All-in-One Test Signals for Analog/Digital Narrowband Radio Launch of MG3740A Analog Signal Generator.
Anritsu Corporation (President Hirokazu Hashimoto) announced the launch of its new MG3740A Analog Signal Generator on 21 November to complete the company's signal generator product lineup.
The MG3740A outputs the test signals required to evaluate the performance of narrowband analog radio*1 equipment used by both public services, such as the police and fire departments, and by commercial businesses, like taxi operators.
As a replacement for the older MG3641A/42A synthesized signal generators, it has the world-class SSB phase noise performance*2 of its predecessors, which is important in evaluating narrowband analog radio equipment, and also outputs high-purity test signals.
Moreover, adding the jointly-developed built-in digital modulation*3 option supports output of digital modulations signals too. As a result, one MG3740A supports dual-mode narrowband radio for both analog and digital communications by outputting test signals.
Additionally, it can be configured optionally with two sets of output ports, supporting both the wanted*4 and interference*5 waveform tests required by analog radio standards, as well as the amp*6 intermodulation*7 performance evaluations requiring two test signals.
With this new release, Anritsu expects to help deployment of narrowband public/commercial radio systems supporting both analog and digital communications.
Narrowband analog radio has long been used by various public and commercial services, like disaster prevention radio, police and fire departments, and taxi operators. Consequently there is both replacement and new demand for signal generators to use as signal sources for performance evaluation.
Additionally, the spread of digital technology seems likely to increase the use of dual-mode narrowband radio equipment supporting both analog and digital technologies.
As a result, signal generators for use in this field require both excellent SSB phase noise performance for outputting high-purity test signals, as well as support for digital modulation.
Anritsu developed its new MG3740A to meet these needs as the successor to the earlier MG364xA generation of synthesized signal generators.
Like the MG364xA, the MG3740A has world-class SSB phase noise performance as well as a built-in option to add output of digital modulation signals. As a result, one MG3740A can be used as a test signal source for dual-mode radio equipment supporting both analog and digital communications.
The MG3740A Analog Signal Generator is designed to output the test signals required for evaluating the performance of public and commercial narrowband analog radio equipment.
As an index of its test signal purity, the SSB phase noise is –140 dBc/Hz*8, demonstrating world-class performance as a narrowband analog radio signal source. Adding the jointly developed built-in optional Digital Modulation Function outputs digital modulation signals, enabling the all-in-one MG3740A to output all the test signals required by digital, dual-mode, and analog radio equipment.
Moreover, the MG3740A can be optionally configured with two sets of test signal outputs for simultaneous output of two test signals.
■ Outputs Optimized Test Signals for Narrowband Analog Radio Evaluations
Performance evaluation results for analog radio equipment are heavily impacted by the SSB phase noise performance of the test signal generator. The excellent –140 dBc/Hz (nominal value, 100 MHz center frequency*9, 20 kHz offset frequency*10) performance of the MG3740A avoids such problems. Additionally, the MG3740A outputs the standard analog modulation signals required by analog radio standards, making it the ideal signal source for evaluating the performance of public and commercial narrowband analog radio equipment.
■ Expansion to Digital Modulation Signal Generator
Although the MG3740A operates as a signal source for analog radio performance evaluation, including the built-in Digital Modulation Function option, adds output of digital modulation signals to support dual-mode analog/digital systems now as well as future-proofing against equipment costs when the switch to full digital radio is completed.
■ Expansion to Two Sets of Test Signal Outputs
The analog radio standards require tests using wanted and interference waveforms, and evaluation of radio amplifiers also requires two test signals as does analog radio performance evaluations. Adding the option to build-in two sets of test signal output ports the MG3740A, supports output of two test signals while eliminating the cost and space requirements for two separate signal generators.
[Target Markets and Applications]
■ Target Markets: Radio and electronic parts makers
■ Applications: R&D, manufacturing and maintenance of public/commercial radio equipment and general purpose electronic parts (amps and mixers)
*1 Narrowband Analog Radio
Analog radio equipment using bandwidth between several kHz to 20 or 30 kHz
*2 SSB Phase Noise
SSB means Single Side Band. As a principle of signal generation, side bands always include surplus noise components.
*3 Digital Modulation
Digital radio systems convey information by conversion to electrical signals. Digital modulation is the process of superimposing the converted electrical signal onto the carrier wave.
*4 Wanted Waveform
This is a measurement channel signal for evaluating the receive characteristics of the radio equipment.
*5 Interference Waveform
When evaluating the receive characteristics of the radio equipment, sometimes the measurement target channel signal may be another signal interfering with communications.
Amplifier circuits in radio systems increase the energy in the output signal to greater than the energy of the input signal.
When two signal frequencies are input to an amp, etc., the signal output from the amp contains harmonic components in addition to the fundamental frequency components of the two input signals. Additionally, the modulation caused by these harmonic components and the two input fundamental frequencies is called intermodulation. Intermodulation causes unwanted signals at frequencies that are extremely close to the fundamental frequency components, adversely impacting communications quality.
Unit of phase noise expressing the ratio of the noise to the carrier signal per Hz
*9 Center Frequency
Frequency of measured signal
*10 Offset Frequency
Value expressing degree to which frequency is offset from wanted frequency
Anritsu Corporation (www.anritsu.com) has been a provider of innovative communications solutions for more than 110 years. The company's test and measurement solutions include wireless, optical, microwave/RF and digital instruments, operations support systems and solutions that can be used during R&D, manufacturing, installation, and maintenance. Anritsu also provides precision microwave/RF components, optical devices, and high-speed devices for design into communication products and systems. With the addition of OSS monitoring solutions it has expanded its offering to provide complete solutions for existing and next-generation wireline and wireless communication systems and service providers. Anritsu sells in over 90 countries worldwide with approximately 4,000 employees.
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