Viavi 8800SX User manual
1© 2018 VIAVI Solutions Inc.viavisolutions.com
Basic Interconnects
Interconnect 1 – Basic Transmitter/Receiver tests
For basic Transmitter and Receiver
tests, connect the 8800SX TR port
to the Radio ANT port.
RF Test cable
The TR port on the 8800SX is a bi-directional RF port that can generate a signal
to test a receiver as well as measure transmitter characteristics like Power,
Frequency and Modulation. This port is rated at 50 Watts input. Measurements
to 125 Watts are possible observing duty cycle to prevent overheating.
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Access to built-in presets
•The small tab at the top center of the
display allows access to the launch bar.
•Simply touch the tab and the launch bar
will expand.
•Press the Utilities tab
and then the Presets
menu to rapidly
configure the 8800SX
for either Analog or
Digital testing.
Presets quickly configure
standard tile selections and
locations.
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Access to built-in setup files
•Setup files store complete instrument
configurations that include all settings.
•To open the menu, simply touch the tab
and the menu will expand.
•Press the Utilities tab
and then the
Store/Recall item to gain
access to the pre-
configured test setups
that are within every
instrument.
Every 8800SX is pre-configured
with a large group of sample
setups to configure the instrument
for a variety of basic tests.
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The Sample Setups
•After entering the Sample Setups
folder, there are a variety of basic test
folders available.
•This presentation will show some of
the ones available for FM and AM
transceiver testing.
•Highlight the Analog FM folder and
press the icon to enter the folder.
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Measure TX Frequency and Power
1. Zero the Power Meter.
2. Connect the transmitter as illustrated
on slide 1.
3. Enter the transmitter frequency on the
Receiver Tile.
4. Key the transmitter.
5. Measure and record the RF Error. This
is the transmitter frequency error.
6. Measure and record the RF Power Avg
reading. This is the Transmit Power
level.
Always Zero the Power Meter
before taking power
measurements.
8© 2018 VIAVI Solutions Inc.viavisolutions.com
Improving the power measurement
•If the loss of the test cable is known, the
Power Meter can be compensated by that
amount by entering the cable offset value as
a negative number on the Expanded
Receiver tile.
•After entering this offset, the transmitter
output now reads 3.26 watts. This radio had
been configured to transmit at 3.2 Watts in
this frequency band.
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Measure Modulation (Basic Check)
A basic transmitter modulation check can be
done after making the following changes to
the current setup.
1. Press the Home button on the 8800SX
front panel.
2. Press the Speaker control to enable the
speaker.
3. Press the Home button again to minimize
the menu.
4. Note that Audio Volume and Squelch
controls are also available on this menu.
These may need to be adjusted later as
necessary.
Home Button
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Measure Modulation (Basic Check)
•Key the transmitter under test and
speak into the radio microphone.
•Audio should be heard in the 8800SX
speaker.
•Voice modulation should be visible on
the Oscilloscope.
•Modulation value should be visible on
the Modulation Meter.
•For AM Modulation testing, change
the Demod value on the Receiver Tile
from FM to AM.
To measure sub-audible tones, set
the AFBW value to 300 Hz LP to filter
out audio signals above 300 Hz.
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Measure Modulation (Advanced Check)
•To externally modulate the transmitter
with a tone, connect the 8800SX Audio
Out Port to the radio’s Microphone input.
•The AF Gen Tile can then be used to
apply a tone to modulate the transmitter.
•Additional testing of Transmitter
distortion and microphone sensitivity can
now be performed.
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Measure Modulation (Advanced Check)
•With the radio keyed and connected
as shown in the previous slide,
additional measurements can be
made.
•Enable the AF Gen and adjust the AF
Gen Level to achieve the desired
modulation results.
•Measure the transmitter distortion.
•Turn the AF Generator OFF when
testing is complete.
•Note: The RF Generator must not be
enabled when doing this test.
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Additional signaling formats
•Expanding the AF Generator Tile
reveals a number of other signaling
formats that can be used instead of a
steady state tone.
•The tabs on the side can be used to
access:
•Two Tone
•Tone Remote
•Tone Sequential
•Each selection will reconfigure the tile
for the selected operation.
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Basic Receiver Test
•On the Audio Config Tile, select the Fast Stack icon
to reveal the Modulation Tile.
•The default setting for this setup is modulation at a 1
kHz rate at 2.5 kHz deviation. Both values may be
modified as necessary.
•Pressing the Expand icon reveals a second
modulator that may be used in addition to the first.
The two tones will be summed and applied to the
generator modulator.
•Audio should now be heard from the receiver under
test. The radio’s volume and squelch settings may
need to be adjusted.
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