A.H. Systems AK-26G User manual

A.H. Systems AK-26G Antenna Kit
A.H. Systems inc. – January 2005
REV A 1
AK-26G
Antenna Kit
Operation Manual

A.H. Systems AK-26G Antenna Kit
A.H. Systems inc. – January 2005
REV A 2
TABLE OF CONTENTS
WARRANTY 3
INTRODUCTION 4
GENERAL INFORMATION 5
OPTIONAL EQUIPMENT 8
FORMULAS 9
MAINTENANCE 10

A.H. Systems AK-26G Antenna Kit
A.H. Systems inc. – January 2005
REV A 3
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-26G Antenna Kit
A.H. Systems inc. – January 2005
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INTRODUCTION
SPECIFICATIONS
Model Number Frequency Range Typical Correction 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
SAS-572 18 GHz – 26.5 GHz 36 to 38
BCP-510 20 Hz – 1 MHz -40 to –30
BCP-511 20 KHz – 100 MHz -1 to 1
SAC-26G-3 Up to 26.5 GHz 5.1 dB @ 26.5 GHz
ADP-202 N(f) to BNC(m)
Adapter
ADP-206 (qty 2) SMA(f) to N(m)
Adapter
OPTIONAL EQUIPMENT Typical
Gain / Attenuation
PAM-0126 0.1 GHz – 26 GHz 30 dB
SAC-26G-0.5 Up to 26.5 GHz 0.9 dB @ 26.5 GHz

A.H. Systems AK-26G Antenna Kit
A.H. Systems inc. – January 2005
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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-26G 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 spacing (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.

A.H. Systems AK-26G Antenna Kit
A.H. Systems inc. – January 2005
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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 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
SAS-572 Double Ridge Guide Horn Antennas 18 GHz – 26.5 GHz
The SAS-572 horn antenna comes assembled and ready to use. The
SAS-571 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 or SAC-26G-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

A.H. Systems AK-26G Antenna Kit
A.H. Systems inc. – January 2005
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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 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-26G case comes with three additional cutouts for optional
preamplifiers. In order to improve overall system sensitivity, the following
equipment will be required:

A.H. Systems AK-26G Antenna Kit
A.H. Systems inc. – January 2005
REV A 8
PAM-0126 with an SAC-26G-0.5
PAM-0126 Preamplifier 1 GHz – 26.5 GHz
The preamplifier will increase the system sensitivity 30 dB and is
recommend for the SAS-510-2, SAS-530,542 and SAS-571. An optional
short length cable (SAC-26G-0.5), is required to connect the preamplifier to
any 50-ohm receiver or spectrum analyzer.
SAC-26G-0.5 Low-Loss Cable up to 26.5 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-26G-0.5 has a typical
attenuation of 0.9 dB at 26.5GHz.

A.H. Systems AK-26G Antenna Kit
A.H. Systems inc. – January 2005
REV A 9
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-26G Antenna Kit
A.H. Systems inc. – January 2005
REV A 10
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.