A.H. Systems AK-2G Manuale utente

A.H. Systems AK-2G Antenna Kit

A.H. Systems inc. – January 2007

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AK-2G

Antenna Kit

Operation Manual

A.H. Systems AK-2G Antenna Kit

A.H. Systems inc. – January 2007

REV B 2

TABLE OF CONTENTS

WARRANTY

INTRODUCTION

GENERAL INFORMATION

OPTIONAL EQUIPMENT

FORMULAS

MAINTENANCE

A.H. Systems AK-2G Antenna Kit

A.H. Systems inc. – January 2007

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WARRANTY INFORMATION

A.H. Systems Inc., warrants that our Antennas, Sensors and Probes will be free from

defects in materials and workmanship for a period of three (3) years. All other products

delivered under contract will be warranted for a period of two (2) years. A.H. Systems'

obligation under this warranty shall be limited to repairing or replacing, F.O.B.

Chatsworth, California, each part of the product which is defective, provided that the

buyer gives A.H. Systems notice of such defect within the warranty period commencing

with the delivery of the product by A.H. Systems.

The remedy set forth herein shall be the only remedy available to the buyer, and in no

event shall A.H. Systems be liable for direct, indirect, incidental or consequential

damages.

This warranty shall not apply to any part of the product which, without fault of A.H.

Systems has been subject to alteration, failure caused by a part not supplied by A.H.

Systems, accident, fire or other casualty, negligence, misuse or normal wear of

materials.

Except for the warranty set forth above, there are no other warranties, expressed or

implied, with respect to the condition of the product or it's suitability for the use intended

for them by the buyer.

For prompt service, please contact our service department for a Return Material

Authorization Number before shipping equipment back to us.

A.H. Systems AK-2G Antenna Kit

A.H. Systems inc. – January 2007

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INTRODUCTION

Shown: AK-18G

SPECIFICATIONS

Model Number Frequency

Range Antenna Factor (dB/m)

SAS-510-2 290 MHz – 2000 MHz 14 to 32

SAS-542 20 MHz – 330 MHz 9 to 23

SAS-550-1B 9 KHz – 60 MHz -1 to 3

SAS-560 20 Hz – 2 MHz 18 to 15

Transfer Impedance

BCP-510 20 Hz – 1 MHz -40 to –30

BCP-511 20 KHz – 100 MHz -1 to 1

Attenuation

SAC-213 Up to 5 GHz 6.5 dB @ 5 GHz

OPTIONAL EQUIPMENT

Gain / Attenuation

PAM-0202 20 MHz – 2 GHz 31 dB

A.H. Systems AK-2G Antenna Kit

A.H. Systems inc. – January 2007

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GENERAL INFORMATION

INTENDED PURPOSES

This equipment is intended for general laboratory use in a wide variety of industrial

and scientific applications, and designed to be used in the process of generating,

controlling and measuring high levels of electromagnetic Radio Frequency (RF)

energy. It is the responsibility of the user to assure that the device is operated in a

location which will control the radiated energy such that it will not cause injury and

will not violate regulatory levels of electromagnetic interference.

GENERAL DESCRIPTION

The A.H. Systems AK-2G antenna kit series consist of five E-field antennas, one

magnetic loop antenna, and two current probes. Each of the antennas and probes

are provided with calibrations when connected to a 50 ohm input receiver or

spectrum analyzer.

Each of the E-field antennas mount directly to the tripod azimuth and elevation

head. The azimuth and elevation head allows the operator to vary the antenna

azimuth (direction) and to change the antenna polarity (vertical or horizontal).

Cables and an adapter are provided to connect each antenna and probe to either

a BNC or N type connector on the receiver. Cable calibrations are supplied.

To obtain the field strength of the signal being measured, the operator must add

the receiver reading in dBuV, the antenna factor in dB, and the cable attenuation in

dB. This yields the field strength in dBuV/m. Calibrations for the E-field antennas

are supplied at appropriate spacings (1, 3, and 10 meter) to comply with various

specification requirements.

E-FIELD ANTENNAS

SAS-510-2 Log Periodic Antenna 290 MHz - 2000 MHz

The log periodic antenna comes assembled and ready to use.

Operation: Attach the antenna to the tripod azimuth and elevation head through

the screw hole in the antenna base. Connect a cable between the antenna

connector and the receiver. The log periodic beamwidth is 65 degrees and it

should be pointed or aimed in the direction that the received signal is coming from.

SAS-542 Biconical Antenna 20 MHz - 330 MHz

The biconical antenna consists of the SAS-542 balun assembly and two folding

biconical elements.

Operation: Attach the balun assembly to the tripod thru the screw hole in the

balun assembly base. Screw the two biconical elements into the 'tee' end of the

balun assembly. Open the antenna elements completely and secure in open

A.H. Systems AK-2G Antenna Kit

A.H. Systems inc. – January 2007

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position by tightening the knurled knobs in the element caps. Connect a cable

between the antenna connector and the receiver. The biconical beam pattern is

similar to a dipole response.

SAS-550-1B Active Monopole Antenna 10kHz - 60 MHz

The active monopole antenna consists of a ground plane upon which are mounted

a preamplifier with internal rechargeable battery pack for battery operation, and a

telescoping rod antenna.

Operation: Mount the antenna on the tripod. Connect an external ground to the

ground plane if called out in test specification. Attach the telescoping rod to the

connector on the amplifier top and extend fully. Connect the output on amplifier

side to the receiver using a cable. Apply power to antenna (turn battery power 'on'.

The active monopole antenna is omni-directional.

MAGNETIC LOOP ANTENNA

SAS-560 Magnetic Loop Antenna 20 Hz - 2 MHz

The loop antenna does not require any assembly.

Operation: The loop antenna is designed to be held by hand and moved around

each surface if the EUT to measure magnetic radiation. Connect the antenna via a

cable to a receiver with either a 50 ohm input or high impedance (10 K ohm or

greater) input. Calibrations for both inputs are provided.

CURRENT PROBES

BCP-510 LF Current Probe 20 Hz - 1 MHz

BCP-511 HF/VHF Current Probe 100 kHz - 100 MHz

The current probes come ready for use.

Operation: The two current probes measure conducted emissions when clamped

around a single conductor, cable or a bundle of conductors. Disconnect the probe

latch Position the probe around the conductor and close the probe. Reconnect the

probe latch to ensure that the probe is tightly closed. Connect the probe connector

to the receiver with a cable. The probe calibrations supplied are into a 50-ohm

receiver.

TRIPOD AND MOUNTING ADPTERS

ATU-510 Tripod

AEH-510 Azimuth and Elevation Head

The azimuth and elevation head (AEH-510) mounts to the tripod (ATU-510) top

and allows the antennas to be rotated 360 degrees and tilted between horizontal

and vertical polarization. The tripod and azimuth and elevation head come in their

own carrying case. Each tripod leg is independently adjustable in angle and length

to facilitate antenna height setting. The tripod legs have a rubber tip on one end for

A.H. Systems AK-2G Antenna Kit

A.H. Systems inc. – January 2007

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indoor or hard surface use, and a metal spike on the other end for outdoor soft

surface (such as dirt) use.

TRANSIT STORAGE CASES

TCC-510 Tripod Carrying Case

TSC-542 Transit Storage Case

The antenna carrying case (TSC-542) prevents damage and loss of antennas

when storing or transporting the antenna kit. The case is constructed of lightweight

and durable polyethylene. Two case keys are provided with the case.

OPTIONAL EQUIPMENT

The AK-2G case comes with three additional cutouts for optional preamplifiers.

In order to improve overall system sensitivity, the following equipment will be

required:

 PAM-0202 with an SAC-213-0.5

PAM-0202 Preamplifier 20 MHz – 2 GHz

The preamplifier will increase the system sensitivity 30 dB and is recommend for

the SAS-510-2 and SAS-530,542. An optional short length cable (SAC-213-0.5), is

required to connect the preamplifier to any 50-ohm receiver or spectrum analyzer.

A.H. Systems AK-2G Antenna Kit

A.H. Systems inc. – January 2007

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ANTENNA FORMULAS AND CALCULATIONS

E-FIELD ANTENNAS

Add antenna factor plus cable loss to receiver reading in dBuV to convert to field

strength in dBuV/meter.

Field Strength(dBuV/m) = SA(dBuV) + AF(dB) + cable loss (dB)

LOOP ANTENNA

dBpT = dBuV + dBpT/uV + Cable Loss

dBuV/m = dBpT + 49.5 dB

BROADBAND CURRENT PROBES

A specific Transfer Impedance Factor is associated with each frequency. This number is

to be subtracted from the receiver reading in order to convert to dBuA

dBA = dBV (from Receiver) - Transfer Impedance (dB) - cable Loss (dB)

EXAMPLE:

Assume that the frequency of interest is 80 KHz and we need to find the current at this

frequency. Connect the probe per figure 1

Frequency: 80 KHz

Transfer Impedance: -2.76 dB ohms

Cable Loss: 0.1dB

Receiver Reading: -33.0dBuV

dBA = dBV (from Receiver) - Transfer Impedance (dB) - cable Loss (dB)

dBA= -33.0 - (-2.76) - - 0.1

dBA= -30.14

A.H. Systems AK-2G Antenna Kit

A.H. Systems inc. – January 2007

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MAINTENANCE

To ensure reliable and repeatable long-term performance, annual

re-calibration of your antennas, preamplifiers and current probes

by A.H. Systems experienced technicians is recommended. Our

staff can calibrate almost any type or brand of antenna.

For more information about our calibration services or to place an

order for antenna calibration visit our website at

http://www.AHSystems.com or call 1(818) 998-0223.

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