Signal Sources
2026Q CDMA Interferer Multisource Generator
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• Two tone interference generation for
AMPS/CDMA receiver testing in accordance with IS-97-A/IS-98-A
• Option for providing GSM signals for
receiver and amplifier testing
• Combiner output frequency range from
800 MHz to 2.0 GHz
• Provides single calibrated point of reference for the transceiver under test
• Excellent phase noise and spectral purity
• Elimination of additional RF combining or
signal conditioning
• High internal isolation of returned signals
• Includes two independent, fully featured
RF signal generators 10 kHz to 2.4 GHz
• Very low levels of internally generated
intermodulation products
• Single unit solution for CDMA interference testing
Calibrated and Combined Signal Path
It is designed to produce a fully calibrated combined RF output containing any mix of internally generated interference signals from its
two RF sources, together with a calibrated signal path for a radio test
set transmit output. A return path from the transceiver back to the
radio test set receiver input is also provided through the instrument
as illustrated in figure 1.
This allows a CDMA receiver to be tested for sensitivity in the presence of single or dual tone interference. The interfering signals are
combined without the need for any RF switching mechanism that
would otherwise affect the test result.
Option 116 allows the 2026Q to provide GSM modulated signals for
receiver or amplifier testing with low floor noise characteristics.
High Isolation
2026Q is configured to ensure high levels of isolation between each
of the transmit and receive paths between the radio test set, the
interfering signal sources and the transceiver under test.
The 2026Q is a derivative of the popular 2026
MultiSource RF signal generator. It has been
designed to work directly with a CDMA radio test
set to produce a fully integrated radio receiver
test solution for CDMA cellular and PCS systems
in accordance with IS-97-A/IS-98-A.
For the very latest specifications visit www.aeroflex.com
Figure 1 : 2026Q configured for radio testing with a test set
Path loss test data is supplied with each instrument for the frequency bands 865 MHz - 895 MHz, 1750 MHz - 1990 MHz. Drift influences within these bands is minimal ensuring a level accuracy of better than ±0.75 dB. The frequency response across each of these
bands is flat to within ±0.1 dB, thus minimizing the need for additional system calibration.
Independent Signal Generators
Each of the RF generators contained within 2026Q may be used independently, routed to their individual RF connectors. In this mode,
each generator covers the full frequency range 10 kHz to
2.4 GHz with an output power of between -137 dBm and +24 dBm.
Each source may be independently modulated either from an internal
or external source(s). Modulation modes include AM, FM, PM,
Pulse and 2/4 level FSK. The standard 2026 specification applies
when used in this mode.
Excellent Spectral Purity
Very low phase noise and spurious responses are achieved making
them ideal for CDMA handset interference tests and other general
purpose applications. The 2026Q has a low residual FM of typically
3 Hz and typical sideband noise of -121 dBc/Hz at 20 kHz offset from
1 GHz.
The excellent noise floor performance is more than adequate for
mobile handset and base station testing.
Setting up the source and combiner routing
The flexibility of the signal routing allows the 2026Q to accept an
external input from another signal generator, such as the 2050 Digital
and Vector Generator producing CDMA modulation or a radio test
set.
Automatic Source Coupling
The two internal generators can have their frequency and level ‘coupled’. In the case of RF level this coupling can be any fixed offset
enabling control of a single parameter to manifest a change in both
sources. For RF frequency this coupling can be both a fixed frequency offset or a harmonically related offset and again allow simple programming and control of the instrument.
Typical SSB Phase Noise at 1 GHz
Typical Phase Noise at 20 kHz offset
Flexible Source Routing
Each of the signal sources can either be routed to a separate output
connector or switched to the input of an RF combiner network before
being fed to the combiner output connector. The combiner routing
is set up quickly and effectively using the Combiner Set Up menu.
Setting up coupling
Sweep
The 2026Q allows either of the independent RF sources to be frequency swept with user defined start, stop, and step values to reduce
the amount of operator time or GPIB overhead. By enabling the coupling facility, sweeping one source will simultaneously sweep the
other internal RF source to allow automated swept measurements on
frequency conversion devices to be made.
High RF Output
Each of the RF signal generators is able to deliver up to +24 dBm at
their output, making them ideal for testing components such as mixers and amplifiers etc.
Comprehensive Modulation
Each signal source is capable of being independently modulated from
its own fully programmable modulation source to ensure maximum
flexibility. The internal modulation sources are each capable of generating sine, triangle or square wave signals.
Amplitude, frequency and phase modulated carriers can be generated from the internal modulation sources or from the independent
external inputs.
The frequency modulation system provides excellent performance in
the DC coupled mode with very low carrier frequency error and stability ensuring that the generator can accurately test receivers sensitive to small frequency errors.
Programming
A GPIB interface is fitted so that all standard signal generator functions are controllable over the bus. The protocol and syntax of GPIB
commands has been designed in accordance with IEEE 488.2 standard to facilitate the generation of ATE programs.
A RS-232 interface is fitted as standard with a common command set
to GPIB commands. RS-232 control is particularly suitable for use
with simple external controllers or RF modems when the instrument
is being used in a remote location.
Low Cost of Ownership
An electronic trip protects the individual source outputs against the
accidental application of reverse power.
Careful attention to the thermal design and the use of well-proven
signal generator modules gives high reliability and calibration validity.
The use of flash memory and software download via the RS-232 interface means the 2026Q can be upgraded with its covers fitted.
Option 116 - GSM Modulation
Option 116 is avaialble to allow 2026A/B to emulate GSM signals
using FM techniques which achieves superior noise floor performance than solutions using IQ systems. The facility is ideal for testing
GSM receiver selectivity and for testing the linearity of high performance multi-carrier power amplifiers.
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The 2026Q CDMA Interferer MultiSource Generator is a purpose built
instrument for testing CDMA hand-set and base station equipment. It
features two synthesized RF signal generators with both independent
and combined RF outputs. The combined RF output provides a path
to and from the radio under test and an appropriate CDMA radio test
set. Each signal source covers the frequency range 10 kHz to 2.4
GHz, whilst the combined path covers the range
800 MHz to 2.0 GHz.
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Independent source frequency range
10 kHz to 2.4 GHz with a resolution of 1 Hz
Combined output frequency range
800 MHz to 2.0 GHz with a resolution of 1 Hz
Accuracy
As frequency standard
Combiner outputs
-137 dBm to -3 dBm
Maximum output is reduced by 5 dB when pulse modulation is selected and/or by up to 6 dB when AM is selected dependent upon AM
depth.
Resolution
0.1 dB or 3 digits for linear units
Accuracy (Individual RF outputs)
(over temp range 17 to 27°C)
RF Level -127 dBm to -100 dBm to >+6 dBm
Up to 1.2 GHz ±1.0 dB ±0.8 dB ±1.0 dB
Above 1.2 GHz ±1.6 dB ±1.6 dB ±2.0 dB
Temperature Stability
Up to 1.2 GHz <±0.02 dB/°C
Above 1.2 GHz <±0.04 dB/°C
Accuracy (Combined RF output)
(over temp range 17 to 27°C and level range -20 dBm to -35 dBm)
RF Frequency range Level Accuracy
865 MHz - 895 MHz ±0.75 dB
1750 MHz - 1990 MHz ±0.75 dB
Attenuator hold
Inhibits operation of the step attenuator from the level at which the key
is enabled. Useable for a level reduction of at least 10 dB. Typical
accuracy ±3 dB.
VSWR
Individual outputs
For output levels less than -5 dBm, output VSWR is less than 1.5:1 for
carrier frequencies up to 1.2 GHz and less than 1.7:1 for carrier frequencies up to 2.4 GHz.
Path Loss
( X → Y)* 14 dB typ. 15 dB typ.
( Y → Z) 13.5 dB typ. 13.5 dB typ.
( Y → X) >40 dB > 40 dB
* -measured values are supplied with each instrument with a frequency
response of <± 0.1 dB across the frequency bands
865 MHz to 895 MHz, 1750 MHz to 1780 MHz and 1930 MHz to
1990 MHz. Measurement uncertainty of ± 0.25 dB applies.
Options are available providing lower path loss figures - please contact
your IFR sales office for further details.
VSWR (refer to Figure 1)
(1)
-100 dBm +6 dBm
865 MHz to 895 MHz 1750 MHz to 1990 MHz
865 MHz to 895 MHz 1750 MHz to 1990 MHz
(2)
to +24 dBm
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Range
Individual outputs
-137 dBm to +24 dBm
For the very latest specifications visit www.aeroflex.com
(1)
Port X <1.2:1 <1.35:1
Port Y <1.6:1* <1.6:1*
Port Z <1.35:1 <1.35:1
*Typically <1.25:1
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