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Trademark Acknowledgments
Manual Part Number
N9040-90002
Edition
Edition 1, December 2020
S
upersedes: August 2020
Published by:
Keysight Technologies
1400 Fountaingrove Parkway
Santa Rosa, CA 95403
Warranty
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This chapter contains the specifications for the core signal analyzer. The specifications and
characteristics for the measurement applications and options are covered in the chapters that
follow.
15
UXA Signal Analyzer
Definitions and Requirements
Definitions and Requirements
This book contains signal analyzer specifications and supplemental information. The distinction
among specifications, typical performance, and nominal values are described as follows.
Definitions
— Specifications describe the performance of parameters covered by the product warranty
(temperature = 0 to 55°C also referred to as "Full temperature range" or "Full range", unless
otherwise noted).
— 95th percentile values indicate the breadth of the population (≈2σ) of performance tolerances
expected to be met in 95% of the cases with a 95% confidence, for any ambient temperature in
the range of 20 to 30°C. In addition to the statistical observations of a sample of instruments,
these values include the effects of the uncertainties of external calibration references. These
values are not warranted. These values are updated occasionally if a significant change in the
statistically observed behavior of production instruments is observed.
— Typical describes additional product performance information that is not covered by the product
warranty. It is performance beyond specification that 80% of the units exhibit with a 95%
confidence level over the temperature range 20 to 30°C. Typical performance does not include
measurement uncertainty.
— Nominal values indicate expected performance, or describe product performance that is useful
in the application of the product, but is not covered by the product warranty.
Conditions Required to Meet Specifications
The following conditions must be met for the analyzer to meet its specifications.
— The analyzer is within its calibration cycle. See the General section of this chapter.
— Under auto couple control, except that Auto Sweep Time Rules = Accy.
— For signal frequencies <10 MHz, DC coupling applied.
— Any analyzer that has been stored at a temperature range inside the allowed storage range but
outside the allowed operating range must be stored at an ambient temperature within the
allowed operating range for at least two hours before being turned on.
— The analyzer has been turned on at least 30 minutes with Auto Align set to Normal, or if Auto
Align is set to Off or Partial, alignments must have been run recently enough to prevent an Alert
message. If the Alert condition is changed from “Time and Temperature” to one of the disabled
duration choices, the analyzer may fail to meet specifications without informing the user. If Auto
Align is set to Light, performance is not warranted, and nominal performance will degrade to
become a factor of 1.4 wider for any specification subject to alignment, such as amplitude
tolerances.
Certification
Keysight Technologies certifies that this product met its published specifications at the time of
shipment from the factory. Keysight Technologies further certifies that its calibration
measurements are traceable to the International System of Units (SI) via national metrology
institutes (www.keysight.com/find/NMI) that are signatories to the CIPM Mutual Recognition
Arrangement.
16
UXA Signal Analyzer
Frequency and Time
Frequency and Time
DescriptionSpecificationsSupplemental Information
Frequency Range
Maximum Frequency
Option 5088.4 GHz
Option 51313.6 GHz
Option 52626.5 GHz
Option 54444 GHz
Option 55050 GHz
Preamp Option P088.4 GHz
Preamp Option P1313.6 GHz
Preamp Option P2626.5 GHz
Preamp Option P4444 GHz
Preamp Option P5050 GHz
Minimum Frequency
PreampAC CoupledDC Coupled
Off10 MHz2 Hz
On10 MHz9 kHz
Band
0 (2 Hz to 3.6 GHz)
1 (3.5 to 8.4 GHz)1—1Options 508, 513, 526, 544, 550
2 (8.3 to 13.6 GHz)1—2Options 513, 526, 544, 550
3 (13.5 to 17.1 GHz)2—2Options 526, 544, 550
c
Harmonic
Mixing Mode
1—1Options 508, 513, 526, 544, 550
LO Multiple (N
a
)
Band Overlaps
b
4 (17.0 to 26.5 GHz)2—4Options 526, 544, 550
5 (26.4 to 34.5 GHz)2—4Options 544, 550
6 (34.4 to 50 GHz)4—8Options 544, 550
a. N is the LO multiplication factor. For negative mixing modes (as indicated by the “—” in the “Harmonic Mixing
Mode” column), the desired 1st LO harmonic is higher than the tuned frequency by the 1st IF.
17
UXA Signal Analyzer
Frequency and Time
b. In the band overlap regions, for example, 3.5 to 3.6 GHz, the analyzer may use either band for measurements, in
this example Band 0 or Band 1. The analyzer gives preference to the band with the better overall specifications
(which is the lower numbered band for all frequencies below 26 GHz), but will choose the other band if doing so is
necessary to achieve a sweep having minimum band crossings. For example, with CF = 3.58 GHz, with a span of
40 MHz or less, the analyzer uses Band 0, because the stop frequency is 3.6 GHz or less, allowing a span without
band crossings in the preferred band. If the span is between 40 and 160 MHz, the analyzer uses Band 1, because
the start frequency is above 3.5 GHz, allowing the sweep to be done without a band crossing in Band 1, though
the stop frequency is above 3.6 GHz, preventing a Band 0 sweep without band crossing. With a span greater than
160 MHz, a band crossing will be required: the analyzer sweeps up to 3.6 GHz in Band 0; then executes a band
crossing and continues the sweep in Band 1.
Specifications are given separately for each band in the band overlap regions. One of these specifications is for the
preferred band, and one for the alternate band. Continuing with the example from the previous paragraph
(3.58 GHz), the preferred band is band 0 (indicated as frequencies under 3.6 GHz) and the alternate band is band
1 (3.5 to 8.4 GHz). The specifications for the preferred band are warranted. The specifications for the alternate
band are not warranted in the band overlap region, but performance is nominally the same as those warranted
specifications in the rest of the band. Again, in this example, consider a signal at 3.58 GHz. If the sweep has been
configured so that the signal at 3.58 GHz is measured in Band 1, the analysis behavior is nominally as stated in the
Band 1 specification line (3.5 to 8.4 GHz) but is not warranted. If warranted performance is necessary for this signal, the sweep should be reconfigured so that analysis occurs in Band 0. Another way to express this situation in
this example Band 0/Band 1 crossing is this: The specifications given in the “Specifications” column which are
described as “3.5 to 8.4 GHz” represent nominal performance from 3.5 to 3.6 GHz, and warranted performance
from 3.6 to 8.4 GHz.
c. Band 0 is extendable (set “Extend Low Band” to On) to 3.7 GHz instead of 3.6 GHz in instruments with frequency
option 508, 513 or 526 and with firmware of version A.16.17 or later.
18
UXA Signal Analyzer
Frequency and Time
DescriptionSpecificationsSupplemental Information
Precision Frequency Reference
Accuracy±[(time since last adjustment x
aging rate) + temperature
stability + calibration accuracy
a]b
Temperature Stability
Full temperature range
Aging Rate
±4.5 × 10
−9
±2.5 × 10
−10
/day (nominal)
Total Aging
−8
1 Year
Settability
Warm-up and Retrace
c
300 s after turn on
600 s after turn on
Achievable Initial Calibration Accuracy
d
±3 × 10
±4 × 10
±3.1 × 10
−11
−8
Nominal
±1 × 10
±1 × 10
−7
of final frequency
−8
of final frequency
Standby powerStandby power is supplied to both
the CPU and the frequency
reference oscillator.
Residual FM
(Center Frequency = 1 GHz
≤0.25 Hz × N
(nominal)
e
p-p in 20 ms
10 Hz RBW, 10 Hz VBW)
a. Calibration accuracy depends on how accurately the frequency standard was adjusted to 10 MHz. If the adjust-
ment procedure is followed, the calibration accuracy is given by the specification “Achievable Initial Calibration
Accuracy.”
b. The specification applies after the analyzer has been powered on for four hours.
c. Standby mode applies power to the oscillator. Therefore warm-up and retrace only apply if the power connec-
tion is lost and restored. The warm-up reference is one hour after turning the power on. The effect of retracing
is included within the “Achievable Initial Calibration Accuracy” term of the Accuracy equation.
d. The achievable calibration accuracy at the beginning of the calibration cycle includes these effects:
1) Temperature difference between the calibration environment and the use environment
2) Orientation relative to the gravitation field changing between the calibration environment and the use envi-
ronment
3) Retrace effects in both the calibration environment and the use environment due to turning the instrument
power off.
4) Settability
e. N is the LO multiplication factor.
19
UXA Signal Analyzer
Frequency and Time
DescriptionSpecificationsSupplemental Information
Frequency Readout Accuracy±(marker freq × freq ref accy +
a
+ 2 Hz +
b
)
Example for EMC
0.10%×span + 5% × RBW
0.5 × horizontal resolution
d
Single detector only
±0.0032% (nominal)
a. The warranted performance is only the sum of all errors under autocoupled conditions. Under non-autocoupled
conditions, the frequency readout accuracy will nominally meet the specification equation, except for conditions
in which the RBW term dominates, as explained in examples below. The nominal RBW contribution to frequency
readout accuracy is 2% of RBW for RBWs from 1 Hz to 390 kHz, 4% of RBW from 430 kHz through 3 MHz (the
widest autocoupled RBW), and 30% of RBW for the (manually selected) 4, 5, 6 and 8 MHz RBWs.
First example: a 120 MHz span, with autocoupled RBW. The autocoupled ratio of span to RBW is 106:1, so
the RBW selected is 1.1 MHz. The 5% × RBW term contributes only 55 kHz to the total frequency readout accuracy, compared to 120 kHz for the 0.10% × span term, for a total of 175 kHz.
Second example: a 20 MHz span, with a 4 MHz RBW. The specification equation does not apply because the
Span: RBW ratio is not autocoupled. If the equation did apply, it would allow 20 kHz of error (0.10%) due to the
span and 200 kHz error (5%) due to the RBW. For this non-autocoupled RBW, the RBW error is nominally 30%,
or 1200 kHz.
b. Horizontal resolution is due to the marker reading out one of the trace points. The points are spaced by
span/(Npts – 1), where Npts is the number of sweep points. For example, with the factory preset value of 1001
sweep points, the horizontal resolution is span/1000. However, there is an exception: When both the detector
mode is “normal” and the span > 0.25 × (Npts – 1) × RBW, peaks can occur only in even-numbered points, so
the effective horizontal resolution becomes doubled, or span/500 for the factory preset case. When the RBW is
autocoupled and there are 1001 sweep points, that exception occurs only for spans >750 MHz
c. Specifications apply to traces in most cases, but there are exceptions. Specifications always apply to the peak
detector. Specifications apply when only one detector is in use and all active traces are set to Clear Write. Specifications also apply when only one detector is in use in all active traces and the "Restart" key has been pressed
since any change from the use of multiple detectors to a single detector. In other cases, such as when multiple
simultaneous detectors are in use, additional errors of 0.5, 1.0 or 1.5 sweep points will occur in some detectors,
depending on the combination of detectors in use.
d. In most cases, the frequency readout accuracy of the analyzer can be exceptionally good. As an example, Key-
sight has characterized the accuracy of a span commonly used for Electro-Magnetic Compatibility (EMC) testing
using a source frequency locked to the analyzer. Ideally, this sweep would include EMC bands C and D and thus
sweep from 30 to 1000 MHz. Ideally, the analysis bandwidth would be 120 kHz at −6 dB, and the spacing of the
points would be half of this (60 kHz). With a start frequency of 30 MHz and a stop frequency of 1000.2 MHz and
a total of 16168 points, the spacing of points is ideal. The detector used was the Peak detector. The accuracy of
frequency readout of all the points tested in this span was with ±0.0032% of the span. A perfect analyzer with
this many points would have an accuracy of ±0.0031%
of span. Thus, even with this large number of display
points, the errors in excess of the bucket quantization limitation were negligible.
a. Instrument conditions: RBW = 1 kHz, gate time = auto (100 ms), S/N ≥ 50 dB, frequency = 1 GHz
b. If the signal being measured is locked to the same frequency reference as the analyzer, the specified count
accuracy is ±0.100 Hz under the test conditions of footnote a. This error is a noisiness of the result. It will
increase with noisy sources, wider RBWs, lower S/N ratios, and source frequencies > 1 GHz.
DescriptionSpecificationsSupplemental Information
Frequency Span
Range
Option 5080 Hz, 10 Hz to 8.4 GHz
Option 5130 Hz, 10 Hz to 13.6 GHz
Option 5260 Hz, 10 Hz to 26.5 GHz
Option 5440 Hz, 10 Hz to 44 GHz
Option 5500 Hz, 10 Hz to 50 GHz
Resolution2 Hz
Span Accuracy
Swept
FFT
±(0.1% × span + horizontal resolution
±(0.1% × span + horizontal resolution
a
)
a
)
a. Horizontal resolution is due to the marker reading out one of the sweep points. The points are spaced by
span/(Npts − 1), where Npts is the number of sweep points. For example, with the factory preset value of 1001
sweep points, the horizontal resolution is span/1000. However, there is an exception: When both the detector
mode is “normal” and the span > 0.25 × (Npts − 1) × RBW, peaks can occur only in even-numbered points, so
the effective horizontal resolution becomes doubled, or span/500 for the factory preset case. When the RBW is
auto coupled and there are 1001 sweep points, that exception occurs only for spans >750 MHz.
a. Delayed trigger is available with line, video, RF burst and external triggers.
b. Prior to A.19.28 software, zero span trigger delay was limited to -150 ms to 500 ms.
22
UXA Signal Analyzer
Frequency and Time
DescriptionSpecificationsSupplemental Information
TriggersAdditional information on some of the triggers and
gate sources
VideoIndependent of Display Scaling and Reference Level
Minimum settable level−170 dBmUseful range limited by noise
Maximum usable level
Highest allowed mixer level
a
+ 2 dB (nominal)
Detector and Sweep Type relationships
Sweep Type = Swept
Detector = Normal, Peak, Sample or
Negative Peak
Triggers on the signal before detection, which is
similar to the displayed signal
Detector = AverageTriggers on the signal before detection, but with a
single-pole filter added to give similar smoothing to
that of the average detector
Sweep Type = FFTTriggers on the signal envelope in a bandwidth
wider than the FFT width
RF Burst
Level Range
Level Accuracy
c
−40 to −10 dBm plus attenuation (nominal)
Absolute±2 dB + Absolute Amplitude Accuracy (nominal)
Relative±2 dB (nominal)
Bandwidth (−10 dB)
b
Most cases
d
>80 MHz (nominal)
Start Freq <300 MHz,
RF Burst Level Type = Absolute
a. The highest allowed mixer level depends on the IF Gain. It is nominally –10 dBm for Preamp Off and IF Gain =
Low.
b. Noise will limit trigger level range at high frequencies, such as above 15 GHz.
c. With positive slope trigger. Trigger level with negative slope is nominally 1 to 4 dB lower than positive slope.
d. Include RF Burst Level Type = Relative.
24
UXA Signal Analyzer
Frequency and Time
DescriptionSpecificationsSupplemental Information
Gated Sweep
Gate MethodsGated LO
Gated Video
Gated FFT
Span RangeAny span
Gate Delay Range0 to 100.0 s
Gate Delay Settability4 digits, ≥100 ns
Gate Delay Jitter33.3 ns p-p (nominal)
Gate Length Range
(Except Method = FFT)
Gated FFT and Gated Video Frequency
and Amplitude Errors
1 μs to 5.0 sGate length for the FFT method is fixed at
1.83/RBW, with nominally 2% tolerance.
Nominally no additional error for gated
measurements when the Gate Delay is greater
than the MIN FAST setting
Gated LO Frequency Errors
Gate ≥ 10 μsNominally no additional error when the Gate
Delay is greater than the MIN FAST setting
1.0 μs ≤ Gate < 10 μsNominal error given by 100 ns × N × (Span/ST) × √(SpanPosition × ST / GateLength); see footnote
Gated LO Amplitude ErrorsNominally no additional error when the Gate
Delay is greater than the MIN FAST setting
Phase Noise EffectsGated LO method overrides the loop
configuration to force single loop in place of dual
loop.
Gate SourcesExternal 1
Pos or neg edge triggered
External 2
Line
RF Burst
Periodic
a
a. ST is sweep time; SpanPosition is the location of the on-screen signal, 0 being the left edge of the screen and 1
being the right edge. N is the harmonic mixing number.
DescriptionSpecificationsSupplemental Information
Number of Frequency Sweep Points
(buckets)
Factory preset1001
Range1 to 100,001Zero and non-zero spans
25
UXA Signal Analyzer
Frequency and Time
DescriptionSpecificationsSupplemental Information
Resolution Bandwidth (RBW)
Range (−3.01 dB bandwidth)
Standard
1 Hz to 8 MHz
Bandwidths above 3 MHz are 4, 5, 6, and
8 MHz.
Bandwidths 1 Hz to 3 MHz are spaced at
10% spacing using the E24 series (24
per decade): 1.0, 1.1, 1.2, 1.3, 1.5, 1.6,
1.8, 2.0, 2.2, 2.4, 2.7, 3.0, 3.3, 3.6, 3.9,
4.3, 4.7, 5.1, 5.6, 6.2, 6.8, 7.5, 8.2, 9.1 in
each decade.
With Option B2X, B5X, or H1G and
Option RBE
a
10, 15, 20, 25, 30, 40, 50, 60, 70, 80,
100, 133, 150, 200, and 212 MHz, in
Spectrum Analyzer mode and zero span.
Power bandwidth accuracy
b
RBW RangeCF Range
1 Hz to 100 kHzAll±0.5% (0.022 dB)
110 kHz to 1.0 MHz< 3.6 GHz±1.0% (0.044 dB)
1.1 to 2.0 MHz< 3.6 GHz±0.07 dB (nominal)
2.2 to 3 MHz< 3.6 GHz0 to −0.2 dB (nominal)
4 to 8 MHz< 3.6 GHz0 to −0.4 dB (nominal)
Noise BW to RBW ratio
Accuracy (−3.01 dB bandwidth)
c
d
1.056 ±2% (nominal)
1 Hz to 1.3 MHz RBW±2% (nominal)
1.5 MHz to 3 MHz RBW
CF ≤ 3.6 GHz
CF > 3.6 GHz
±7% (nominal)
±8% (nominal)
4 MHz to 8 MHz RBW
CF ≤ 3.6 GHz
CF > 3.6 GHz
±15% (nominal)
±20% (nominal)
Selectivity (−60 dB/−3 dB)4.1:1 (nominal)
a. Option RBE enables wider bandwidth filters in zero span in the Signal Analyzer mode. Available detectors are
Peak+ and Average. VBW filtering is disabled. Minimum sweep time is the greater of 200 μS or 200ns/pt. The
filter shape is approximately square. Support for Average detector was first added in SW Version A.23.05.
26
UXA Signal Analyzer
Frequency and Time
b. The noise marker, band power marker, channel power and ACP all compute their results using the power band-
width of the RBW used for the measurement. Power bandwidth accuracy is the power uncertainty in the results
of these measurements due only to bandwidth-related errors. (The analyzer knows this power bandwidth for
each RBW with greater accuracy than the RBW width itself, and can therefore achieve lower errors.) The warranted specifications shown apply to the Gaussian RBW filters used in swept and zero span analysis. There are
four different kinds of filters used in the spectrum analyzer: Swept Gaussian, Swept Flattop, FFT Gaussian and
FFT Flattop. While the warranted performance only applies to the swept Gaussian filters, because only they are
kept under statistical process control, the other filters nominally have the same performance.
c. The ratio of the noise bandwidth (also known as the power bandwidth) to the RBW has the nominal value and
tolerance shown. The RBW can also be annotated by its noise bandwidth instead of this 3 dB bandwidth. The
accuracy of this annotated value is similar to that shown in the power bandwidth
accuracy specification.
d. Resolution Bandwidth Accuracy can be observed at slower sweep times than auto-coupled conditions. Normal
sweep rates cause the shape of the RBW filter displayed on the analyzer screen to widen significantly. The true
bandwidth, which determines the response to impulsive signals and noise-like signals, is not affected by the
sweep rate.
DescriptionSpecificationSupplemental information
Analysis Bandwidth
a
With Option B25 (standard)25 MHz
With Option B4040 MHz
With Option B2X255 MHz
With Option B5X510 MHz
a. Analysis bandwidth is the instantaneous bandwidth available about a center frequency over which the input sig-
nal can be digitized for further analysis or processing in the time, frequency, or modulation domain.
27
UXA Signal Analyzer
Frequency and Time
DescriptionSpecificationsSupplemental Information
Preselector Bandwidth
Mean Bandwidth at CF
a
Freq Option ≤ 526Freq Option>526
5 GHz58 MHz46 MHz
10 GHz57 MHz52 MHz
15 GHz59 MHz53MHz
20 GHz64 MHz55 MHz
25 GHz74 MHz56 MHz
35 GHz62 MHz
44 GHz70 MHz
Standard Deviation9% 7%
−3 dB Bandwidth−7.5% relative to −4 dB bandwidth, nominal
a. The preselector can have a significant passband ripple. To avoid ambiguous results, the −4 dB bandwidth is
characterized.
DescriptionSpecificationsSupplemental Information
Video Bandwidth (VBW)
RangeSame as Resolution Bandwidth range
plus wide-open VBW (labeled 50 MHz)
Accuracy±6% (nominal)
in swept mode and zero span
a. For FFT processing, the selected VBW is used to determine a number of averages for FFT results. That number is
chosen to give roughly equivalent display smoothing to VBW filtering in a swept measurement. For example, if
VBW = 0.1 × RBW, four FFTs are averaged to generate one result.
a
28
UXA Signal Analyzer
Amplitude Accuracy and Range
Amplitude Accuracy and Range
DescriptionSpecificationsSupplemental Information
Measurement Range
Preamp OffDisplayed Average Noise Level to +30 dBm
Preamp OnDisplayed Average Noise Level to +24 dBmOptions P08, P13, P26, P44, P50
Input Attenuation Range0 to 70 dB, in 2 dB steps
DescriptionSpecificationsSupplemental Information
Maximum Safe Input LevelApplies with or without preamp
(Options P08, P13, P26, P44, P50)
Average Total Power+30 dBm (1 W)
Peak Pulse Power
(≤10 μs pulse width,
≤1% duty cycle,
input attenuation ≥ 30 dB)
DC voltage
DC Coupled±0.2 Vdc
AC Coupled±100 Vdc
DescriptionSpecificationsSupplemental Information
Display Range
Log ScaleTen divisions displayed;
Linear ScaleTen divisions
DescriptionSpecificationsSupplemental Information
Marker Readout
+50 dBm (100 W)
0.1 to 1.0 dB/division in 0.1 dB steps, and
1 to 20 dB/division in 1 dB steps
Resolution
Log (decibel) units
Trace Averaging Off, on-screen0.01 dB
Trace Averaging On or remote0.001 dB
Linear units resolution≤1% of signal level (nominal)
29
UXA Signal Analyzer
Amplitude Accuracy and Range
Frequency Response
DescriptionSpecificationsSupplemental Information
Frequency ResponseRefer to the footnote for
(Maximum error relative to
reference condition (50 MHz)
b
Mechanical attenuator only
Swept operation
c
, LNP offd,
,
Attenuation 10 dB)
Option 544 or 550 (mmW)
Option 508, 513, or 526 (μW)
20 to 30°CFull range95th Percentile (≈2σ)
3 Hz to 10 MHzxx±0.46 dB±0.54 dB
10 to 20 MHzx±0.35 dB±0.44 dB±0.19 dB
Band Overlaps on page 17.
Freq Option 526 only: Modes
above 18 GHz
a
10 to 20 MHz
20 to 50 MHz
20 to 50 MHz
e
x±0.46 dB±0.54 dB±0.20 dB
x±0.35 dB±0.44 dB±0.19 dB
x±0.35 dB±0.44 dB±0.20 dB
50 MHz to 3.6 GHzx±0.35 dB±0.44 dB±0.14 dB
50 MHz to 3.6 GHz
3.6 to 3.7 GHz (Band 0)x
3.5 to 5.2 GHz
3.5 to 5.2 GHz
5.2 to 8.4 GHz
5.2 to 8.4 GHz
8.3 to 13.6 GHz
8.3 to 13.6 GHz
13.5 to 17.1 GHz
13.5 to 17.1 GHz
gh
gh
gh
gh
gh
gh
gh
gh
x±0.35 dB±0.47 dB±0.16 dB
See note
x±1.5 dB±2.5 dB±0.50 dB
x±1.7 dB±3.5 dB±0.69 dB
x±1.5 dB±2.5 dB±0.42 dB
x±1.5 dB±2.5 dB±0.42 dB
x±2.0 dB±2.7 dB±0.51 dB
x±2.0 dB±2.5 dB±0.39 dB
x±2.0 dB±2.7 dB±0.57 dB
x±2.0 dB±2.7 dB±0.54 dB
f
17.0 to 22 GHz
17.0 to 22 GHz
gh
gh
x±2.0 dB±2.7 dB±0.65 dB
x±2.0 dB±2.8 dB±0.62 dB
30
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