SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
IQ Analysis (Requires Option 353, SA Mode Only)
2. Press IQE Sample Rate > Auto (default).
3. Press Average Count
> 10 (default). Learn more refer to “Adjusting the
Measurement Setup Settings” on page 292.
4. Press Average Type
> Auto (default). Learn more refer to “Adjusting the
Measurement Setup Settings” on page 292.
5. Press Freq/Dist
> Center > 1 GHz
6. Press Freq Span > 1 MHz (default).
How to Setup IQ Analysis Streaming
The feature provides continuous streaming of IQ data up to 1.25 MSamples/sec
over the Ethernet port in either VITA49A or Decodio formats.
If locked to GPS, will populate the timestamp applied to streamed data
packets. If not locked to GPS, the system clock time is used to stamp the
streamed data packets. Refer to Chapter 30, “System Settings” and to
“Frequency Reference” on page 748.
General setup for IQ Streaming:
1. Press Meas Setup 4
> IQ Analysis > Streaming
2. Then IQE SampRate > Manual > 1.25 MHz (default when set to Auto).
Setting the IQE sample rate to Manual, forces the Span to be:
Spa
n = 0.8 * Sample rate.
3. Configure Center Frequency, Span, Preamp, and RF Attenuation
a. Press Freq/Dist
> Center > 1 GHz
b. Press Freq Span
> 1 MHz (default).
This forces the Span to be:
Span = 1.25 * Span.
a. Then to adjust receiver gain:
Press Scale/Amptd then
This feature’s intended use is that the Streamed data will be sent to
another computer. That computer or another one will act as a SCPI
controller and is required for actually controlling the streaming, in
particular setting up network data and starting and stopping the
streaming.
Typically, the goal is to be able to see the desired signal that you want to
capture as close as possible to the top of the display grid on the screen,
without causing an ADC over range to be displayed. This maximizes the
signal-to-noise ratio.
Keysight N9938-90003 User's Guide
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