JDS Uniphase JD7105B User Manual
1 GSM/GPRS/EDGE SIGNAL ANALYZER
JD7105B Base St at ion Analyzer
GSM/GPRS/EDGE Signal Analyzer
This GSM/GPRS/EDGE Signal Analyzer function is optional that the JD7105B Base Station Analyzer
offers as the Option 022 for GSM/GPRS/EDGE. It allows the user to check conformity to the 3GPP TS
51.021 Base Station System (BSS) equipment specification: Radio Aspects V8.9.0 (2003-06) and
analyze GSM/EDGE system performance. The GSM//GPRS/EDGE OTA Analyzer which is the Option
042 can be added to the GSM/GPRS/EDGE Signal Analyzer for Over The Air measurement.
In this Chapter
Using GSM/GPRS/EDGE Signal Analyzer .............................................................................................. 4
Display Overview
Connecting a Cable
Direct Connection
Indirect Connection
Over The Air (OTA)
Spectrum Analysis Measurement
Setting Mode
Setting Frequency
Setting Amplitude
Setting Averaging
Setting Sweep Mode
Setting Trace and Display
Measurement Example
Using Marker
Using Peak Search
RF Analysis Measurements
Setting Mode
Setting Frequency
Setting Amplitude
Setting Averaging
Setting Sweep Mode
Setting Trigger Source
Channel Power ...................................................................................................................................... 21
Measurement Procedure
Setting Limit
Measurement Example
Using Marker
Using Peak Search
Occupied Bandwidth
Measurement Procedure
Setting Limit
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GSM/GPRS/EDGE SIGNAL ANALYZER 2
JD7105B Base St at ion Analyzer
Measurement Example ........................................................................................................... 27
Using Marker
Using Peak Search
Spectrum Emission Mask (SEM)
Measurement Procedure
Setting Limit
Measurement Example
Using Marker
Using Peak Search
Spurious Emissions
Measurement Procedure
Setting Limit
Measurement Example
Using Marker
Using Peak Search
Power vs Time Measurements
Setting Mode
Setting Frequency
Setting Amplitude
Setting Averaging
Setting Sweep Mode
Setting Trigger Source
Setting External Clock
Measurement Procedure
Setting Limit
Measurement Example
Constellation Measurement
Setting Mode
Setting Frequency
Setting Amplitude
Setting Averaging
Setting Trace and Display
Setting Sweep Mode
Setting Trigger Source
Setting External Clock
Measurement Procedure
Setting Limit
Measurement Example
GSM OTA Measurements
Setting Mode
Setting Frequency for Channel/Frequency Scanners
Setting Amplitude
Setting Sweep Mode
Setting Trigger Source
Setting External Clock
GSM OTA Channel Scanner
Setting Mode
Setting Channel
Setting Zoom Position
Measurement Procedure
Measurement Example
GSM OTA Frequency Scanner
Setting Mode
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3 GSM/GPRS/EDGE SIGNAL ANALYZER
JD7105B Base St at ion Analyzer
Setting Frequency ................................................................................................................... 65
Setting Zoom Position
Measurement Procedure
Measurement Example
GSM OTA Multipath Profile
Setting Mode
Measurement Procedure
Measurement Example
GSM OTA Modulation Analyzer
Setting Mode
Measurement Procedure
Setting Limit
Measurement Example
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(Rev. 3.0)
GSM/GPRS/EDGE SIGNAL ANALYZER 4
JD7105B Base St at ion Analyzer
USING GSM/GPRS/EDGE SIGNAL ANALYZER
The Global System for Mobile Communications (GSM) is a digital cellular standard that uses Time
Division Multiple Access (TDMA) multiplexing scheme and Gaussian Minimum Shift Keying (GMSK)
modulation. The Enhanced Data Rates for GSM Evolution (EDGE) is an enhancement to GSM that
promises to deliver true 3G wireless services such as multimedia and other broadband applications. It
uses TDMA and 3π/8 8PSK (phase shift keying) modulation.
The JD7105B performs measurements using the methods and limits as defined in the 3GPP TS
51.021 Base Station System (BSS) equipment specification: Radio Aspects V8.9.0 (2003-06). The
Pass/Fail indictor helps the user to determine base station performance easily.
The JD7105B provides the following analysis tools for GSM/GPRS/EDGE system.
Spectrum Analysis
RF Analysis
Channel Power
Occupied Bandwidth
Spectrum Emission Mask
Spurious Emissions
Power vs Time
Slot
Frame
Constellation
Over The Air (OTA)
Channel Scanner
Frequency Scanner
Multipath Profile
Modulation Analyzer
Auto Measure
5 GSM/GPRS/EDGE SIGNAL ANALYZER
JD7105B Base St at ion Analyzer
DISPLAY OVERVIEW
Overview of GSM Signal Analyzer Display
① Measurement Mode Information: GSM Signal Analyzer
② Spectrum Windows X and Y Scale or Setting Information: This window shows the most
common settings or parameters of each measurement. Frequency/Channel setting, Amplitude
setting (Preamp, Attenuat ion, Ex tern al offset), Ref eren ce setting infor m ation Freq uency/Trigger)
③ Measurement Setting Information
- Spectrum Analyzer Operation Mode Information: Displays the operation mode of
spectrum analyzer, Sweep or FFT
- Detector Type Setting Information: Displays the current selected detector types, Normal,
Peak, RMS, Negative Peak, and Sample
- Spectrum Window’s X Scale Setting Information: Displays RBW, VBW settings
[A]: Auto mode, [M]: Manual mode
- Sweep Time Information: Displays current sweep time
- Average Number Information set through BW/AVG hard key. It shows the number of
traces to be averaged.
GSM/GPRS/EDGE SIGNAL ANALYZER 6
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④ Trace Information
C: Captured
M: Max Hold
m: Min Hold
W: Write Current Trace (Indicates current active trace)
L: Loaded
F: Trace View Off
⑤ Information on Marker Table displays up to 6 markers
⑥ Screen Menu Title
⑦ Screen Menu and Sub-menu
⑧ Scale Unit Information: dBm, dBmV, dBuV, V, and W
⑨ User Input Window: Activates when user input menu or key is selected. Pressing PREV hard
key will cancel or deactivate user input window. Inactivate user input window before usin g 7-hot
keys.
NOTE: It is very important to inactivate the user input window when you intend to use the hot
key menu on the numeric keys.
⑩ Pass/Fail Indicator
7 GSM/GPRS/EDGE SIGNAL ANALYZER
JD7105B Base St at ion Analyzer
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Direct Connection
CONNECTING A CABLE
PA Output Port and RF In Port Connection
Indirect Connection
Monitor Port and RF In Port Connection
The maximum power for the Spectrum Analyzer RF In 50Ω port is 30 dBm (1
Watt). If the input signal level to be measured is greater than 30 dBm, use a High
Power Attenuator to prevent damage when you directly connect the signal to the
instrument. Or connect a signal from the coupling port of a directional coupler.
GSM/GPRS/EDGE SIGNAL ANALYZER 8
JD7105B Base St at ion Analyzer
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Over The Air (OTA)
The maximum power for the Spectrum Analyzer RF In 50Ω port is 30 dBm (1
Watt). If the input signal level to be measured is greater than 30 dBm, use a High
Power Attenuator to prevent damage when you directly connect the signal to the
instrument. Or connect a signal from the coupling port of a directional coupler.
OTA Connection
9 GSM/GPRS/EDGE SIGNAL ANALYZER
JD7105B Base St at ion Analyzer
1. Connect the cable
Connect the signal to the Spectrum A naly zer RF In 50Ω
2. Select the mode
1. Set the frequency
2. Select the channel standard
SPECTRUM ANALYSIS MEASUREMENT
Setting Mode
Step Description
port using the cable whose loss was measured.
MODE
[Signal Analyzer]
[GSM]
[Spectrum]
Setting Frequency
Step Description
FREQ/DIST
[Center Frequency]
Enter a value
[GHz], [MHz], [kHz], or [Hz]
or
[Channel Number]
Enter a value
[Forward] or [Reverse]
Press the MODE hard key.
Press the Signal Analyzer soft key.
Press the GSM soft key.
Press the Spectrum soft key. (Spectrum mode is set by
default.)
Press the FREQ/DIST hard key.
Press the Center Frequency soft key.
Use the numeric keys, the rotary knob, or the arrow keys.
When using the numeric keys, the input is completed by
selecting one of the unit soft keys.
Press the Channel Number soft key.
Enter a channel number using the numeric keys.
Select the direction by pressing the Forward or Reverse.
[Channel Standard]
Select a channel standard
[Select] or ENTER
Press the Channel Standard soft key to get the pop-up
window of the channel standard list.
Press the arrow keys, rotate the knob, or press the Page Up
and Page Down soft keys to highlight a frequency band to
select.
Press the Select soft key or the ENTER hard key.
GSM/GPRS/EDGE SIGNAL ANALYZER 10
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1. Set the reference level
2. Set the attenuation level
FREQ/DIST
CENTER FREQUENCY: Changes the center frequency setup. Values can be entered with the
numeric keys, the rotary knob, or the arrow keys. When using the numeric keys, the input is
completed by selecting one of the unit soft keys including GHz, MHz, kHz, and Hz. When using
the rotary knob or the arrow keys, the frequency changes in a predefined frequency step. The
frequency step can be configured by selecting the Frequency Step soft key.
CHANNEL NUMBER: Enters a channel number and selects the Forward or Reverse soft key.
When using the rotary knob or the arrow keys, the channel changes in a predefined channel step.
The channel step can be configured by selecting the Channel Step soft key.
FREQUENCY STEP: Defines the moving step size of the Center Frequency when using the
rotary knob or the arrow keys. The step size can be en ter ed b y using numeric keys and the unit
soft keys.
CHANNEL STEP: Defines the moving step size of the Channel Number when using the rotary
knob or the arrow keys. The step size can be entered by using numeric keys and the Enter soft
key.
CHANNEL STANDARD: When the channel standard is selected from the list, the center
frequency information on the display screen wi ll be mapped accordingly to the selected channel
standard. The channel standards available in the instrument are listed in the Appendix C – Band,
Frequency & Channel Standard.
Setting Amplitude
Step Description
AMP/SCALE
[Reference Level]
Enter a reference level value
[dBm] or ENTER
Press the AMP/SCALE hard key.
Press the Reference Level soft key.
Use the numeric keys or the rotary knob that changes in a 10
dB step.
Press the dBm soft key or the ENTER hard key.
[Attenuation]
<Auto> or <Manual>
Enter an attenuation value
Press the Attenuation soft key. The Auto mode is set by
default. This key toggles between the Auto and Manual.
Press the Attenuation soft key to highlight the Manual mode
and change the attenuation value to optimize S/N.
Use the numeric keys or the rotary knob that changes in a 5
dB step. The attenuation settin g range is 0 to 55 dB.
11 GSM/GPRS/EDGE SIGNAL ANALYZER
JD7105B Base St at ion Analyzer
!
If the input signal level is higher than +30 dBm or higher than the allowable mixer
AMP/SCALE
AUTO SCALE: The instrument can automatically set the scale to the minimum and maximum
values on the Y-axis of the graph for optimum display of the traces measured. Each time the Auto
Scale is selected, the top and bottom scales are set to the minimum and maximum values with
margin on the Y-axis of the display screen.
REFERENCE LEVEL: Sets the maximum Y-axis range when using the Spectrum Analyzer or
Signal Analyzer function.
SCALE/DIV: Is used only for the Spectrum measurement screen. It represents the value of one
division on the horizontal scale. The default value is 10 dB per divis ion and the Y-Scale is set to
100 dB. Selecting the Scale/Div soft key enables to set the value to 1 dB per division with the
numeric keys or the rotary knob.
ATTENUATION
AUTO: Input attenuator’s value is automatically set depending on the reference level. This is
the default operation mode, so it is recommended to use this mode unless a special
measurement condition is needed.
MANUAL: Sets the attenuator’s value for the Spectrum Analyzer RF In 50Ω port. The
reference level changes according to the change of the attenuator’s value, but the
attenuator’s value does not change when the reference level is changed.
input limit per input attenuator’s value set by the user, a “IF Overload” message will
be displayed on the screen indicating that the input attenuation value must be
increased. When the instrument is exposed to an over power condition for a long
time, its performance may be degraded.
PREAMP: Turns on or off the internal pre-amplifier. The pre-amplifier is to amplify a low-level
input signal. This soft key toggles between the On and Off. When it is turned on, the allowable
attenuation input range is 0 dB to 10 dB w ith 5 dB step. If user sets attenuation value beyond 10
dB, then the instrument will automatically turn off pre-amplifier to display low level signal properly
on the screen.
UNITS: Sets the scale unit on the display among dBm, dBmV, dBuV, V, and W.
EXTERNAL OFFSET: Sets an external offset value. An offset consists of a cable loss and a user
offset and the measurement result shows the value reflecting both offset values. When the
external offset value is set at 40 dB in the Spectrum mode, the measurement result compensates
40 dB at both the Spectrum Analyzer and Signal Analyzer modes.
GSM/GPRS/EDGE SIGNAL ANALYZER 12
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1. Set the sweep mode
1. Set the averaging
2.
3. [Enter] or ENTER
Press the Enter soft key or the ENTER hard key.
Setting Averaging
BW/AVG
AVERAGE: Sets the number of measurements to be averaged for the trace presentation. A
maximum of 99 times of averaging can be set.
Step Description
BW/AVG
[Average]
Enter number of averaging to set Use the numeric keys and input a number between 1 and 99.
Press the BW/AVG hard key.
Press the Average soft key.
When the averaging reaches to the number set here, a new
measurement value replaces the earliest measurement value
in sequence.
Setting Sweep Mode
SWEEP
This hot key is used to set the sweep parameters. The user input window must be inactive first to get
the Sweep hot key function other than the number input.
SWEEP MODE: Sets the sweep method. Toggle between Continue and Single.
Step Description
Setting Trace and Display
TRACE/DISPLAY
SELECT TRACE: Selects an active trace from T1 to T6. Trace numbers are assigned to each
captured trace or loaded trace. Pressing one of the 6 trace number soft keys sets the selected
trace number as the active trace on the display screen.
SWEEP
[Sweep Mode]
Press the SWEEP hot key. It is the number 1 key in the
numeric keypad.
Press the Sweep Mode soft key. Toggle between
Continue and Single.
13 GSM/GPRS/EDGE SIGNAL ANALYZER
JD7105B Base St at ion Analyzer
CLEAR WRITE: Clears the selected trace and writes or assigns the current trace.
M AX HOLD: Sets the active trace to display the maximum response of the input signal. Active
trace compares newly acquired data with the trace shown on the screen and displays the bigger
trace on the display screen.
MIN HOLD: Sets the active trace to displa y the minimum response of the input signal. Active trace
compares newly acquired data with the trace shown on the screen and displays the smaller trace
on the display screen.
CAPTURE: Captures a current trace on the display screen with the selected trace number.
TRACE VIEW: Displays the trace of the selected trace number on the display screen or hides it
from the display screen. Press the Select Trace soft key to select a trace number and then press
the Trace View sof t key to toggle between the Off to hide and On to restore a hidden trace.
TRACE CLEAR ALL: Deletes all traces from the instrument and initializes the trace settings.
Measurement Example
GSM Spectrum Analysis Measurement Screen
Using Marker
MARKER
Marker is used to get the information about a specific trace. Six markers can be set on the display and
each marker can be used independently. The X and Y coordinates of the trace are displayed when the
GSM/GPRS/EDGE SIGNAL ANALYZER 14
JD7105B Base St at ion Analyzer
marker is placed on any position of the tr ace. The position dis p laying the marker’s X and Y
coordinates may be slightly different for each measurement mode and refer to the description of each
measurement. There are three different marker types available: Normal, Delta, and Delta pair. Marker
position can be set manually by entering numeric values (frequency) when one of the marker types is
selected.
SELECT MARKER: Selects an active marker whose position can be changed with the rotary
knob or the arrow keys. The assigned number of the active marker is displayed in the Select
Marker menu box and the active marker number is also displayed right next to the active marker
on the trace when the Marker View is set to On.
MARKER VIEW: Displays the selected marker on the screen or hides it. When the Marker View
is turned off and then on ag ain in the same measurement mode, markers appear at the previous
positions. If a m eas urem ent mode is changed, markers are not restored to t he ir p r evious posi tio ns .
NORMAL: This Normal marker type provides the reading of a marker position on the trace along
with the marker number between 1 and 6.
DELTA: This Delta marker type is associated with a Normal marker. A Normal marker must be set
before a Delta marker is set. When the Delta marker is set, the position set by the Delta marker
becomes the reference position of the Normal marker and the marker’s X and Y values displays
the difference compared with the Delta marker.
DELTA PAIR: This Delta Pair marker type is associated with a Normal marker. A Normal marker
must be set before a Delta Pair marker is set. When the Delta Pair marker is set, the position set
by the Delta Pair marker becomes the reference position of the Normal marker and the marker’s X
and Y values displays the difference compared with the Delta Pair marker. The reference position
will be varied in accordance with trace change.
MARKER ALL OFF: Turns all the markers the screen off. When the Marker View is selected for
those markers, the instrument displays those markers back at the previous position. If a
measurement mode is changed, current settings are not restored.
MARKER: Sets the X coordinate of the active marker as selected.
MARKERCENTER: Sets the frequency of the active marker to the center frequency of
spectrum analyzer.
MARKERSTART: Sets the frequency of the active marker to the start frequency of
spectrum analyzer.
MARKERSTOP: Sets the frequency of the active marker to the stop frequency of spectrum
analyzer.
15 GSM/GPRS/EDGE SIGNAL ANALYZER
JD7105B Base St at ion Analyzer
Using Peak Search
PEAK SEARCH
Each time the Peak Search soft key is pressed, the active marker is positioned at the highest peak of
the trace.
PEAK SEARCH: Moves the active marker to the highest peak of the trace.
NEXT PEAK: Moves the active marker to the second highest peak of the trace.
NEXT PEAK RIGHT: Moves the active marker to the highest peak to the right of its current
position.
NEXT PEAK LEFT: Moves the active marker to the highest peak to the left of its current position.
MIN SEARCH: Moves the active marker to the lowest peak of the trace.
ALWAYS PEAK : When the Always Peak is set to On, the instrument moves the active marker
automatically to the highest peak of the trace every time the trace is refreshed.
GSM/GPRS/EDGE SIGNAL ANALYZER 16
JD7105B Base St at ion Analyzer
Connect the signal to the Spectrum A naly zer RF In 50Ω
2. Select the mode
1. Set the frequency
2. Select the channel standard
RF ANALYSIS MEASUREMENTS
GSM/GPRS/EDGE Signal Analysis provides the following measurements for RF Analysis.
Channel Power
Occupied Bandwidth
Spectrum Emission Mask
Spurious Emissions
Setting Mode
Step Description
1. Connect the cable
port using the cable whose loss was measured.
MODE
[Signal Analyzer]
[GSM]
[RF Analysis]
Setting Frequency
Step Description
FREQ/DIST
[Center Frequency]
Enter a value
[GHz], [MHz], [kHz], or [Hz]
or
[Channel Number]
Enter a value
[Forward] or [Reverse]
Press the MODE hard key.
Press the Signal Analyzer soft key.
Press the GSM soft key.
Press the RF Analysis soft key.
Press the FREQ/DIST hard key.
Press the Center Frequency soft key.
Use the numeric keys, the rotary knob, or the arrow keys.
When using the numeric keys, the input is completed by
selecting one of the unit soft keys.
Press the Channel Number soft key.
Enter a channel number using the numeric keys.
Select the direction by pressing the Forward or Reverse.
[Channel Standard]
Select a channel standard
[Select] or ENTER
Press the Channel Standard soft key to get the pop-up
window of the channel standard list.
Press the arrow keys, rotate the knob, or press the Page Up
and Page Down soft keys to highlight a frequency band to
select.
Press the Select soft key or the ENTER hard key.
17 GSM/GPRS/EDGE SIGNAL ANALYZER
JD7105B Base St at ion Analyzer
1. Set the reference level
2. Set the attenuation level
FREQ/DIST
This setting is not used in the Spurious Emissions mode.
CENTER FREQUENCY: Changes the center frequency setup. Values can be entered with the
numeric keys, the rotary knob, or the arrow keys. When using the numeric keys, the input is
completed by selecting one of the unit soft keys including GHz, MHz, kHz, and Hz. When using
the rotary knob or the arrow keys, the frequency changes in a predefined frequency step. The
frequency step can be configured by selecting the Frequency Step soft key.
CHANNEL NUMBER: Enters a channel number and selects the Forward or Reverse soft key.
When using the rotary knob or the arrow keys, the channel changes in a predefined channel step.
The channel step can be configured by selecting the Channel Step soft key.
FREQUENCY STEP: Defines the moving step size of the Center Frequency when using the
rotary knob or the arrow keys. The step size can be en ter ed b y using numeric keys and the unit
soft keys.
CHANNEL STEP: Defines the moving step size of the Channel Number when using the rotary
knob or the arrow keys. The step size can be entered by using numeric keys and the Enter soft
key.
CHANNEL STANDARD: When the channel standard is selected from the list, the center
frequency information on the display screen will be mapped accordingly to the selected channel
standard. The channel standards available in the instrument are listed in the table in the Appendix
C – Band, Frequency & Channel Standard.
Setting Amplitude
Step Description
AMP/SCALE
[Reference Level]
Enter a reference level value
[dBm] or ENTER
Press the AMP/SCALE hard key.
Press the Reference Level soft key.
Use the numeric keys or the rotary knob that changes in a 10
dB step.
Press the dBm soft key or the ENTER hard key.
[Attenuation]
<Auto> or <Manual>
Enter an attenuation value
Press the Attenuation soft key. The Auto mode is set by
default. This key toggles between the Auto and Manual.
Press the Attenuation soft key to highlight the Manual mode
and change the attenuation value to optimize S/N.
Use the numeric keys or the rotary knob that changes in a 5
dB step. The attenuation settin g range is 0 to 55 dB.
GSM/GPRS/EDGE SIGNAL ANALYZER 18
JD7105B Base St at ion Analyzer
!
If the input signal level is higher than +30 dBm or higher than the allowable mixer
AMP/SCALE
AUTO SCALE: The instrument can automatically set the scale to the minimum and maximum
values on the Y-axis of the graph for optimum display of the traces measured. Each time the Auto
Scale is selected, the top and bottom scales are set to the minimum and maximum values with
margin on the Y-axis of the display screen.
REFERENCE LEVEL: Sets the maximum Y-axis range when using the Spectrum Analyzer or
Signal Analyzer function.
SCALE/DIV: Is used only for the Spectrum measurement screen. It represents the value of one
division on the horizontal scale. The default value is 10 dB per divis ion and the Y-Scale is set to
100 dB. Selecting the Scale/Div soft key enables to set the value to 1 dB per division with the
numeric keys or the rotary knob.
ATTENUATION
AUTO: Input attenuator’s value is automatically set depending on the reference level. This is
the default operation mode, so it is recommended to use this mode unless a special
measurement condition is needed.
MANUAL: Sets the attenuator’s value for the Spectrum Analyzer RF In 50Ω port. The
reference level changes according to the change of the attenuator’s value, but the
attenuator’s value does not change when the reference level is changed.
input limit per input attenuator’s value set by the user, a “IF Overload” message will
be displayed on the screen indicating that the input attenuation value must be
increased. When the instrument is exposed to an over power condition for a long
time, its performance may be degraded.
PREAMP: Turns on or off the internal pre-amplifier. The pre-amplifier is to amplify a low-level
input signal. This soft key toggles between the On and Off. When it is turned on, the allowable
attenuation input range is 0 dB to 10 dB w ith 5 dB step. If user sets attenuation value beyond 10
dB, then the instrument will automatically turn off pre-amplifier to display low level signal properly
on the screen.
UNITS: Sets the scale unit on the display among dBm, dBmV, dBuV, V, and W.
EXTERNAL OFFSET: Sets an external offset value. An offset consists of a cable loss and a user
offset and the measurement result shows the value reflecting both offset values. When the
external offset value is set at 40 dB in the Spectrum mode, the measurement result compensates
40 dB at both the Spectrum Analyzer and Signal Analyzer modes.
19 GSM/GPRS/EDGE SIGNAL ANALYZER
JD7105B Base St at ion Analyzer
1. Set the averaging
2.
3. [Enter] or ENTER
Press the Enter soft key or the ENTER hard key.
Setting Averaging
BW/AVG
AVERAGE: Sets the number of measurements to be averaged for the trace presentation. A
maximum of 99 times of averaging can be set.
Step Description
BW/AVG
[Average]
Enter number of averaging to set Use the numeric keys and input a number between 1 and 99.
Press the BW/AVG hard key.
Press the Average soft key.
When the averaging reaches to the number set here, a new
measurement value replaces the earliest measurement value
in sequence.
Setting Sweep Mode
SWEEP
This hot key is used to set the sweep parameters. The user input window must be inactive first to get
the Sweep hot key function other than the number input.
SWEEP MODE: Sets the sweep method. Toggle between Continue and Single.
Setting Trigger Source
TRIGGER
This hot key is used to select the trigger source among RF Burst, Internal FB, RF Burst & TS,
External, and Free. It is the same number 4 key in the numeric keypad functioning when the value
input bar on the screen is inactive.
Step Description
1. Set the sweep mode
SWEEP
[Sweep Mode]
Press the SWEEP hot key. It is the number 1 key in the
numeric keypad.
Press the Sweep Mode soft key. Toggle between
Continue and Single.
GSM/GPRS/EDGE SIGNAL ANALYZER 20
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RF BURST: Sets the trigger level when using the RF Burst (wideband) trigger. The value is
relative to the peak of the signal. RF Burst is also known as RF Envelope.
INTERNAL FB (FREE BURST): Sets the trigger level to FB if there is a frequency burst signal.
RF BURST & TS (TRAINING SEQUENCE): Sets the trigger level to Training Sequence Code.
EXTERNAL: Sets the trigger level to external trigger reference.
FREE: Sets the free trigger (auto trigger).
21 GSM/GPRS/EDGE SIGNAL ANALYZER
JD7105B Base St at ion Analyzer
1. Connect the cable
Connect the cable to the S pectrum A naly zer RF In 50Ω
3. Set the measurement parameters
CHANNEL POWER
The Channel Power measures in-channel power for GSM/GPRS and EDGE systems. GSM/GPRS
and EDGE systems use dynamic power control to ensure that each link is maintained with minimum
power. It gives two fundamental benefits of keeping overall system interference to a minimum level
and of maximizing battery life in the case of mobile stations. The Channel Power measurement
determines the average power of an RF signal burst at or above a specified threshold value. The
threshold value may be absolute or relative to the peak value of the signal.
The purpose of the Channel Power measurement is to determine the power delivered to the antenna
system on the RF channel under test. The instrument acquires a GSM/GPRS or EDGE signal in the
time domain. The average power level above the threshold is then computed and displayed.
Measurement Procedure
Step Description
2. Set the measurement mode
MODE
[Signal Analyzer]
[GSM]
[RF Analysis]
[Channel Power]
MEASURE SETUP
[Delay]
Enter a value
[uSec] or ENTER
[RX Filter]
[No Filter], [100K], [200K],
[400K (Default)], or [624K]
GSM Channel Power Measurement Procedure
port of the JD7105B and the RF Output port of BTS.
Press the MODE hard key.
Press the soft key to select the Signal Analyzer mode.
Press the GSM soft key.
Press the RF Analysis soft key.
Press the Channel Power soft key.
Press the MEASURE SETUP hard key.
Press the Delay soft key to set the delay.
Use the numeric keys to input value.
Press the unit soft key or the ENTER hard key.
Press the RX Filter soft key to select the internal RX filter
bandwidth among the choices.
MEASURE SETUP
DELAY: Sets the delay in micro seconds. Use the numeric keys to input value and press the unit
soft key to complete the input.
GSM/GPRS/EDGE SIGNAL ANALYZER 22
JD7105B Base St at ion Analyzer
1. Select the limit mode
2. Set the limit
RX FILTER: Sets the internal RX filter bandwidth among 100K, 200K, 400K, and 624K. Default
setting is 400K.
Setting Limit
LIMIT
This hot key is used to set the threshold value for the limit line on the display screen. It turns on or off
the limit or band limit settings of the measurement for pass/fail indication. The user input window must
be inactive first to get the Limit hot key function other than the number input.
Step Description
LIMIT
[RF Test Limits]
[Channel Power]
[Test Limits]
<On> or <Off>
[High Limit]
Enter a value
[dBm] or ENTER
[Low Limit]
Enter a value
[dBm] or ENTER
3. Enable beep
LIMIT
[Beep]
<On> or <Off>
Press the LIMIT hot key. It is the number 7 key in the
numeric keypad.
Press the RF Test Limits soft key to enable or disable
test limits on RF Analysis measurements.
Press the Channel Power soft key.
Press the Test Limits soft key to toggle between On and
Off and select one.
Press the High Limit soft key to set the upper limit of the
Pass/Fail criteria. Use the numeric keys to input value.
Press the unit soft key or the ENTER hard key.
Press the Low Limit soft key to set the lower limit of the
Pass/Fail criteria. Use the numeric keys to input value.
Press the unit soft key or the ENTER hard key.
Press the LIMIT hot key. It is the number 7 key in the
numeric keypad.
Press the Beep soft key to toggle between On and Off
and select one. This will make audible alar m if the
measurement beyond the limit.
TEST LIMITS: Enables or disables Pass/Fail results on the display screen. Toggle the Test
Limits soft key to select it to On or Off.
HIGH LIMIT : Sets the upper limit of the Pass/Fail criteria. Use the numeric keys to enter a
threshold or limit value and press the dBm unit soft key or the ENTER hard key to complete the
input.
LOW LIMIT: Sets the lower limit of the Pass/Fail criteria. Use the numeric keys to enter a
23 GSM/GPRS/EDGE SIGNAL ANALYZER
JD7105B Base St at ion Analyzer
threshold or limit value and press the dBm unit soft key or the ENTER hard key to complete the
input.
Measurement Example
GSM Channel Power Measurement Screen
Using Marker
MARKER
Marker is used to get the information about a specific trace. Six markers can be set on the display and
each marker can be used independently. The X and Y coordinates of the trace are displayed when the
marker is placed on any position of the trace. The position displaying the marker’s X and Y
coordinates may be slightly different for each measurement mode and refer to the description of each
measurement. There are three different marker types available: Normal, Delta, and Delta pair. Marker
position can be set manually by entering numeric values (frequency) when one of the marker types is
selected.
SELECT MARKER: Selects an active marker whose position can be changed with the rotary
knob or the arrow keys. The assigned number of the active marker is displayed in the Select
Marker menu box and the active marker number is also displayed right next to the active marker
on the trace when the Marker View is set to On.
MARKER VIEW: Displays the selected marker on the screen or hides it. When the Marker View
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