interface in a convenient, conspicuous
location near the measurement equipment. Connect the supplied
AC adapter to an appropriate power source, and connect the plug
end of its cord into the RAI-100.
Secure the AL-130R Loop Antenna into position for the
measurements. Connect the AL-130R to the RAI-100 Remote
Interface Unit using the supplied fiber optic cable as shown in Figure 12.
FIGURE 12 - Fiber Optic Connection from AL-130R to RAI-100
Once connected, the link will be established automatically. Once the link has
been established, the green REMOTE LINK LED indicator on both the RAI-100 and
AL-130R should both be lit.
Now, turn on the Active Antenna’s RF Output by
pushing the RF OUTPUT ON/OFF pushbutton on the
RAI-100 (or on the AL-130R). As long as the RF
OUTPUT ON LED Indicator is lit, and the red
SATURATION LED indicator is NOT lit, your loop
antenna is ready to measure. If the SATURATION
LED indicator turns on during the test, the magnitude of the field is outside of the
antenna’s dynamic range, which can cause measurement inaccuracies due to
unintended, non-linear operation. Avoid making measurements whenever
possible when the SATURATION indicator is lit.
BATTERYLOW CHARGING OUTPUT50Ω
AL-130RACTIVE LOOP ANTENNA
9kHz to 30 MHz
RFOUTPUT
ON/OFF
REMOTEACCESSPOWER REMOTELINK
6VDC, 500 mA
-
+
RFOUTPUT ON SATURATION
LOOPANTENNA
AL-130R
REMOTEACCESS REMOTE LINK
TX RX
6 VDC, 500 mA
-
+
RAI-100 REMOTE ANTENNA INTERFACE
BATTERY LOW
RF OUTPUT ON SATURATION
POWER ON
RF OUTPUT
ON/OFF