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Agilent 85301B/C
Antenna Measurement Systems
45 MHz to 110 GHz
Configuration Guide
Discontinued Product Information
— For Support Reference Only —
Information herein, may refer to products/services no longer supported.
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Table of Contents
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32
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29
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35
13
14
19
10
10
12
13
6
7
8
4
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3
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Introduction
How to use this guide
General range parameters
Transmit site configuration
Range transfer function
Required measurement sensitivity
Selecting the system
85301B Antenna Measurement System
System configurations
Selecting the LO source
Reference signal level
Calculating reference power
Interconnect cables
RF cable ordering information
85301C Antenna Measurement System
IF interconnect cable
RF cables
Radiated reference signals
Reference phase-lock signal power level
Coupled reference signals
GPIB cables
GPIB extenders
Optional Capabilities
Manual antenna measurements
Measurement automation software
Millimeter-wave configuration
Multiple test channel configuration
Antenna positioning systems
Configuration Diagrams
General antenna range information
Transmit site configuration
85301B block diagram configuration
85301C block diagram configuration
Measurement automation
Millimeter-wave subsystem
Multiple-channel IF switching configuration
Multiple-channel RF switching configuration
Positioner configurations
Introduction
This Antenna Measurement Systems Configuration
Guide will help you configure a custom Agilent
Technologies 85301B or 85301C antenna measurement system that meets your measurement requirements. This guide is primarily for those customers who desire to design, integrate, and install their own antenna measurement systems using
Agilent antenna test instrumentation. The guide will lead you through all the steps. For the do-ityourself customer, this guide will assist you in determining what instrumentation to order from
Agilent Technologies. Your Agilent Technologies sales engineer will be glad to assist you in procuring the instrumentation. If desired, technical assistance is available from systems engineers who are experienced in configuring antenna measurement systems.
Some customers may prefer the design, integration, and installation of an antenna instrumentation subsystem be performed for them by a solution supplier who has extensive antenna configuration experience. Nearfield Systems, Inc. (NSI), an
Agilent Technologies channel partner, can provide this service. NSI will work with you to understand your measurement needs, and then design an RF subsystem that meets your requirements. In addition to system design and configuration, NSI provides system integration, on-site installation, and performance verification to ensure that the system delivered meets your requirements. NSI will provide a complete RF subsystem, reducing your risk, and eliminating the need for your personnel to design and configure a system.
Other customers may need an application solution: a complete system solution that addresses all aspects of a measurement application, such as a complete near-field or far-field measurement system. You may be designing, building, and testing antennas instead of an antenna measurement system. Agilent Technologies recommends Nearfield
Systems, Inc. for complete near-field and far-field application solutions. NSI has the measurement expertise to supply a complete system to meet your application requirement. NSI can configure and supply the RF subsystem, the positioning subsystem, provide the measurement application software, and provide system installation and training.
If you choose to use NSI’s services, you will not need to use this configuration guide; NSI will carefully consider all the issues covered in this configuration guide. Your Agilent sales engineer has a technical qualification guide that can be used to help define your measurement requirements, and he or she will be happy to work with you to define your requirements. Your sales engineer can also assist you in contacting NSI, or you can contact
NSI directly (California, USA) at (310) 518-4277,
FAX (310) 518-4279, by e-mail: [email protected], or visit their extensive website at www.nearfield.com.
Main parts of an antenna range
In general, an antenna range measurement system can be divided into two separate parts: the transmit site and the receive site (see Figure 1). The transmit site consists of the microwave transmit source, amplifiers, and the communications link to the receive site. The receive site consists of the receiver, LO source, RF downconverter, positioner, system software, and a computer.
TRANSMIT SITE
• Synthesized Sweeper
• Amplifers
RECEIVE SITE
• Receiver
• LO Source
• RF Downconverter
• Positioner
• Computer
Figure 1. Far-field antenna range
3
4
Configuration steps
Configuring an Agilent 85301B/C antenna measurement system involves the following steps. Each step is described in detail in this guide.
1. Select the transmit source, amplifiers, cables and method used to obtain the reference channel signal, and determine the minimum transmit power.
2. Determine the worst-case antenna range transfer function based on range length, maximum test frequency, and transmit antenna gain.
3. Calculate the estimated test channel power level based on transmit power, range transfer function, and expected test antenna gain.
4. Determine required measurement sensitivity based on test channel power level, required measurement dynamic range, and accuracy.
5. Select either an 85301B or 85301C antenna measurement system depending on range type and required microwave performance.
6. Configure the receive site.
7. Calculate the reference channel power level.
8. Review the complete configuration for accuracy and completeness.
9. You may wish to review the completed configuration with your Agilent Technologies sales representative and/or systems engineer, or with
Nearfield Systems, Inc.
How to use this guide
You can use Figures 16 through 25 at the end of this guide as worksheets for configuring your antenna measurement system. The bubble numbers value should be entered. These numbers correspond directly with the bubble numbers by the instructions in this guide. We recommend that you photocopy Figures 16 through 25 and fill them in as you go through the instructions.
General range parameters
1
Record the range type and length in Figure 16.
If a compact antenna test range (CATR) is to be used, record the manufacturer and model number.
Transmit site configuration
The following steps are required to configure the transmit site:
• Select the transmit source.
• Determine RF cable losses and transmit power based on range type.
• Decide how the reference channel signal will be obtained.
Transmit source selection
2
Record the required minimum and maximum test frequencies for the antenna range in Figure 17.
Based on these frequency requirements, select a transmit source from Table 1 below, check the model number in Figure 17, and record its maximum output power level at the upper test frequency on
Figure 17. Agilent recommends using only sources with front panel controls; this will allow diagnostics to be performed on the system if necessary.
The 1 Hz frequency resolution (Option 008) is recommended for both the RF and LO sources to allow the frequency resolution to be 1 Hz instead of 1 kHz. While most users desire a 1 Hz frequency resolution, it has the additional benefit of ensuring that the signal presented to the receiver is within its passband. If the system is to be used for measuring antennas in pulsed mode of operation, fast pulse modulation (Option 006) should be ordered.
Table 1. Agilent 85301B/C compatible transmit sources
Number Description Power (dBm)
83620B 10 MHz to 20 GHz synthesized sweeper with front panel controls.
Recommended options: Option 004, rear-panel RF output; Option 008,
1 Hz frequency resolution.
+13 dBm
83622B 2 GHz to 20 GHz synthesized sweeper with front panel controls.
Recommended options: Option 004, rear-panel RF output; Option 008,
1 Hz frequency resolution.
+13 dBm
83623B 10 MHz to 20 GHz synthesized sweeper with high output power and front panel controls.
Recommended options: Option 004, rear-panel RF output; Option 008,
1 Hz frequency resolution.
+17 dBm
83624B 2 GHz to 20 GHz synthesized sweeper with high output power and front panel controls.
Recommended options: Option 004, rear-panel RF output; Option 008,
1 Hz frequency resolution.
+20 dBm
83630B 10 MHz to 26.5 GHz synthesized <20 GHz, +13 dBm sweeper with front panel controls. (20 to 26.5 GHz,+10 dBm)
Recommended options: Option 004, rear-panel RF output; Option 008,
1 Hz frequency resolution.
83640B 10 MHz to 40 GHz synthesized <26.5 GHz, +10 dBm sweeper with front panel controls. (26.5 to 40 GHz, +6 dBm)
Recommended options: Option 004, rear-panel RF output; Option 008,
1 Hz frequency resolution.
83650B 10 MHz to 50 GHz synthesized <26.5 GHz, +10 dBm sweeper with front panel controls. 26.5 to 40 GHz, +5 dBm
Recommended options: Option 004, (40 to 50 GHz, +2.5 dBm) rear-panel RF output; Option 008,
1 Hz frequency resolution.
Frequency coverage above 50 GHz is available using the Agilent 83550 series millimeter-wave source modules. Source modules are available in R
(26.5 to 40 GHz), Q (33 to 50 GHz), U (40 to 60 GHz), V (50 to 75 GHz) and
W (75 to 110 GHz) bands. Refer to “Millimeter-wave configuration,” under
“Optional Capabilities.”
Transmit site RF cabling
The transmit site RF cabling will depend on the transmit amplifier and the method used to obtain the reference channel signal. The amplifier should be positioned as closely as possible to the transmit antenna to preserve maximum output power at the transmit antenna.
3
If no transmit amplifier is to be used, record
4
If a transmit amplifier is to be used, record the frequency range, gain and maximum output power of the transmit amplifier, as well as the length in meters of cables A2 and A3. For example, the frequency range of the Agilent 8349B microwave amplifier is 2 to 20 GHz with 14 dB of gain and
+20 dBm output power.
5
Record the nominal gain of the transmit antenna. If more than one antenna is used to cover the required frequency range, record the nominal gain of each antenna.
Agilent Technologies can also provide GPIB controllable switch matrices for remote switching of the transmit antennas.
Reference channel signals
Almost all outdoor ranges and some long indoor ranges obtain the reference channel signal using a stationary reference antenna to receive a portion of the radiated transmit signal. Shorter indoor ranges can often use a coupled reference signal to route the reference channel signal to the receiver using coaxial cable or waveguide.
5
6
6
If a coupled reference is chosen, one or more directional couplers must be chosen to cover the desired frequency range. Table 2 lists typical coupler parameters. To maximize transmit and reference channel power, select a coupler with the lowest coupling factor and insertion loss that matches the frequency range of the transmit antenna.
Broadband couplers (1 to 40 GHz) are also available with 16 dB coupling factors if sufficient power is available. Record the lengths of cables A4 and
A5 and the insertion loss and coupling factor of the directional coupler in Figure 17.
Table 2. Directional coupler data
Description
778D
87300B
87300C
87301D
87301E
Narda 4226-10
Narda 4202B-10
Narda 4203-10
Range (GHz)
0.1 to 2
1 to 20
1 to 26.5
1 to 40
2 to 50
0.5 to l8
1 to 12.4
2 to 18
Loss (dB)
2.0
1.5
1.3
2.0
0.6
1.5
1.7
1.9
Factor (dB)
10
10
10
10
20
10
10
13
Cable A4 should be kept as short as possible to preserve transmit power, and can be eliminated if the coupler can be connected directly to the transmit antenna.
Transmit power
7
From the parameters recorded in Figure 17, determine the power level at the input to the transmit antenna by subtracting the cable losses and adding amplifier gain to the output power level of the transmit source. Insertion loss curves for the
Agilent 85381 series cables are shown in Figures 12 and 13. Be careful to select a cable that will cover the desired frequency range. Use the maximum test frequency to determine the worst-case transmit power level.
Range transfer function
The range transfer function (P r
/P t
) of an antenna range determines the difference in power levels between the input to the transmit antenna and the output of an isotropic (0 dBi) antenna located at the receive site. This range transfer function
(which is a loss) is due to the dispersive nature of a transmitting antenna. A transmitting antenna radiates a spherical wavefront; only a portion of this spherical wavefront is captured by the receiving antenna.
For a free-space far-field range, this range transfer function is easily determined as follows:
P r
/P t
= G t
- (32.45 + 20*log (R) + 20*log (F)) where G t
= Transmit antenna gain (dBi)
R = Range length (meters)
F = Test frequency (GHz)
This equation does not account for atmospheric attenuation, which can be a significant factor in certain millimeter-wave frequency ranges.
Compact Antenna Test Ranges (CATRs) achieve greater transfer efficiency by collimating, or focusing the transmitted power using one or more shaped reflectors. Transfer functions for most
CATRs are available from the manufacturer's data sheet or on request. If the transfer function is unavailable, use the free-space transfer function as a worst-case estimate.
8
Record the transfer function in Figure 16 for the minimum and maximum test frequencies.
The test channel received power level, Pr (TEST), must be calculated to determine the approximate maximum power level present at the output of the antenna-under-test (AUT). The required measurement sensitivity is determined from the test channel received power level, the required dynamic range, and the required measurement accuracy.
The maximum test channel received power level will occur when the AUT is boresighted relative to the transmit antenna.
9
Record the estimated minimum boresight AUT gain, G (AUT), calculate the test channel received power level as follows and record it in Figures 16,
18, and 19.
P r
(TEST) = P t
+ P r
/P t
+ G (AUT) where P r
(TEST) = Test channel received power level (dBm)
P t
= Transmit power (dBm)
P r
/P t
= Range transfer function (dB, at the maximum test frequency)
G (AUT) = Expected minimum boresight gain of
AUT (dB)
Required measurement sensitivity
The required measurement sensitivity of the system is a function of measurement transmit power, range transfer function, AUT gain, required measurement dynamic range, and desired measurement accuracy. The previous steps have determined the approximate power level present at the output of the AUT under boresight conditions.
The measurement dynamic range required to test the AUT is the difference, in decibels, between boresight and the lowest AUT level that must be measured. Examples of these include side-lobe level, null depth, and cross-polarization levels.
10
Record the required dynamic range in Figure 16.
Measurement accuracy is also affected by the measurement sensitivity of the system. The signal-tonoise ratio will directly impact the measurement accuracy of the system for both amplitude and phase measurements. Figure 2 illustrates the relationship between signal-to-noise ratio and magnitude and phase errors.
Figure 2. Measurement accuracy as a function of signalto-noise ratio
11
Record the required signal-to-noise ratio in dB in Figure 16.
The overall system measurement sensitivity required is the test channel received power level minus the sum of the required dynamic range and signal-to-noise ratio.
12
Calculate the required measurement sensitivity by subtracting the required dynamic range and signal-to-noise ratio from the test channel received power level. Record the value in Figure 16.
The required measurement accuracy for lowlevel AUT responses is not always as stringent as the accuracy required for high-level AUT responses.
7
Selecting the system
Figure 3 will help you select either an Agilent
85301B or 85301C antenna measurement system, depending on your range type and the required microwave performance. If you select an 85301B system, you will configure the receive site with an
Indoor range
85310A distributed frequency converter (mixerbased). If you choose an 85301C system, you will configure the receive site with either an 8511A
(45 MHz to 26.5 GHz) or 8511B (45 MHz to 50 GHz) frequency converter (harmonic sampler-based).
System performance with these converters is shown in Tables 3 and 4.
Require measurements
>50 GHz now or in the future?
No
Need to measure signals
<-115 dBm (0.045 to 26.5 GHz) or
<-100 dBm (26.5 to 50 GHz)?
No
Require mixers at antenna-under-test?
No
*85301B can also be used; will provide greater sensitivity
Yes Yes Yes
Select 85301C system*
(uses 8511A/B frequency converter)
Outdoor range
Select 85301B system
(uses 85310A frequency converter)
Figure 3. Selecting an antenna measurement system
Table 3. Performance of an 85301B system (with 85310A distributed frequency converter)
85320A/B
Option H20 mixers 3
85320A/B standard mixers
Specification 0.1 to 3 GHz 1 to 2 GHz 1
Sensitivity 2 (dBm)
Compression level 4 (dBm)
Dynamic range 5
-107
-21
-80
-24
Channel isolation 6 (dB) 100 100
Typical RF input match (dB) 8 8
2 to 18 GHz 6 to 26.5 GHz
-113 -96
-24 -15
89 81
100 100
8 8
85320A/B
Option H50 mixers 3
2 to 18 GHz 6 to 26.5 GHz
-110
-24
86
100
5
-95
-27
68
100
5
Table 4. Performance of an 85301C system (with 8511A/B frequency converters)
Specification 0.045 to 8 GHz 8 to 20 GHz 20 to 26.5 GHz 26.5 to 40 GHz
Maximum output power 7 (dBm)
83630B 8
83650B 8
Sensitivity 2 (dBm) (S/N = 1,0 avgs), 8511A [B]
Sensitivity 2 (dBm) (S/N = 1,128 avgs), 8511A [B]
Dynamic range (dB, 0 averages) 8511A [B]
Compression level 4 (dBm)
Channel isolation 6 (dB, ref to test), 8511A [B]
Return loss (dB, RF input)
Min. phase-lock power 9 (dBm), 8511A [B]
+10
+10
-98
-119
88
-10
80 [85]
17
-40 [-41]
+10
+10
-98
-119
88
-10
80 [85]
15
-38[-39]
+3
+4
-94 [-89]
-115 [-110]
79 [74]
-15
80 [75]
9
-35 [-32]
—
+3
[-89]
[-110]
[74]
-15
[75]
9
[-32]
40 to 50 GHz
—
0
[-87]
[-108]
[68]
-19
[70]
7
[-30]
1. Performance from 1 to 2 GHz is typical.
2. Sensitivity is defined as signal = noise, IF bandwidth = 10 kHz. Averaging will improve sensitivity by 10 log (number of averages).
3. Typical performance.
4. RF level for 0.1 dB compression.
5. Broadband dynamic range is the measured difference between the compression level and the average noise floor. Achievable dynamic range for CW measurements is 2 to 3 dB better.
6. Channel isolation is the coherent RF leakage from the reference channel to the test channel.
7. Cable loss can be determined from Figures 12 and 13.
8. Frequency resolution for the 83630B and 83650B = 1 Hz. (with Option 008)
9. Minimum phase-lock power is the typical minimum RF power at the a1 or a2 input to achieve phase-lock.
8
The following factors should also be considered when choosing your system:
• The 85310A distributed frequency converter
(85301B system) allows the test mixer to be located at the AUT, avoiding the degradation in measurement sensitivity due to cable insertion loss between the 8511A/B RF inputs and the
AUT.
• Measurement sensitivity and acquisition time are directly related. If averaging is used to achieve the required measurement sensitivity, data acquisition times will be increased.
Averaging will improve sensitivity by 10*log
(Averaging Factor) until limited by channel-tochannel isolation. The increase in acquisition time can be determined by multiplying the averaging factor by 200 microseconds. If acquisition time is critical, fundamental mixing using the
85310A will reduce or eliminate the need for averaging.
• If the distance between the 8530A and the AUT is large, both the LO source and the 85310A frequency converter can be remoted from the
8530A. Remote distances of up to 25 meters cause no degradation in system sensitivity; beyond 25 meters, the system sensitivity degrades by 0.1 dB per meter.
The 85301C antenna measurement system utilizes an 8511A/B frequency downconverter which uses a harmonic sampling technique with a built-in voltage-tuned oscillator. This type of downconversion does not require a second synthesized source as a local oscillator, so it will be a lower-cost RF system.
The 85301C system has a low-frequency limit of
45 MHz; the 85301B has a low-frequency limit of
100 MHz.
The 85301B system utilizes mixers for frequency downconversion. While these mixers are relatively broadband, they are banded. Mixers are available for the frequency bands of 100 MHz to 3 GHz, 1 to
26.5 GHz, 2 to 50 GHz, 40 to 60 GHz, 50 to 75 GHz, and 75 to 110 GHz.
The 85301C system provides broadband frequency downconversion: either 45 MHz to 26.5 GHz, or
45 MHz to 50 GHz coverage.
9
Agilent 85301B Antenna Measurement System
The Agilent 85301B antenna measurement system uses the Agilent 85310A distributed frequency converter to downconvert the microwave signal to an
IF frequency that can be measured by the receiver.
The 85310A distributed frequency converter is based on an external mixer configuration and consists of the 85309A LO/IF distribution unit,
85320A test mixer module, 85320B reference mixer module and accessories. When combined with an appropriate LO source, the 85310A provides fundamental downconversion from 2 to 18 GHz and third harmonic downconversion from 6 to 26.5 GHz
(see Figure 4). The frequency coverage can be extended to 110 GHz by the 85325 millimeter-wave subsystems, which are discussed under “Millimeterwave configuration.” The 85310A is a single-channel downconverter (one test and one reference).
A second test channel can be added by ordering
85310A Option 00l. For two additional test channels
(a total of one reference channel and three test channels), order Option 002.
The 85309A LO/IF distribution unit provides
LO signal amplification and isolation, IF preamplification and filtering, and an LO/IF diplexer for the test channel. The 85320A test mixer module contains an LO/IF diplexer, double-balanced mixer and a 3 dB matching pad on the RF port. The 85320B reference mixer module contains a directional coupler, leveling detector, double-balanced mixer and a 3 dB matching pad on the RF port. An adapter cable for IF connections between the 85309A and the
8530A is included with the 85310A as well as 3 dB and 6 dB fixed attenuators.
A leveling detector in the reference mixer is used to provide the proper LO drive to the mixers. It is important to use equal length cables to both the reference and test mixers to ensure the same cable loss, and provide the same LO drive power to both mixers.
RF In
3.5 mm male
85302B
Reference
Mixer
Module
REF LO In DET Out
REF IF Out
8530A
REF IF In (A1)
TEST IF In (B2)
85320A
Test Mixer
Module
RF In
3.5 mm male
EXT LVL In
REF IF In
REF LO Out
LO In
IF Out
REF IF Out
TEST IF Out
Positive Z
Blank
85309A
LO/IF Unit
LO
Input
LO Out
IF In
Z-axis
RF
Out
LO Source
Figure 4. Interconnect diagram of an 85310A distributed frequency converter
Weatherproof enclosures
If the 85309A LO/IF unit and/or the LO source are to be located outdoors, the units must be protected from inclement weather.
System configurations
Figures 5 through 8 illustrate several common range configurations in which an 85310A frequency converter would be used. Figure 5 represents the most common outdoor configuration, where the receiver and LO source are located in the control room, the 85309A LO/IF unit is located close to the antenna positioner and the mixer modules are connected directly to the reference and test antennas.
If the distance between the LO source and the
85309A exceeds the maximum LO cable lengths, a synthesized LO source can be remoted with the
85309A using 37204A GPIB extenders (see “GPIB extenders”). Remoting the 85309A LO/IF distribution unit up to 25 meters from the 8530A causes no degradation in system sensitivity; beyond
25 meters, the system sensitivity degrades by
0.1 dB per meter.
10
In Figure 6, the transmit source and 8530A are located in the control room and a synthesized LO source, 85310A frequency converter and GPIB extender are located on the rail cart with the positioning system and AUT. The GPIB extender cable, together with coaxial cables transmitting the reference and test IF signals, are fed from a spool mounted on the rail cart.
AUT
85320A
Test Mixer
Module
85309A
LO/IF Unit
Reference
Antenna
85320B
Reference
Mixer
Module
Control
Room
8530A
LO Source (83620B)
Figure 5. Typical outdoor far-field antenna range configuration
Transmit
Antenna
Control Room
8360
RF Source
37204A
Reference
Antenna
85320B
Reference
Mixer
Module
AUT
Rail Cart
8530A
85320A
Test Mixer
Module
LO Source
37204A
85309A LO/IF Unit
Figure 6. Outdoor range configuration using rail cart
11
In Figure 7, the range uses a single-reflector CATR to collimate the transmit beam to a plane wave.
In this case, the transmit source, LO source, the
85309A LO/IF unit and GPIB extender are located in the positioner/feed pit. The 8530A, positioner controller and computer system are located in the control room.
Antenna
Under Test
Reflector
85320A
Test
Mixer
Module
Transmit
Feed
Positioner
Pit
85320B
Reference
Mixer Module
RF Source
85309A
LO/IF Unit
37204A
GPIB
Extender
LO Source
Reference and
Test IF Signals
GPIB Extender
Cable
To Control
Room
Figure 7. Indoor range using single-reflector CATR
A dual-reflector CATR range is configured slightly differently (Figure 8). The transmit source is located in the control room with the 8530A. If the reference mixer module will not reach the transmit source due to cable length restrictions, the coupled reference signal can be routed to the reference mixer module using coaxial cable.
Antenna
Under
Test
Subreflector
Reflector
85320A
Test Mixer
Module
Positioner
Pit
37404A
GPIB
Extender
LO Source
Transmit
Feed
85320B
Reference
Mixer
37204A
GPIB
Extender
RF Source
8530A
Control
Room
85309A
LO/IF Unit
Figure 8. Indoor range using dual-reflector CATR
In all configurations, the cable lengths between the
85309A LO/IF distribution unit and the reference and test mixers should be the same length. Mixer power level is adjusted and leveled at the reference mixer; using the same cable lengths for the test mixer insures proper LO drive power to the test mixer.
Selecting the LO Source
The 85301B antenna measurement system uses synthesized RF and LO sources. Since the RF and
LO signals are synthesized, phase lock for the receiver is unnecessary. Microwave mixers used with the 85301B antenna measurement system use fundamental mixing from 100 MHz to 18 GHz, and harmonic mixing for frequencies above 18 GHz.
Thus, an LO source that operates over the frequency range of 0.1 to 18 GHz will be adequate for all frequencies of operation of the 85301B. A large selection of synthesized sources is available for LO sources (refer to Table 1). However, because the
LO source only needs to operate over the frequency range of 0.1 to 18 GHz, LO source selection can be limited to the synthesizers shown in Table 5.
Table 5. Agilent 85301B LO sources
Model Output
Number Description Power (dBm)
83620B 10 MHz to 20 GHz synthesized sweeper with + 13 dBm front panel controls.
Recommended Options: Option 004, rear-panel
RF output; Option 008, 1 Hz frequency resolution.
83622B 2 GHz to 20 GHz synthesized sweeper with front panel controls.
Recommended Options: Option 004, rear-panel
RF output; Option 008, 1 Hz frequency resolution.
+13 dBm
83623B 10 MHz to 20 GHz synthesized sweeper with +17 dBm high output power, and front panel controls
Recommended Options: Option 004, rear-panel
RF output; Option 008, 1 Hz frequency resolution.
83624B 2 GHz to 20 GHz synthesized sweeper with high output power, and front panel controls.
Recommended Options: Option 004, rear-panel
RF output; Option 008, 1 Hz frequency resolution.
+20 dBm
12
Select a source that meets your individual preferences and needs. The higher-output power sources are useful when the distance between the LO source and the 85309A LO/IF, distribution unit is longer than the standard allowable cable lengths shown in Tables 6 through 11. By using the cable insertion loss curves (Figures 12 and 13) the additional cable length can be calculated for the higher-output power sources. The 1 Hz frequency resolution
(Option 008) is recommended for both the RF and
LO sources to provide a system frequency resolution of 1 Hz instead of 1 kHz.
Reference signal level
The reference mixer provides a phase reference for the measurement, and a reference signal for a ratioed measurement (b2/a1) to ratio out any variations in signal levels from the system. Since both the RF and LO sources are synthesized, phase locking the receiver is not required. The only requirement for the reference channel is that the signal level be high enough to achieve the desired accuracy for the measurement. Figure 2 shows the magnitude and phase errors as a function of signalto-noise ratio; this also applies to errors contributed by the reference channel. For most applications, it is desirable to maintain a 50 to 60 dB signal-tonoise ratio. For fundamental mixing (2 to 18 GHz), the sensitivity is -113 dBm; maintaining a 50 to 70 dB signal-to-noise ratio would require a reference channel signal level of -40 to -60 dBm.
13
Record the model number of the selected LO source in Figure 18.
Calculating reference power
Calculation of the reference channel power level depends on the method used to obtain the reference signal. Use the sections below to determine the reference channel power level for either a radiated reference signal or a coupled reference signal.
Radiated reference signals
When using a radiated reference, the reference channel power level can be determined from the following equation:
P r
(REF) = P t
+ P r
/P t
+ G (REF) where P r
(REF) = Power level at the output of the reference antenna
P t
= Transmit power level (dBm)
P r
/P t
= Transfer function of the range
G (REF) = Gain of the reference antenna
14
Record the reference antenna gain in Figure 18.
15
Record the calculated reference channel power level Pr (REF) in Figure 18.
If the calculated reference channel power level is insufficient to achieve the desired accuracy from the reference channel, the transmit power or the reference antenna gain must be increased.
Coupled reference signals
When using a coupled reference, the reference channel power level can be determined by subtracting the cable insertion losses and the coupling factor of the directional coupler and adding amplifier gain, if any, to the output power of the transmit source. Insertion loss curves for 85381 series cables are shown in Figures 12 and 13.
16
Record the calculated reference channel power level Pr (REF) in Figure 18.
13
Interconnect cables
The Agilent 85310A frequency converter requires coax cables for routing LO, IF and DC leveling signals between the 85309A LO/IF unit, 8530A, mixer modules and the LO source. Agilent Technologies has several different types of cables available to meet these cabling needs. They are described below.
Output power of LO/IF distribution unit
Mixers require a certain LO drive power level; the output power of the 85309A LO/IF distribution unit and the RF loss of the cables will determine the maximum allowable cable lengths. The cable length tables and power level diagrams shown in this configuration guide are based on the standard
85309A specifications.
Higher-output power LO/IF distribution units
Agilent Technologies also offers the 85309A with special options for higher output power. When designing a system with a special high-power unit, verify the output power specifications, and make adjustments to cable lengths based on the power level. Cable lengths shown in Figures 9–11 and 15, and Tables 6–11 and 14–15 are calculated from the following formulas:
Cable L1 length (meters) = (P
OUT source - P
IN
85309A)
/(cable loss/meter @frequency)
Cable L2 length (meters) = (P
OUT
85309A - P
IN mixer)
/(cable loss/meter @frequency)
The cable length tables that follow show cable lengths in parentheses for the 85309A Special
Option H30, H31, and H32, which are the most popular higher-power specials. These specials have the following minimum specified leveled power: 0.3
to 0.5 GHz, 25 dBm; 0.5 to 8.4 GHz, 27 dBm; 8.4 to
18 GHz, 24.5 dBm. Minimum specified leveled power over 0.3 to 18 GHz is 24.5 dBm.
Fundamental versus harmonic mixing
Loss of LO cables is dependent on RF frequencies; lower frequencies have lower loss per unit length, and higher frequencies have higher loss (refer to
Figures 12 and 13). Therefore the maximum LO frequency utilized will affect the maximum length of the cables. The maximum LO frequency is dependent on the frequency specified for the antenna range and whether fundamental or harmonic mixing is used. Lower LO frequencies have less loss and allow longer cable lengths; higher LO frequencies have higher losses, so cable lengths are shorter. There is a trade-off between LO frequency and system sensitivity. Fundamental mixing provides the lowest conversion loss in the mixer, and the best system sensitivity. Harmonic mixing allows lower LO frequencies to be used (with longer cable lengths), but has higher conversion loss in the mixer, and less system sensitivity.
Standard versus low-loss cables
The RF loss of the cables will affect the maximum length of cable that can be used between the 85309A and the mixers. The standard 85381A/C/D cables have losses as shown in Figures 12 and 13. Special low-loss cables, such as the MA/COM FA29RX cable, are about half the loss of the standard cables. Therefore the low-loss cables will provide approximately twice the distance between the
85309A and the mixers. The trade-off is higher price and somewhat less durability. MA/COM can be contacted at (800) 366-2266, FAX (800) 618-8883, or visit their website at www.macom.com. Other cable manufacturers, such as W.L. Gore &
Associates, may have similar low-loss cables that would be satisfactory in this application. W.L. Gore
& Associates can be contacted at (800) 445-4673, or visit their website at www.gore.com.
14
The following figures and tables define the allowable cable lengths between the LO source and
85309A LO/IF distribution unit, and between the
85309A and the mixers. Tables 6, 8, and 10 show maximum cable lengths with standard 85301A/C cables. Tables 7, 9, and 11 show maximum cable lengths with MA/COM FA29RX low-loss cables.
Maximum cable lengths with 1 to 26.5 GHz mixers
The standard mixers used in Agilent antenna measurement systems are the 85320A test mixer and the 85320B reference mixer. Both mixers operate from 1 to 18 GHz in fundamental mode, and from 6 to 26.5 GHz in third-harmonic mode. While the 85320A/B mixers are not specified from 1 to
2 GHz, they will operate in this frequency range with degraded sensitivity. Figure 9 shows the RF power levels required for proper operation with the
85320A/B mixers. Table 6 shows the maximum allowed 85381A/C cable lengths from the LO source to the 85309A, and from the 85309A to the 85320A/B test and reference mixer modules. Table 7 shows the maximum cable lengths with special low-loss cables.
85320B
Reference
Mixer
83620B
Synthesized Source
85309A LO/IF
Distribution Unit
POut = 19 dBm*
Cable Length L2
P
In
= 7.5 dBm
85320A
Test Mixer
POut = 13 dBm
Cable Length L1
P
In
= 0-5 dBm
POut = 19 dBm*
Cable Length L2
PIn = 7.5 dBm
*Minimum specified leveled power; 2-9 GHz, POut = 20.4 dBm; 9-18 GHz, POut = 19 dBm.
Figure 9. Required RF power levels for 85320A/B mixers
Table 6. 85381A cable lengths with 85320A/B mixers
Maximum LO Frequency Maximum cable length (L1,meters) Maximum cable length (L2,meters) bands (GHz) LO source to 85309A 85309A to 85320A/B
18 5 (5) 1 7 (12) 1
12.4
9
6
3.6
7 (6.2) 1
10 (7.4) 1
13 (9.2) 1
27 (11.5) 1
9 (15.3) 1
12 (18) 1
15 (22.5) 1
29 (28) 1
Operating bands
1 to 18 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 12.4 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 9 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 6 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 3.6 GHz fundamental
3.6 to 18 GHz 5th harmonic
Table 7. Special low-loss cable lengths with 85320A/B mixers, and MA/COM FA29RX cable
Maximum LO Frequency Maximum cable length (L1,meters) Maximum cable length (L2,meters) bands (GHz) LO source to 85309A 85309A to 85320A/B Operating bands
18 10 (10) 1 15 (25.9) 1
12.4
9
6
12 (13) 1
15 (15) 1
20 (19) 1
19 (32) 1
24 (38) 1
31 (47) 1
1 to 18 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 12.4 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 9 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1 to 6 GHz fundamental
6 to 26.5 GHz 3rd harmonic
1. Maximum cable lengths with special high-powered 85309A-H30, H31, H32 units.
15
Maximum cable lengths with 2 to 50 GHz mixers
Agilent Technologies offers 85320A/B Option H50 mixers that operate from 2 to 50 GHz with a single
2.4-mm coaxial connector at the RF input port.
These mixers are popular when operation above
26.5 GHz is required. The 85320A-H50 test mixer and the 85320B-H50 reference mixer operate from
2 to 18 GHz in fundamental mode, and from 6 to
50 GHz in third-harmonic mode.
Figure 10 shows the RF power levels required for proper operation with the 85320A/B Option H50 mixers. Table 8 shows the allowed 85381A/C cable lengths from the LO source to the 85309A, and from the 85309A to the 85320A/B-H50 test and reference mixer modules. Table 9 shows the cable lengths with special low-loss cables.
83620B
Synthesized Source
POut = 13 dBm
Cable Length L1
85309A LO/IF
Distribution Unit
POut = 19 dBm
Cable Length L2
85320B-H50
Reference
Mixer
P
In
= 12 dBm
85320A-H50
Test Mixer
P
In
= 0-5 dBm
POut = 19 dBm
Cable Length L2
PIn = 12 dBm
Figure 10. Required RF power levels for Agilent
85320A/B-H50 mixers
Table 8. 85381A cable lengths with 85320A/B-H50 mixers
Maximum LO Frequency Maximum cable length (L1,meters) Maximum cable length (L2,meters) bands (GHz) LO source to 85309A 85309A to 85320A/B
18 5 (5) 1 5 (8.9) 1
16.7
13.3
9.5 (5) 1
7 (6) 1
5 (9.3) 1
6 (10) 1
Operating bands
2 to 18 GHz fundamental
18 to 50 GHz 3rd harmonic
2 to 16.7 GHz fundamental
16.7 to 50 GHz 3rd harmonic
2 to 13.3 GHz fundamental
13.3 to 40 GHz 3rd harmonic
Table 9. Special low-loss cable lengths with 85320A/B-H50 mixers, and MA/COM FA29RX cable
Maximum LO Frequency Maximum cable length (L1,meters) Maximum cable length (L2,meters) bands (GHz) LO source to 85309A 85309A to 85320A/B Operating bands
18 10 (10.5) 1 10 (19) 1
16.7
13.3
11 (11.6) 1
13 (12.7) 1
11 (21) 1
12.4 (22.8) 1
2 to 18 GHz fundamental
18 to 50 GHz 3rd harmonic
2 to 16.7 GHz fundamental
6.7 to 50 GHz 3rd harmonic
2 to 13.3 GHz fundamental
13.3 to 40 GHz 3rd harmonic
1. Maximum cable lengths with special high-powered 85309A-H30, H31, H32 units.
16
Maximum cable lengths with low-frequency mixers
Agilent Technologies offers 85320A/B Option H20 mixers that operate from 0.1 to 3 GHz. These mixers are popular when operation below 2 GHz is required. The 85320A-H20 test mixer and the
85320B-H20 reference mixer operate from 0.1 to
3 GHz in fundamental mode.
A standard 85309A LO/IF distribution unit operates over the frequency range of 1 to
26.5 GHz with standard 85320A/B mixers. It also operates over the frequency range of 0.3 to 3 GHz with 85320A/B Option H20 mixers, and over the range of 2 to 50 GHz with
85320A/B Option H50 mixers. Measurement capability over the frequency range of 0.1 to
0.3 GHz requires an 85309A configured with
Special Option H20.
Figure 11 shows the RF power levels required for proper operation with the 85320A/B-H20 mixers.
Table 10 shows the allowed 85381A/C Cable lengths from the LO source to the 85309A, and from the 85309A to the 85320A/B-H20 test and reference mixer modules. Table 11 shows the cable lengths with special low-loss cables.
83620B
Synthesized Source
85309A LO/IF
Distribution Unit
POut = 16 dBm
Cable Length L2
85320B-H20
Reference
Mixer
PIn = 8 dBm
85320A-H20
Test Mixer
POut = 13 dBm
P
In
= 6-10 dBm
POut = 16 dBm
Cable Length L1
Cable Length L2
PIn = 8 dBm
Figure 11. Required RF power levels for 85320A/B-H20 mixers
Table 10. 85381A cable lengths with 85320A/B-H20 mixers
Maximum LO Frequency Maximum cable length (L1,meters) Maximum cable length (L2,meters) bands (GHz) LO source to 85309A 85309A to 85320A/B
3 11 (13.8) 1 13.8 (37.8) 1
Operating bands
System
Sensitivity (dBm)
0.1 to 3 GHz fundamental -107
Table 11. Special low-loss cable lengths with 85320A/B-H20 mixers, and MA/COM FA29RX cable
Maximum LO Frequency Maximum cable length (L1,meters) Maximum cable length (L2,meters) bands (GHz) LO source to 85309A 85309A to 85320A/B
3 20 (22) 1 29.5 (61) 1
Operating bands
System
Sensitivity (dBm)
0.1 to 3 GHz fundamental -107
1. Maximum cable lengths with special high-powered 85309A-H20, H31, H32 units
17
Agilent 85381 series coaxial cables
The 85381A microwave cable is a semi-flexible cable that operates from DC to 18 GHz. It is intended for use as an LO cable between the LO source and the 85309A LO/IF unit (see Figure 11).
If a rotary joint is used to route the test LO and IF signals so that the cable is not continuously flexed, the 85381A cable can be used between the 85309A and the 85320A/B test and reference mixers. The maximum orderable length for this cable is 25 meters. (See Figure 18, cables B3, B4 and B5.)
Refer to Figure 12 for cable loss characteristics.
The 85381C microwave cable is a flexible cable that operates from DC to 26.5 GHz. It is intended for use as a transmit site RF cable, and to connect the output of the AUT to the mixer modules when direct connection is not possible. The 85381C can also be used as a flexible LO cable in non-rotary joint applications where the 85381A proves unsuitable (see cable B2 in Figure 18). Maximum orderable cable length is 30 meters.
The 85381D cable is a flexible microwave cable that operates from DC to 50 GHz. It is intended for use in 50 GHz systems. It is used to connect the transmit source to the source antenna, and on the
AUT side of the antenna range to connect the AUT to the 50 GHz test mixer. Maximum orderable cable length is 10 meters. This cable has significantly higher loss than the 85381A/C cables, and should only be used when 50 GHz capability is required.
Refer to Figure 13 for cable loss characteristics.
The 85382A cable is a low-frequency (<100 MHz) flexible cable. It is used to carry the 20 MHz signal from the 85309A frequency converter to the 8530A microwave receiver. This cable is also used to tie the 10 MHz time bases of the RF and LO sources together in applications where this is practical.
This cable can be ordered in lengths up to 200 meters.
2.0
1.5
1.0
0.5
0.61
85381A
85381C
0.46
0.30
MA/COM FA29RX
0.15
0
0 5 10 15
Frequency (GHz)
20
Figure 12. Insertion loss for 85381 series cables
25
0
6.0
5.5
5.0
4.5
4.0
3.5
85381D
50 GHz
3.0
2.5
2.0
1.5
1.0
85381A
18 GHz
85381C
26.5 GHz
.5
0
0 5 10 15 20 25 30 35 40 45 50
0
Frequency (GHz)
Figure 13. 85381A/C/D cables; typical insertion loss
0.46
0.30
0.15
1.23
1.07
0.91
0.76
0.61
1.79
1.64
1.53
1.38
18
RF cable ordering information
Cable length
Determine the type and length (in meters) of cable required. Order the cable by type (85381A, C, D or
85382A) and length option Cxx, where ‘xx’ specifies the length of the cable in meters. To order a one-half meter cable, specify Option C00. To convert feet to meters, multiply the number of feet by
0.3048.
Ordering example: To order a 23-foot cable for use up to 26.5 GHz, order 85381C Option C07 (23 feet x 0.305 = 7 meters).
Cable connectors
A variety of connector types are available for the
85381A/C/D and 85382A RF cables, as shown in
Table 12. Two connector options must be ordered for each cable.
Table 12. RF cable connector options
Cable Type
Connector 85381A 1
Type
85381C 1 85381D 1 85382A 1
DC to 18 GHz DC to 26.5 GHz DC to 50 GHz DC to 100 MHz
Type-N male
Type-N female
CNM CNM
CNF 2
2 CNM
3.5 mm male
3.5 mm female
SMA male
SMA female
CSM
C3M
C3F
CSM
CSF 2
2
BNC male
BNC female
2.4 mm male
2.4 mm female
C2M
C2F
CBM
CBF
1. Minimum bend radii for cables are as follows: 85381A/C/D, 5 cm (2 inches);
85382A, 6 cm (2.5 inches).
2. Maximum frequency is 18 GHz.
Cable ordering example:
To obtain a 23-foot cable for use up to 18 GHz with a Type-N male connector on one end and an SMA male connector on the other end, order an 85381A
Option C07, CNM, CSM. To get a 9-meter cable for use up to 26.5 GHz with 3.5-mm male connectors on each end, order an 85381C Option C09, C3M,
C3M.
Reference and test LO cables
The same LO cable type and length is required for both the reference and test mixer modules. This is to ensure that the insertion losses through the reference and test mixer module LO paths are the same. Using the same LO cable type also optimizes cable phase tracking versus temperature and, therefore, system phase measurement, stability, and accuracy.
Remote LO source
If the maximum cable distance between the LO source and the 85309A LO/IF unit is insufficient, a synthesized LO source may be remoted with the
85309A using 37204A GPIB extenders. Remote distances of up to 25 meters cause no degradation in system sensitivity; beyond 25 meters, the system sensitivity degrades by 0.1 dB per meter. System sensitivity degradation is due to IF cable loss in the 20 MHz IF cables connecting the 85309A to the
8530A.
19
Rotary joints
When a rotary joint is used, the equivalent cable length must be added to the reference mixer LO cable due to the rotary joint insertion loss. To determine the equivalent cable length, first determine the insertion loss from the input to the output of the rotary joint at the maximum LO frequency.
17
Record this value in Figure 18. Then use
Figure 12 or 13 to calculate the equivalent length in meters at the maximum LO frequency using the same cable type used for the LO cables between the 85309A and the mixer modules. The reference
LO cable length must be increased by this amount.
18
Record the lengths and type of the LO cables
(B1 through B5) in Figure 18.
19
Record the lengths and type of the IF and leveling cables (C1 through C5) in Figure 18.
Normally, 85382A cable is used.
20
In Figure 16, record the connector types of the system components.
The semi-flexible 85381A cable is normally used for cables B1, B3, B4, and B5. The flexible 85381C cable is normally used for cables B2 and B5. The
85382A cable is normally used for cables C1, C2,
C3, C4, and C5.
20
Agilent 85301C Antenna Measurement System
The Agilent 85301C antenna measurement system uses either an 8511A (45 MHz to 26.5 GHz) or an
8511B (45 MHz to 50 GHz) frequency converter for downconversion. 85381A/C microwave cables are used to route the microwave signal from the antenna under test to the 8511A/B frequency downconverter.
IF interconnect cable
The 8511A/B should be located as closely as possible to the test antenna to minimize the RF cable lengths. Several IF interconnect cables are available up to 21 meters (70 feet) to allow remoting of the 8511A/B away from the 8530A, and close to the antenna under test. Also, coupled reference cables are often run through conduit under the range floor to the positioner pit to minimize these lengths.
21
Determine the cable length from the 8530A to the 8511A/B and check one of the IF interconnect cable lengths in Figure 19.
RF cables
22
Determine the lengths of the RF cable(s)
(cables B1 or B2 and B3) used to connect the AUT to the frequency converter and record them in
Figure 19. Select the cable type (see Figures 12 and
13) based on the maximum test frequency.
The 85381C flexible cable is usually used for cable
B1. For cables B2, B3, and B4, either the 85381C flexible or 85381A semi-flexible cable can be used.
The measurement sensitivity of the 8511A/B must be degraded by the insertion loss of the
RF cable(s) to determine system measurement sensitivity.
Radiated reference signals
23
If a radiated reference is used, determine the length of cable B4 and record it in Figure 19.
24
In Figure 16, record the connector types of the system components.
Reference phase-lock signal power level
It is important to ensure that sufficient reference phase-lock power is available at the reference input to the 8511A/B. The minimum reference phaselock power levels are listed in Table 4.
Calculation of the reference channel power level depends on the method used to obtain the reference signal. Use the sections below to determine the reference channel power level for either a radiated reference signal or a coupled reference signal.
When using a radiated reference, the reference phase-lock power level can be determined from the following equation.
P r
(REF) = P t
+ P r
/P t
+ G (REF) - B4 where P r
(REF) = Power level at the input of the 8511A/B
P t
= Transmit power level (dBm)
P r
/P t
= Transfer function of the range
G (REF) = Gain of the reference antenna
B4 = Insertion loss of cable B4
25
Record the reference antenna gain in Figure 19.
21
Coupled reference signals
When using a coupled reference, the reference phase-lock power level can be determined by subtracting the cable insertion losses and the coupling factor of the directional coupler and adding amplifier gain, if any, to the output power of the transmit source. Insertion loss curves for 85381 series cables are shown in Figures 12 and 13.
If a coupled reference is used, the A5 cable can be connected directly to the reference input of the 8511A/B.
26
Record the calculated value in Figure 19. If the power level is insufficient, increasing the transmit power and/or decreasing the coupling factor of the directional coupler may provide the additional power required.
GPIB cables
A GPIB cable between the 8530A and the 8511A/B is required only if Option 001 (IF switching) is installed in the 8511A/B. In this case, the maximum separation distance between the 8530A and the 8511A/B is 12 meters (40 feet).
GPIB extenders are used to facilitate communication between the 8530A and the transmit source.
37204A GPIB extenders can support distances of up to 250 meters (820 feet) using 75-ohm coaxial cable and up to 2,500 meters (8,200 feet) using
37204A Option 013 and fiber-optic cable.
For extremely long ranges, telephone line modems can be used in conjunction with a leased telephone line to provide communications between the transmit site and the receive site.
When configuring systems with a telephone line link to the RF source, Agilent recommends an ICS
Electronics IEEE-488 to RS-232 converter and a
Hayes Smartmodem 9600 telephone line modem at each end of the telephone line. For more information on these products, contact the manufacturers:
ICS Electronics model 4886B-H
(408) 263-5500 www.icselect.com
Hayes Smartmodem 9600
Hayes Microcomputer Products, Inc.
(770) 441-1617 www.hayes.com
GPIB extenders
GPIB extenders are also used when remoting the
LO source with the 85309A LO/IF unit. 37204A
GPIB extenders can be used for this purpose. If the
37204A is also used for communications with the transmit source, only three extenders are required.
Extenders must be used in slow mode.
The cable type must be the same between all three extenders.
22
Optional Capabilities
Manual antenna measurements
The 85301B/C antenna measurement systems can be operated in a manual mode. Manual operation allows the operator to rotate the antenna under test, and measure, analyze, print and archive the pattern manually. As the antenna under test is rotated, the antenna pattern is displayed on the color display of the microwave receiver. Up to five interactive markers can be placed on the pattern, indicating angular position and amplitude (or phase) value. For a hard copy of the antenna pattern, the receiver can print the pattern to a variety of HP printers. For archive purposes, antenna patterns can be stored by the receiver via a built-in
3.5” disk drive in either DOS or LIF format.
The 85370A antenna position encoder allows manual antenna patterns to be measured easily using the 8530A microwave receiver and any antenna position system. The antenna positioner encoder provides positioner information to the 8530A microwave receiver. The encoder monitors the synchro lines from the antenna positioner, decodes the synchro signals and sends the positioning information to the receiver through an encoder interface cable. When the positioner is manually moved through the desired angles, the receiver measures and displays the antenna pattern on the screen display of the receiver. Antenna pattern parameters such as start and stop angles, as well
8530A
Microwave Receiver
8530A
Option 005
Encoder Interface
Encoder Interface Cable as angular sampling increment, can be selected from the front panel of the microwave receiver.
Synchro encoder operation is not compatible with pulsed operation.
27
If manual operation capability is desired, select the 85370A antenna position encoder in
Figure 18. Also select the proper cabling option depending upon the type of antenna positioning system. Option 001 is for interfacing to Scientific-
Atlanta position indicator model numbers SA1842,
SA1843, SA1844 and SA4400. Option 002 is for interfacing to Flam & Russell 8502 and Orbit AL-
4706-3A positioner controllers. For interfacing to other positioning systems, consult your Agilent
Technologies sales representative.
28
To interface the 85370A antenna position encoder to the 8530A microwave receiver requires
Option 005 (encoder interface) for the 8530A. For existing 8530A receivers without this option, an upgrade kit is available; consult your Agilent
Technologies sales representative for more information.
Synchro Display
Synchro Interface Cable
Either Option 001 or 002
Positioner Control Unit
Control Lines
Figure 14. Antenna position encoder interconnect diagram
85370A
Antenna Position Encoder
Synchro Cable
(Existing)
Antenna
Under Test
23
Measurement automation software
Measurement software is very popular for automating antenna measurements and improving measurement throughput and productivity. Most modern antenna measurement systems use software, since manual antenna pattern measurements are usually not a cost-effective way to analyze antenna performance. Measurement software for
85301B/C systems is provided by Agilent
Technologies’ channel partner, Nearfield Systems,
Inc. (NSI). NSI offers both far-field and near-field measurement automation software.
Far-field measurement software
NSI’s far-field measurement software is a
Windows®-based program that runs on a personal computer and automates the data acquisition and analysis process. For data acquisition, full control is provided over the start and stop angles, angular sampling increment and number of test channels.
For analysis, patterns can be displayed in either
Cartesian or polar formats, and data analysis capabilities include gain, beamwidth, sidelobe levels, and pattern overlay and comparisons. The software allows archiving of pattern data to disk or a variety of printers.
Near-field measurement software
Near-field measurement software is also provided by our channel partner, Nearfield Systems, Inc.
(NSI). NSI’s software runs on a personal computer, and automates the data acquisition and analysis process. Near-field software is available for planar, cylindrical or spherical scanners. Combination scanners such as planar/cylindrical, or planar/spherical are also supported. For data acquisition, full control is provided over all aspects of the data acquisition process. The software includes the capability to transform the near-field data to far-field antenna pattern data. For data analysis, a variety of data presentation formats are available: raw amplitude and phase data, threedimensional and contour patterns, as well as Eplane and H-plane pattern cuts.
Additionally, the software offers microwave holographic imaging capability,which is often useful for identifying antenna faults. Microwave holography can form images of the sampled RF energy at the surface of an aperture or radome. A further capability is to rotate the imaging plane in yaw so as to view the energy leaving the antenna. These holographic capabilities have been used to find phasing errors in phased-array antennas.
29
Indicate the type of antenna measurement automation software desired on Figure 20.
Personal computer
All of the measurement automation software runs on a PC. Since PC features and configurations change frequently, it is best to consult Nearfield
Systems, Inc., for its recommendations on the correct and latest PC configuration for its application software.
30
Indicate on Figure 20 if a PC is required, and if either an HP LaserJet or color printer is desired.
Millimeter-wave configuration
85301C (8511A/B-based)
The 85301C standard system utilizes an 8511A harmonic sampler-based frequency downconverter, which provides frequency coverage from 45 MHz to 26.5 GHz. The 85301C system with Option 001 extends the frequency coverage from 45 MHz to
50 GHz by substituting an 8511B for the 8511A, and substituting an 83651B microwave source for the 83631B source.
85301B (85310A-based)
The 85301B antenna measurement system provides the most flexibility and expandability for millimeter-wave configurations. The standard 85301B antenna measurement system provides frequency coverage from 2 to 20 GHz. By utilizing an 83650B
50 GHz source and 85320A/B-H50 mixers, the frequency coverage can be extended to 50 GHz. The
85320A/B-H50 mixers are special-option 2 to 50 GHz mixers with 2.4-mm male connectors on the RF ports.
24
Millimeter-wave subsystems
Also available for extending the frequency coverage of the 85301B system are millimeter-wave subsystems, which provide millimeter expansion capability for the standard 85301B system.
The Agilent 85325A millimeter-wave interface kits use
83550 series millimeter-wave source modules, which provide signals from 26.5 to 110 GHz in standard waveguide bands. The millimeter-wave source modules multiply an 11 to 20 GHz signal by either 3, 5 or 7 to produce the desired output frequency. The source modules require a high-power
11 to 20 GHz signal for proper operation.
RF source requirements
The 83623B and 83624B synthesizer sweepers have adequate output power to drive the source modules directly. All other synthesizers require an
8349B microwave amplifier to provide proper RF drive power to the millimeter-wave source modules.
Table 13. Summary of 83550 series millimeter-wave source modules
Source Module
Model Number Band
Frequency Range
(GHz)
Output Power
(dBm)
83554A
83555A
33556A
83557A
33558A
U
V
R
Q
W
26.5 to 40
33 to 50
40 to 60
50 to 75
75 to 110
+7
+3
+3
+3
0
The Agilent 11970 series mixers used in the 85325A millimeter-wave source modules all operate in a harmonic mode with a 3 to 6.09 GHz LO signal.
The 11970 series mixers are weather-resistant but not weatherproof. Use appropriate caution in outdoor applications.
Millimeter-wave performance
Millimeter-wave performance using the 85325A millimeter-wave interface kits is listed in Table 14.
31
Indicate in Figure 21 if millimeter-wave capability is desired for this system.
32
Indicate in Figure 21 if an 8349B microwave amplifier is required.
Table 14. Millimeter-wave system performance
Characteristic
Sensitivity 1 (dBm) (No avg)
Sensitivity 1 (dBm) (128 avg)
Compression level (dBm)
Dynamic range (dB) (No avg)
Channel isolation (dB)
Typical RF input return loss 2 (dB)
R-Band
26.5 to 40 GHz
-109
-88
-19
79
100
15.5
Q-Band
33 to 50 GHz
-106
-85
-24
71
100
15.5
1. Sensitivity is shown where signal = noise.
2. At the input of test and reference isolators. Typical RF input return loss of 11970 mixers is 8.5 dB.
3. Maximum cable lengths with special high-powered 85309A-H30, H31, H32 units.
4. Typical performance values are in parenthesis.
U-Band
40 to 60 GHz
-107
-86
-24
72
100
15.5
V-Band
50 to 75 GHz
-99 (-103) 4
-78 (-82) 4
-18
60 (68) 4
100
9.5
W-Band
75 to 110 GHz
-92 (-95) 4
-71 (-74) 4
-15
56 (62) 4
100
9.5
25
Maximum cable lengths with millimeter-wave mixers
Figure 15 shows the RF power levels required for proper operation with the 85325A millimeter-wave interface kit. Table 15 shows the allowed 85381C cable lengths from the diplexer modules to the
85309A LO/IF distribution unit with standard and low-loss cables.
Multiple test channel configuration
Many of today’s antennas have multiple test ports.
To increase test productivity, it is often desirable to measure all of the test ports during one rotation of the antenna. Agilent Technologies offers two different multiple-channel measurement configurations: internal IF switching and RF switching.
Internal IF switching
Internal IF switching allows up to three test channels (plus a fourth reference channel) to be measured. This capability requires a test mixer for each test channel and additional test channels in the 85309A LO/IF distribution unit. Internal IF switching operates by sending the 20 MHz IF signals from each test mixer to the 8530A microwave receiver; the receiver then switches between each of the test signals internally, and detects and processes each test signal.
Internal IF switching has two main benefits:
• Fast switching times of 4000 channel switches per second
• The ability to measure multiple-channel millimeterwave antennas at frequencies above 40 GHz, where solid-state PIN switches are not readily available
IF switching is limited to a maximum of three test channels.
33
Indicate in Figure 22 if IF switching capability is desired, and the number of test channels required.
83620B
Synthesized Source
POut = 13 dBm
Cable Length L1
85309A
LO/IF Distribution Unit
PIn = 0-5 dBm
Figure 15. Required RF power levels for millimeter-wave mixers
Table 15. Cable lengths with 11970 series millimeter-wave mixers
Cable type
Maximum
LO Frequency (GHz)
Maximum cable length
(L1, meters) LO source to 85309A
85381A
MA/COM FA29RX
6
6
17.1 (9.2) 3
30 (19) 3
1. Sensitivity is shown where signal = noise.
2. At the input of test and reference isolators. Typical RF input return loss of 11970 mixers is 8.5 dB.
3. Maximum cable lengths with special high-powered 85309A-H30, H31, H32 units.
4. Typical performance values are in parenthesis.
POut = 20.8 dBm
ALC
PIn = 16.5 dBm
85326A
R
11970X
PIn = 16.0 dBm
Ref
POut = 20.8 dBm
Cable Length L2
T
85326A
Test Diplexer
Test
Maximum cable length
(L2, meters) 85309A to
85320A/B
5.5 (13.8) 3
11.5 (28.9) 3
Operating bands
26.5 to 110 GHz
26.5 to 110 GHz
26
RF switching
RF switching uses a solid-state PIN switch to switch multiple antenna test ports into one test mixer for downconversion and processing by the receiver. With this method, up to 64 test ports can be measured in one rotation of the AUT.
The 85331/32A microwave PIN switches offer SP2T and SP4T configurations, operate over the frequency range of 45 MHz to 40 GHz (50 GHz is optional) and provide 50-ohm termination in the off state.
Refer to the Agilent 85330/31/32A Technical Data
Sheet (publication no. 5091-9009E) for complete performance specifications.
The benefits of RF switching are:
• High configuration flexibility
• Ability to expand for additional test channels
Steps 34 through 40 are referenced in Figure 23.
34
Indicate if RF switching capability is desired.
35
Indicate if PIN switching is required on the transmit side of the antenna range, and the number of switch positions required. If no RF switching is required, check the ‘No RF switching is
36
Indicate the desired length of the 85384A cable from the switch control unit to the PIN switch. The
85384A cable is available in lengths of 1, 2, 5, and
10 meters.
37
Indicate the desired length of the 85383A cable from the 85330A multiple channel controller to the switch control unit. The 85383A cable is available in lengths of 2, 5, 10, 20, and 50 meters.
38
Indicate the number of switch positions required on the AUT side of the antenna range. If no RF switching is required on the AUT side, check
39
Indicate the length of the 85384A switch control cable from the switch control unit to the PIN switch. The 85384A cable is available in lengths of
1, 2, 5 and 10 meters.
40
Indicate the desired length of the 85383A cable from the 85330A multiple channel controller to the switch control unit. The 85383A cable is available in lengths of 2, 5, 10, 20, and 50 meters.
Antenna positioning systems
Far-field positioning systems
For far-field applications, the Agilent 85301B/C systems are compatible with the Flam & Russell
8502, Orbit AL-4706, Orbit AL-4806-3A and
Scientific-Atlanta 4139 positioner controllers.
These control a wide variety of synchro-based positioners, allowing the 85301B/C systems to be integrated with almost any positioning system. If a new positioning system is required, Agilent recommends Nearfield Systems’ positioning products. An antenna positioner configuration guide is available for configuring an antenna positioner system to meet your far-field application requirements.
Contact your Agilent Technologies sales representative, or Nearfield Systems for assistance with all of your positioner requirements. NSI can be contacted at:
Nearfield Systems, Inc.
Telephone: (310) 518-4277
FAX: (310) 518-4279 www.nearfield.com
A brief positioner configuration guide is provided in Figures 24 and 25.
27
Steps 41, 42 and 43 are referenced in Figure 24.
41
Indicate if a polarization axis positioner is required on the source antenna side of the antenna range. Provide the model number of any polarization axis positioner that is to be used with this system. There are two types of polarization axis positioners: 1) a polarization positioner with a low rotation speed and high position accuracy (used to change the polarization of a source antenna by rotating the source antenna 90 degrees), and 2) a rotating polarization positioner with a high rotation speed (10-30 revolutions per minute) and low positioning accuracy (used to measure the ellipticity or axial ratio of a circularly polarized antenna by rapidly spinning a linear source antenna).
42
Indicate if a positioner controller and positioner power supply are required. If existing units are to be used, indicate their model numbers.
43
Indicate the length of polarization control cables, if required.
Steps 44 through 48 are referenced in Figure 25.
44
Indicate the type of antenna under test (AUT) positioner to be used with this system. If an existing positioner is to be used, indicate the model number of this positioner. If a new AUT positioner is required, indicate the axis required. An upper azimuth axis is almost always required, an elevation axis is frequently required, and a lower aximuth axis is seldom required.
45
Indicate if an existing model tower or roll axis positioner is available or required for this system.
A model tower is sometimes used for mounting antennas above the metal AUT positioner. Model towers are usually made from non-conductive materials.
46
Indicate if an existing positioner controller is available or required for this system. If an existing positioner controller is to be used, indicate its model number.
47
Indicate if an existing positioner power supply is available or required for this system. If an existing positioner power supply is to be used, indicate its model number.
48
Indicate if existing positioner control cables are available or required for this system, and the length of these cables.
Near-field positioning systems
For near-field applications, Nearfield Systems, Inc.
(NSI) provides a wide variety of standard and custom robotic positioning systems that are all compatible with Nearfield application software. NSI can be contacted at:
Nearfield Systems, Inc.
(310) 518-4277 fax: (310) 518-4279 e-mail: [email protected]
www.nearfield.com
28
Configuration Diagrams
1
Customer:
Address:
Customer contact:
Telephone:
Sales engineer:
Telephone:
Agilent systems engineer:
Telephone:
FAX:
Location:
FAX:
Location:
FAX:
Date:
Objective:
❏ New antenna range or ❏ Upgrade of existing range
Antenna range parameters
Select either far- or near-field range
❏ Far-field antenna range ❏ Near-field antenna range
Range length:_________meters Scan surface size:_____________
Range type: (check one)
❏ Outdoor (elevated)
❏ Outdoor (ground reflection)
❏ Indoor (rectangular)
❏ Indoor CATR
Manufacturer:________________
Model number:_______________
❏ Other:_______________________
Range type: (check one)
❏ Planar near-field
❏ Cylindrical near-field
❏ Spherical near-field
❏ Combination of planar, cylindrical or spherical near-field
❏ Type is unknown
Range transfer function* (P r
/P t)
Low frequency_____-dB
High frequency_____-dB
8
Test channel received power*
(Boresight)
P r
(TEST) = P t
+ P r
/P t
+ G (AUT)
P r
(TEST) = _____-dBm
9
Connector information
System component Connector type
20 24
e.g., N (f), SMA (m), etc.)
Transmit antenna
Antenna-under-test
Reference antenna (if used)
Rotary joint both ends (if used)
Bulkhead feedthrough
Other
9
10
11
12
Measurement sensitivity
Test channel received power =
P r
(TEST) =
Dynamic range = D =
_____dBm
_____dB m
Signal-to-noise ratio
(accuracy) = S/N = _____dB m
Required measurement sensitivity =
P r
(TEST) - [D+S/N]= _____dBm
* Only for far-field antenna ranges; not required for nearfield ranges.
Existing equipment
Miscellaneous
(any equipment to be used that already exists; e.g., amplifiers, enclosures, etc.)
__________________________________________
__________________________________________
__________________________________________
__________________________________________
__________________________________________
__________________________________________
Figure 16. General antenna range information and system parameter calculation table
29
3
A1 _____ meters
A3 _____ meters
RADIATED REFERENCE
7
Pt = _____ dBm
OR
5
TRANSMIT
ANTENNA
GAIN _____ dBi
OR
4
TRANSMIT AMPLIFIER
Frequency Range _____ GHz
Gain _____ dB
Output Power _____ dBm
Input Power _____ dBm
A2 _____ meters
7
COUPLED REFERENCE
Insertion Loss ____ dB
Pt = _____ dBm
A4 _____ meters
Coupling
Factor _____ dB
6
A5 _____ meters
2
TEST FREQUENCY
Min _____ GHz
Max _____ GHz
Transmit
Source
Output Power _____ dBm
TRANSMIT SOURCE
(Check One) o 83620B (0.01 - 20 GHz) o 83621B (0.045 - 20 GHz) o 83622B (2 - 20 GHz) o 83623B (0.01 - 20 GHz HI PWR) o 83624B (2 - 20 GHz HI PWR) o 83630B (0.01 - 26.5 GHz) o 83631B (0.045 - 26.5 GHz) o 83640B (0.01 - 40 GHz) o 83650B (0.01 - 50 GHz) o 83651B (0.045 - 50 GHz)
37204A
GPIB Extender
Figure 17. Configuration block diagram for antenna range transmit site
D _____ meters
To Receive
Site
To Receive
Site
30
27
14
Gain _____ dBi
Reference
Antenna
RADIATED REFERENCE
Coupled Reference
(From Transmit Site)
16
Pr (REF) = _____ dBm
OR
Test
Antenna
15
Pr (REF) = _____ dBm
9
Est. gain _____ dBi
85320B
Ref. Mixer
Module
18
B2 _____ meters
19
C1/C2 _____ meters
9
Pr (TEST) = _____ dBm
85320A
Test Mixer
Module
18
B4 _____ meters
18
B5 _____ meters
Rotary
Joint
17
Loss _____ dB
28
❏ 85370A Antenna Position Encoder
❏ Option 001 (for SA positioning systems)
❏ Option 002 (for ORBIT/FR positioning systems)
❏ 8530A Option 005 Encoder interface
B2-B5 Cable Type _____
OR
18
B3 _____ meters
8530A
Microwave
Receiver
19
C3 _____ meters
19
C4 _____ meters
85309A
LO/IF Unit
(From Transmit Site)
LO SOURCE
(Check One)
❏ 83620B
❏ 83622B
❏ 83623B
❏ 83624B
13
37204A
GPIB Extender
19
C5 _____ meters
Figure 18. Configuration block diagram for 85301B antenna measurement system receive site
18
B1 _____ meters
Type _________
31
Test
Antenna
9
Est. Gain _____ dBi
22
B1 _____ meters
22
B3 _____ meters
25
Reference
Antenna
Gain _____ dBi
23
OR
B4 _____ meters
Rotary
Joint
Loss _____ dB
Cabled Reference (From Transmit Site (A5))
OR
8530A
Microwave
Receiver
26
Pr (REF) = _____ dBm
Distance _____ meters
(From Transmit Site)
37204A
GPIB Extender
(Fiber Opt. 013)
21
IF Interconnect cable length (check one) o 5 feet P/N 08510-60106 o 10 feet P/N 08510-60107 o 20 feet P/N 08510-60103 o 40 feet P/N 08510-60104 o 70 feet, order 8510B-K41 special
Figure 19. Configuration block diagram for 85301C antenna measurement system receive site
9
22
B2 _____ meters
8511A/B
Frequency
Converter
Pr (TEST) = _____ dBm
Measurement automation
Measurement automation software
Antenna automation software is provided by
Agilent’s channel partner, Nearfield
Systems Inc.
❏ Far-field software required.
❏ Near-field software required.
❏ No measurement automation software required.
Personal computer
❏ Personal computer to be supplied; latest model and configuration.
❏ No personal computer is required.
Printer
❏ HP LaserJet printer required; latest model and configuration.
❏ Color printer required; latest model and configuration.
❏ No printer required.
Figure 20. Measurement automation
32
31
Millimeter-wave capability for 85301B antenna measurement systems o Millimeter-wave frequencies are not required at this time.
Skip the rest of Figure 21.
o Millimeter-wave frequency capability is required.
Complete this section: o Millimeter-wave coverage to only 50 GHz or less is required.
An 83650B microwave source will be substituted for the standard
83620B, and 85320A/B-H50 mixers (2 to 50 GHz) will be substituted for standard mixers.
o Millimeter-wave capability beyond 50 GHz is needed.
Complete this page.
Millimeter-wave frequency coverage can be added to an 85301B antenna system by adding an 85326A millimeter-wave interface kit and the appropriate 85325A millimeter-wave subsystem kit.
Test Channel
Source
Antenna
Antenna
Under
Test
Third Test Channel o 85325A Option 002
11970 Series
Mixer
Second Test Channel o 85325A Option 001
11970 Series
Mixer
11970 Series
Mixer
Reference channel for coupled or radiated reference
11970 Series
Mixer
LO
Ref
IF
Ref
Agilent 85325A Millimeter-wave subsystem
83550 Series mm-wave
Multiplier
8349B
Microwave
Amplifier
32
o 8349B
Amplifier
Required
From RF
Source
Not part of
85325A
Millimeter-wave subsystem kits: o
R85325A R-band (26.5-40 GHz) millimeter-wave subsystem o
Q85325A Q-band (33-50 GHz) millimeter-wave subsystem o
U85325A U-band (40-60 GHz) millimeter-wave subsystem o
V85325A V-band (50-75 GHz) millimeter-wave subsystem o
W85325A W-band (75-110 GHz) millimeter-wave subsystem o
Option 001 adds one additional test channel to the above
85325A kits, to provide a total of two test channels and one reference channel.
o
Option 002 adds two additional test channels to the above
85325A kits, to provide a total of three test channels and one reference channel.
LO
Test
IF
Test
Diplexer
LO
Test
IF
Test
Diplexer
LO
Test
IF
Test
Diplexer
LO/IF LO/IF LO/IF o 85326A Standard o 85326A
Option 001 o 85326A
Option 002
85326A Millimeter-wave Interface Kit
To/From 85301B;
Interfaces to 85309A LO/IF Distribution Unit
Millimeter-wave Interface Kits:
Contain all of the frequency-independent hardware necessary to interface a millimeter-wave subsystem to a standard 85301B antenna measurement system.
o
85326A millimeter-wave interface kit; one required to interface an 85325A millimeter-wave band kit to a standard 85301B.
o
Option 001 adds one additional test channel to the interface kit; required if the 85325A millimeter-wave subsystem is ordered with Option 001.
o
Option 002 adds two additional test channels to the interface kit; required if the 85325A millimeter-wave subsystem is ordered with Option 002.
Only one 85326A millimeter-wave interface kit is required; one interface kit can be used to interface any 85325A millimeter-wave subsystem.
Figure 21. Millimeter-wave subsystem and interface kit
33
85320B
Reference
Test Mixer
Optional
Third Test Channel
Optional
Second Test Channel
Channel 1
Test Mixer
85320A
85320A
85320A
33
o
IF switching capability is desired.
o
Standard configuration:
One reference and one test mixer; 7m cables; 85309A has one reference and one test channel.
o
Option 001: add one additional test channel.
One reference and two test mixers; 7m cables; 85309A has one reference and two test channels.
o
Option 002: add two additional test channels.
One reference and three test channels; 7m cables; 85309A has one reference and three test channels.
o
IF switching capability is not required.
85309A
LO/IF Distribution Unit
Figure 22. Multiple-channel IF switching configuration
36
85384A: Length:_______meters
85331A
Switch
Control
Unit
V
1 P2T
PIN Switch
H
34
o Multiple-channel capability is not required at this time.
Skip this page; this capability can be added later as an upgrade if desired.
o Multiple-channel capability is desired.
Complete this page.
35
Switch Positions:_____
Source Antenna
38
39
Switch Positions:_____
85384A: Length:_______meters
85332A
Antenna Under Test
Switch
Control
Unit
Reference Mixer
85310A
Distributed Frequency
Downconverter
1 P4T
Pin Switch
37
85383A
Length:_______ meters
85330A
Multiple Channel Controller
8360 Series
Microwave Synthesizer
Test Mixer
85330A
Multiple Channel Controller
40
85383A
Length:_______ meters
8360 Series
Microwave Synthesizer
8530A
Microwave Receiver
Computer
37204A
GPIB Extender
Coax to 1,250 meters
Fiber to 3,000 meters
37204A GPIB Extender
85385A 50 to 1600 meters
35
o No RF switching is required on the transmit side of antenna range.
Figure 23. Multiple-channel RF switching configuration
38
o No RF switching is required on
AUT side of antenna range.
34
43
41
Polarization Axis Postioner o
Polarization axis positioner is not required o
Utilize existing polarization positioner; model #:______ o
Low-speed, high-accuracy polarization positioner is required o
High rotation speed, low-positioning accuracy polarization positioner is required
Polarization Control Cables o
Polarization control cables are not required o
Utilize existing polarization control cables o
Polarization control cables are required; indicate required lengths for all cables.
Source
Antenna
Power and limits cable length:______m
Synchro cable length:______m
42
Polarization Axis Controller o
Polarization axis controller is not required o
Utilize existing polarization axis controller; model #:______ o
Polarization axis controller is required
Figure 24. Positioner configuration for source antenna side of range
Antenna
Under Test
45
Roll Axis Model Tower o
Model tower/roll axis is not required o
Utilize existing model tower; model #:______ o
Utilize existing roll axis; model #:______ o
Model tower is required o
Roll axis is required
48
Positioner Control Cables o
Polarization control cables are not required o
Utilize existing polarization control cables o
Polarization control cables are required; indicate required lengths for all cables.
44
AUT Positioner o
Utilize existing positioner; model #:______ o
AUT positioner is required; indicate axis required: o upper azimuth o elevation o lower azimuth
Tachometer cable length:______m
Power limits cable length:______m
Synchro cable length:______m
Control cable length:______m
46
Positioner Controller o
Positioner controller is not required o
Utilize existing positioner controller; model #:______ o
Positioner controller is required
47
Positioner Power Supply o
Positioner power supply is not required o
Utilize existing power supply; model #:______ o
Positioner power supply is required
Figure 25. Positioner configuration for AUT side of antenna range
35
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