A.H. Systems AK-18G Manual de usuario

A.H. Systems AK-18G Antenna Kit

©A.H. Systems inc. –May 2014

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AK-18G

Antenna Kit

Operation Manual

A.H. Systems AK-18G Antenna Kit

©A.H. Systems inc. –May 2014

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TABLE OF CONTENTS

WARRANTY

INTRODUCTION

GENERAL INFORMATION

OPTIONAL EQUIPMENT

FORMULAS

MAINTENANCE

A.H. Systems AK-18G Antenna Kit

©A.H. Systems inc. –May 2014

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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. Damage caused

by excessive signals at the product's input is not covered under the warranty. 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-18G Antenna Kit

©A.H. Systems inc. –May 2014

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INTRODUCTION

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

SAS-571

700 MHz –18 GHz

22 to 45

Transfer Impedance

BCP-610

20 Hz –20 MHz

-65 to –28

BCP-611

10 KHz –150 MHz

-25 to 5

Attenuation

SAC-18G-3

Up to 18 GHz

3.5 dB @ 18 GHz

OPTIONAL EQUIPMENT

Gain / Attenuation

PAM-0118

20 MHz –18 GHz

33 dB

SAC-18G-0.5

Up to 18 GHz

1.5 dB @ 18 GHz

A.H. Systems AK-18G Antenna Kit

©A.H. Systems inc. –May 2014

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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-18G 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 mounts 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-530,542 Broadband Dipole Antenna 160 MHz - 500 MHz

The broadband dipole antenna consists of the SAS-530,542 balun assembly and

two dipole (2" tubular) elements.

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

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

assembly. Connect a cable between the antenna connector and the receiver. The

broadband dipole beam pattern is similar to a dipole response.

A.H. Systems AK-18G Antenna Kit

©A.H. Systems inc. –May 2014

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SAS-542 Biconical Antenna 20 MHz - 330 MHz

The biconical antenna consists of the SAS-530,542 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

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.

SAS-571 Double Ridge Guide Horn Antenna 700MHz - 18 GHz

The horn antenna comes assembled and ready to use. The antenna mounting

bracket is attached to the antenna backwards in order to fit in the carrying case.

The bracket must be removed from the antenna, turned over (so that the bracket

leg faces away from the antenna), and re-attached to the antenna. (The bracket is

not needed for mounting if the tripod being used has an Azimuth/Elevation Head.)

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

the hole on the antenna bottom or the hole in the mounting bracket. The ridge

guides determine the antenna polarity: for horizontal polarity they should be

parallel to the ground, for vertical polarity they should be perpendicular to the

ground. Connect a cable between the antenna connector and the receiver. NOTE:

BE SURE TO USE A CABLE RATED FOR HIGH FREQUENCY WHEN

OPERATING ABOVE 5 GHz (for example, the SAC-18G-3).

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.

A.H. Systems AK-18G Antenna Kit

©A.H. Systems inc. –May 2014

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CURRENT PROBES

BCP-610 LF Current Probe 20 Hz - 20 MHz

BCP-611 HF/VHF Current Probe 10 kHz - 150 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

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-40G case comes with three additional cutouts for optional preamplifiers.

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

required:

•PAM-0118 with an SAC-18G-0.5

•PAM-1840 with an SAC-40G-0.5

PAM-0118P Preamplifier 20 MHz –18 GHz

The preamplifier will increase the system sensitivity 37 dB and is recommend for

the SAS-510-2, SAS-530,542 and SAS-571. An optional short length cable (SAC-

18G-0.5), is required to connect the preamplifier to any 50-ohm receiver or

spectrum analyzer.

A.H. Systems AK-18G Antenna Kit

©A.H. Systems inc. –May 2014

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SAC-18G-0.5 Low-Loss Cable up to 18 GHz

The Low-Loss, High Frequency cable is recommend for connecting the optional

preamplifier to any 50-ohm receiver or spectrum analyzer. Our Low-Loss High-

Frequency flexible cables are the preferred choice over standard cable types. With

improved power handling, low VSWR, and high frequency capabilities, the Low-

Loss cables can be made to your specified length and delivered in two days. The

1/2 meter SAC-18G-0.5 has a typical attenuation of 1.0 dB at 18GHz.

A.H. Systems AK-18G Antenna Kit

©A.H. Systems inc. –May 2014

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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/m) + 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-18G Antenna Kit

©A.H. Systems inc. –May 2014

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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.

Tabla de contenidos

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