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Real-Time Spectrum Analyzer WiMAX Software
LitePoint IQsignal™ Software for Tektronix Real-Time
Spectrum Analyzers
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Features & Benefits
- Software Suite for WiMAX 802.16e-2005
/ WirelessMAN-OFDMA and 802.16-2004 / WirelessMAN-OFDM Signal Analysis
- Quickly Detect, Diagnose, and Resolve WiMAX Design Errors
- Easy-to-Use Graphical User Interface, Running on Standalone
PC
- Supports Tektronix Real-Time Spectrum Analyzers and the
LitePoint IQmax™ WiMAX Test System
- Automate Measurements
for System Troubleshooting and Device Stress Testing
Applications
- Component and System R&D
- Product Development
- Design Verification
- Product
Debugging
Trigger,
Capture, Analyze
RSA-IQWIMAX provides spectrum and modulation
measurements on OFDM and OFDMA signals in accordance with standard
IEEE 802.16-2004 (fixed) and IEEE 802.16e (mobile) WiMAX standards.
The Tektronix Real-Time Spectrum Analyzer captures intermittent or
random events that other solutions will miss, enabling engineering
teams to detect, diagnose, and resolve design errors more quickly.
The combination of an RSA6100A or RSA3000A Real-Time Spectrum Analyzer
(RTSA) and RSA-IQWIMAX demodulation software enables you to perform
the much needed time, frequency, and modulation domain measurements
to decompose signals and uncover anomalies, and generate in-depth
analysis for troubleshooting WiMAX devices at the design stage.
Description
RSA-IQWIMAX offers advanced analysis of
WiMAX waveforms captured by the RTSA, including EVM and spectral measurements.
For example, RSA-IQWIMAX can easily analyze frequency settling time
and phase errors that occur during a burst transmission. Such capabilities
significantly help in understanding and debugging RF performance-related
issues. A PC is used to run the RSA-IQWIMAX analysis software and
control the RTSA via either a 10/100 Base-T Ethernet or IEEE 488.2
GPIB connection. The software's application programming interface
allows users to automate measurements to characterize system and device
performance. RSA-IQWIMAX software supports Tektronix .IQT and .TIQ
file formats, and the LitePoint .SIG and .MOD formats.
The
RSA-IQWIMAX software supports in-band transmit analysis through a
graphical display of these tests including:
- Spectrum
(PSD) and Mask
- Symbol Constellation
- Spectral Flatness,
Delta Spectral Flatness
- Captured Waveform Display in the
Time Domain
To support product debugging, various other
graphical displays are supported by RSA-IQWIMAX, including:
- Phase Error Versus Time
- Frequency Error Versus Time
- CCDF (to Support Compression Analysis)
- Spectrogram
- EVM (Versus OFDM Subcarriers; Versus Time)
Burst Map Configuration Summary
Besides
the graphical display of measurements, RSA-IQWIMAX also presents relevant
numerical data including:
- EVM (All, Data, Pilots, Unmodulated)
- Power (Peak, Average)
- Frequency Error
- Symbol
Timing Error
- Integrated Phase Noise
- I/Q Imbalance
(Amplitude, Phase)
- Reed-Solomon Errors
- Average of
Numerical Data over Multiple Captures Can Also be Displayed
RSA-IQWIMAX additionally provides a wide range of compensation
methods that can be used for advanced analysis of a captured signal’s
sensitivity to certain impairments. For example, the available compensation
methods when analyzing OFDM signals include:
- Phase Tracking
(Off, Fast)
- Channel Estimation (Based on Averaging of the
Long Training Sequence, Averaging of the Full Packet)
- Symbol
Timing Tracking
- Frequency Synchronization (Based on Long
Training Sequence, or Full Packet)
- Amplitude Tracking
Characteristics
Analysis Measurement Results
– Graphical Display
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Characteristic
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Description
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Amplitude vs Time
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Instantaneous and peak power averaged over a symbol duration
(dBm) versus time
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Spectrogram
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3D plot of power spectral density versus time
Time
is displayed on x-axis; frequency offset on y-axis; color coding represents
power (maximum strength is red; minimum strength is green)
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PSD
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Power spectral density (dBm/Hz) versus frequency offset
Spectrum mask per IEEE802.16-2004
Center frequency ± 20 MHz
Resolution bandwidth 100 kHz
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Symbol Constellation
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Visual display of each demodulated symbol in the I/Q complex
plane (data symbols are red; pilot tones are green)
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Spectral Flatness
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Variation from average energy as a function of OFDM subcarrier
number (dB)
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Spectral Delta
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Power difference between adjacent subcarriers (dB)
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Phase Noise (PSD)
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Phase noise power spectral density (dBc/Hz) versus frequency
offset
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Phase Error (time)
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Integrated phase error of pilot tones (degrees) versus time
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CCDF
(complementary cumulative distribution function)
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Probability of peak signal power being greater than a given
power level versus peak-to-average power ratio (dB)
Shown over
all data or payload only
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I & Q signals
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I/Q signal voltages (Vrms) vs time
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Frequency Error
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Frequency error (kHz) versus time
Frequency error during
short and long training sequences
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EVM vs Carrier
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Error Vector Magnitude averaged over all symbols for each
subcarrier (dB) versus OFDM subcarrier number
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EVM vs Time
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Error Vector Magnitude averaged over all subcarriers (dB)
versus time
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Note: Specified corrections are implemented
prior to measurement taking. For example, EVM is calculated after
any specified corrections are applied, thereby affecting the results.
Analysis Measurement Results Numerical Data
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Characteristic
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Description
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Packet Information
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Signal type, down and uplink
Bandwidth, cyclic prefix
Modulation and coding per burst (rate ID)
Number of symbols
for each rate ID type
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EVM All
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EVM averaged over all symbols and all subcarriers (dB; %)
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EVM Data
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EVM averaged over all symbols and all data subcarriers (dB;
%)
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EVM Pilots
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EVM averaged over all symbols and all pilot subcarriers (dB;
%)
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EVM Unmodulated
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EVM averaged over all symbols and all unmodulated subcarriers
(dB; %) (Mobile WiMax only)
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Peak Power
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Peak power over all symbols (dBm)
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Average Power (all)
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Average power of complete data capture (dBm)
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Average Power (no gap)
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Average power over all symbols after removal of any gap between
packets (dBm)
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Average Power (preamble)
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Average preamble power (dBm)
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Average Power (syms)
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Average power over all symbols, excluding preamble (dBm)
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LO (DC) Leakage
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Variation from center carrier (dBc)
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I/Q Amplitude Error
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I/Q amplitude imbalance (%)
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I/Q Phase Error
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I/Q phase imbalance (degrees)
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Total I/Q Mismatch (combined)
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Approximate contribution of amplitude and phase imbalances
to EVM (dB)
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Frequency Error
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Carrier frequency error (kHz)
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Symbol Clock Error
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Symbol clock frequency error (ppm)
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RMS Phase Noise
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Integrated phase noise (degrees)
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OFDMA Ranging
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Ranging code and power level of initial and periodic ranging
bursts (mobile WiMAX and if present only)
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Reed-Solomon Errors
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Number of symbols with RS errors (available only if payload
decoding is enabled; fixed WiMAX only)
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Note: The above measurements are shown for the current
data packet only.
Analysis Measurement Parameters
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Characteristic
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Types/Settings
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Description
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Capture Mode
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Single / Continuous
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Enables one-shot or non-stop data capture and analysis
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Sample Interval
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100 μs, 200 μs, 300 μs, 400 μs, 500 μs, 1 ms, 2 ms, 3 ms,
4 ms, 5 ms, 10 ms
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The sample interval is limited by the buffer size and A/D
sample rate of the instrument.
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Signal Type
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802.16-2004 / WirelessMAN-OFDM (fixed WiMAX)
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Automatically detected: Signal type (up- / downlink burst),
Bandwidth, Modulation / coding, Cyclic Prefix length
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802.16e-2005 / WirelessMAN-OFDMA (mobile WiMAX)
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Automatically detected: Signal type (up- / downlink burst),
Bandwidth, Modulation / coding, Cyclic Prefix length, Uplink fields.
User defines up- and downlink maps (GUI)
Supported mode:
PUSC, single zone, single constellation per symbol.
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Decode
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Off / On
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Enable or disable payload decoding
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Input Mode*1
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Baseband / RF
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Selects type of signal input and enables appropriate ports
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IQ Swap*1
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Off / On
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Interchanges I and Q channel signals on input ports
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Triggers
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Free Run
External Trigger
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Data capture trigger mechanism
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External Attenuation
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-25.0 to 125.0 dB with 0.1 dB resolution
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Attenuation between DUT output and IQmax input (applied as
a correction to measurements)
RF input mode only
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OBW Percentage
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Percentage (0–100)
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Input for occupied bandwidth calculation
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ACLR Bands
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Series of Center Frequency Offset/Span Pairs (both in MHz)
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Input for adjacent channel (leakage) power calculation
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RF Channel (RF Mode Only)
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User-Defined Center Frequency
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Input for non-standard WiMax channel frequencies
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Acquire New
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Off / On
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Acquire new signal capture for analysis or reload current
capture
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EVM & Power Averaging
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1, 10, 20, 40, 60, 80, 100
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Number of measurements (packets) used to calculate average
EVM and power
RSA-IQWIMAX allows arbitrary number of measurements
to be used
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Rx IF
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0 MHz, 5 MHz, 10 MHz, 11 MHz
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To assess Tx performance at IF, down convert the signal to
5 MHz, 10 MHz, or 11 MHz and input it to the baseband ports
To assess Tx performance at baseband or at a supported RF channel,
set to 0 MHz
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Phase Tracking / Correction
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Off
Symbol-by-Symbol Correction
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Phase tracking method
Symbol-by-symbol correction is
specified by IEEE standard for EVM calculation but will mask measurement
of Tx phase noise
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Channel Estimate
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Raw (averaging over long training sequence)
Raw (averaging
over full packet)
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Channel estimation method
Averaging over long training
sequence is most common in practical receiver implementations
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Symbol Timing Tracking
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Off / On
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Timing jitter correction
Symbol timing tracking is
specified by IEEE standard
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Frequency Sync
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Long training sequence (includes short training sequence if
present)
Full data packet
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Carrier frequency error estimation method
Estimation
based on short or long training sequence is most common in practical
receiver implementations
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Amplitude Tracking
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Off / On
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Automatic gain control
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*1 Only relevant for RSA3408A with Option
03, which adds IQ, Differential IQ inputs.
PC System Minimum
Requirements
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Component
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Description
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PC
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Intel Pentium processor or compatible, 500 MHz (1 GHz or higher
recommended)
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Operating System
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Microsoft Windows 2000 (SP3 or higher), Windows XP (SP1 or
higher)
US English versions
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Memory
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512MB of RAM
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Disk Space
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500MB of available hard disk space
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Monitor
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1024 × 768 resolution
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Connectivity
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TCP/IP over 10/100BaseT Ethernet or IEEE488.2 GPIB
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Ordering Information
RSA-IQWIMAX
LitePoint
IQsignal™ Software for Tektronix Real-Time Spectrum Analyzers.
Includes: Quick Start Guide, Software CD and software
license key.
IQview is a registered trademark, LitePoint, TrueChannel,
IQnxn, IQflex, IQmax, IQsignal, IQwave, IQfact, IQcheck, IQdiagnostic,
IQapi, IQtest, and IQdebug are trademarks of LitePoint Corporation..
All other trademarks are the property of their respective owners.
The information furnished by LitePoint Corporation is believed to
be accurate and reliable. However, LitePoint assumes no responsibility
for its use. LitePoint reserves the right to change specifications
and documentation at any time without notice. Copyright © 2006 LitePoint
Corporation. 08/06
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Product(s) are manufactured in ISO registered facilities.
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37W-20197-1, 29-APR-2008
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(WebID: 13397)
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