High-Speed Tester for NADC/PDC/PHS
MS8604A
Digital Mobile Radio Transmitter Tester
100 Hz to 8.5 GHz
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Burst Modulation Accuracy Measured
in Under ONE Second
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The MS8604A is a full-featured digital mobile
transmitter tester for evaluating the major
characteristics of transmitters used in the
North-American Digital Cellular Systems
(NADC), Japan's digital mobile telephone
(PDC: Personal Digital Cellular) system and
by cordless telephones (PHS: Personal
Handy Phone System). It covers frequencies
from 100 Hz to 8.5 GHz, and measures spurious emissions over a broad frequency range.
It can also measure RF signals directly up
to 10 W (average burst power) and baseband devices can be evaluated using its
I/Q signal input function (option).
The MS8604A is ideal for high-speed
measurement of frequency deviation,
spurious emissions, occupied bandwidth,
antenna power, leakage power during
carrier-off, transmission ramp-up and rampdown power, modulation accuracy, leakage
power of adjacent channel, and signal transmission rate of digital mobile transmitters.
In addition to measurements conforming
to EIA/TIA, ETSI, RCR, and MKK standards,
DSP (digital signal processing) and highspeed measurement function based on a
unique measurement algorithm combine to
greatly reduce the time required for manufacturing and inspecting transmitters.
PTA functions enabling free programming
of test procedures are provided as a
standard feature.
• Major transmitter functions evaluated
by single system
• Compatible with NADC/PDC/PHS
systems (compatibility with single
system provided as standard; optional
expansion to all three systems)
• High-speed measurement (under 1
second for modulation-accuracy
measurements)
• Input up to 10 W (internal 20 dB
attenuator and power meter for high
power levels)
• Superior operability
• I/Q signal input (option)
Fast, Accurate Measurement of
Digital Modulated Signals
A unique high-speed measurement method
is available for measuring occupied bandwidth and leakage power of adjacent
channel in addition to RCR (Research &
Development Center for Radio Systems)
standards and Specifications for the type
approval test of the Ministry of Posts and
Telecommunications of Japan. For RCR
standards, a spectrum analyzer is used to
determine the occupied bandwidth and
leakage power of adjacent channel from
the burst signal frequency spectrum.
In this method, frequency sweeps must be
performed slowly to obtain an accurate
burst wave spectrum, so measurement
speed falls. For example, more than 10
seconds are required when measuring PDC.
With Anritsu's unique measurement method,
digital signal processing is used to compute
the frequency components from a single
burst signal waveform, and the occupied
bandwidth and leakage power of adjacent
channel are computed from the results.
Measurement times of 2 seconds and less
are possible for PDC transmitters.
Unique High-Speed Measurement Method
MS8604A
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Evaluation of Digital Mobile Transmitters
Automated Measurement by Simple key Operations
Quick Configuration for Different
Communication Systems
Measurement software for one communication system
is provided as a standard feature; others can be added
as options. When these options are chosen, the
communication system can be selected by pressing
a single key.
Measurement of Frequency, Modulation
Accuracy, Signal Transmission Rate
Both absolute frequencies and deviations can be read
directly. Measurement of modulation accuracy includes
both vector errors within burst signals, amplitude errors,
phase errors, origin offset and droop factors, and
vector errors for first ten symbols immediately following
startup. Ten-burst averages and signal transmission
rates can also be measured.
Measurement of Antenna Power and
Leakage Power during Carrier-Off
At measurement of burst signal antenna power, the
power-on intervals are auto-detected based on the
modulated wave, so an external synchronization trigger
is not needed. In addition, the average power during
power-on intervals is automatically matched to a template value, simplifying measurement automation. Any
template can be set, and three types can be stored.
The leakage power during carrier-off can be measured
as either an absolute value or as an on/off ratio.
When the carrier-off power is low, measurements can
be performed in a wide-dynamic-range mode (during
single-mode measurements with synchronizing word).
One-Touch Selection of Measurement Items
Measurement items can be selected by pressing a single
key. The input connector (RF/IQ), maximum input power,
and type of signal for measurement (uplink/downlink,
number of slots per carrier, channel number/frequency,
frequency steps, synchronizing words, root Nyquist filter
switching) can be preset. In particular, synchronizing
words can be predefined to any value. Measurement
can be performed in either the single-measurement
mode (one measurement performed each time key
pressed), or in the automatic continuous repeat mode.
Example of burst rise characteristics (PHS)
NORMAL mode
WIDE DYNAMIC
RANGE mode
Measurement of Transmission Ramp-up
and Ramp-down Power
Transmission ramp-up and ramp-down power can be
measured simultaneously with antenna power measurements. In addition, the marker points can be moved and
the marker point symbol power can be read directly.
Measurement of Leakage Power of Adjacent Channel
Users can select either a standard mode using
spectrum-analyzer methods, or a high-speed mode to
reduce measurement time.
Measurement of Occupied Bandwidth
Users can select either a standard mode using
spectrum-analyzer methods, or a high-speed mode to
reduce measurement time.
Measurement of Spurious Emissions
Up to 15 spurious measurement frequencies can be
stored in one memory table and three memory tables
are provided. In addition, a function is provided for
automatic measurement of the highest level within
a ±500 kHz range of a specified frequency. By using
spectrum-analysis functions, spurious emissions can be
detected over a wide frequency range.
• Measurement Times
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Measurement item NADC PDC PHS
Frequency, modulation accuracy
#1s
(simultaneous)
approx. 9s (fixed frequencies),
Spurious emissions (15 specified) approx. 9s (fixed frequencies),
approx. 25s (search within
waves) approx. 40s (search within 6500 kHz)
6500 kHz)
Occupied bandwidth —
approx. 12s (standard mode), approx. 4s (standard mode),
#1s (high-speed mode) #1s (high-speed mode)
Antenna power, leakage power during
carrier-off, transmission ramp-up and #1s
ramp-down power (simultaneous)
Leakage power of adjacent channel #2s
approx. 13s (standard mode, approx. 5s (standard mode)
#1.5s (high-speed mode) #1.5s (high-speed mode)
Signal transmission rate #3s #2s
Note: Measurement times are for continuous measurement under identical conditions and settings.
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The modulation error can be found by connecting the
I/Q vector components of symbol points.
Intervals between symbol points are smoothly
interpolated for dynamic observation of the movement
of I/Q vector components.
Constellation Display Function
The I/Q vector components of measured signals are
displayed as symbol points. The frequency error,
RMS/PEAK vector error, and origin offset can also be
displayed on the same screen.
Scaled Modulation Error Display
The modulation error scale can be switched between
5%, 10% and 20%, and can be displayed for each
symbol point—a useful feature when making decisions
on modulation accuracy.
For High-Speed Analysis of Digital Modulated Waveforms
Convenient for Real-time Analysis of RF, IF, I/Q Signal Constellation, Evaluation
and Adjustment of Modulation Circuits
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