Description

4945C Radio Communications Test Set (300kHz～3GHz)

4945B/C Radio Communications Test Set, which is a multifunctional and portable model based on software radio architecture, integrates plentiful functions, like frequency-hopping signal generation and analysis, vector signal generation and demodulation analysis, analog modulation signal generation and demodulation analysis, audio signal generation and analysis, audio oscilloscope, automatic testing and so on. The test set is capable of major performance testes on transmitting and receiving of radio communication equipment, measurement and analysis on feature parameters of RF, modulation, audio, and digit etc. Wide applications of the test set cover R&D, production, verification, maintenance and repair, and tests on radio communication equipment, including short-wave / ultra short-wave radio stations, data link systems, communication and surveillance satellites, radio relay equipment. Military mobile carriers with radio communication terminals like communication vehicles, surveillance vehicles, vessels and ships, as well as external field tests can use this test set conveniently.

Main Characteristics

• Multiple RF testing functions: sweep spectrum analysis, broadband and narrow band power measurement, frequency error measurement, RF signal source;
• Analog standard communication test: AM, FM, SSB signal generation and demodulation analysis. Equipped with graphic display of demodulation audio, SINAD, SNR, distortion degree, modulation rate and other measurement functions and a built-in speaker which outputs demodulation voice in real-time. Modulation signal generator and modulation source support external audio and microphone;

• Digital standard communication test (option): 10MHz bandwidth digital vector signal generation and analysis, bit error rate measurement, with real-time output interface of digital demodulation;
• Frequency-hopping test (option): 60MHz transient bandwidth frequency-hopping signal generation and analysis. Frequency-hopping analysis supports measurements types like waterfall chart and frequency-time. Single capture lasts 1.3s at the bandwidth of 60MHz and the time resolution is 10ns;
• Audio signal testing: audio signal generation and analysis, the max. audio input level reaches 30Vrms (high impedance), the max. audio output level reaches 7Vrms (high impedance); capable of measurements on frequency, level, SINAD, SNR and distortion degree; audio generation supports dual-tone output; individual adjustment is available for dual-tone frequency and amplitude, phase is adjustable relatively;
• Dual-channel oscilloscope (option): DC～4MHz；
• Auto test software: on-line editing of DUT (device under testing) parameters, auto pilot testing, yield of test reports and other functions. The PTT control interface regulates transmitting and receiving of DUT;
• Built-in attenuator with high power: the max. input power is as high as150W;
• Portable structure: external size (without handles): 426 (W)×222 (H)×180 (D)mm, easy for carry-on and application;
• Diversified power supply modes: the standard configuration supports AC220V or DC24V, built-in lithium-ion battery is available;
• Support network interface programming control;
• 4 inch large screen, resistor touch screen, English/Simplified Chinese interface, interface colors are free for your choice;
• Support simultaneous operations on multi-function windows, up to 4 windows can be operated at the same time.

Auto testing functions of radio communication equipment

Can create and edit models, parameters and qualified specification limits of DUT. Choose your DUT and connect test cable, the comprehensive test set will automatically conduct the test. It controls transmitting and receiving of the DUT by PTT. When the DUT needs setup or the cable needs being changed, the test set will automatically halt the test and indicate further operation. The test goes on after the operation is finished. Qualified and unqualified items will be listed directly. Other functions, like storage, viewing, comparison and remote readout, are also available.

Transmitter test

It can conduct simultaneous tests on various performance specifications of transmitters, like signal power, frequency error, signal modulation characteristics, audio demodulation, and so on. Audio signals of transmitters can be provided and single/double tones are available for your choice. It  can simulate pilot signals.

Receiver test

It’s able to send out FM, AM and SSB RF signals; analyze audio demodulation of the receiver; measure accurately audio frequency, voltage, distortion degree, SINAD and SNR.

Function as a RF signal generator

Analog modulation of FM, AM, SSB etc., and digital modulation of BPSK, QPSK, 8PSK, GMSK, 16QAM and so on can all be output. The max. symbol rate of digital modulation is 5MHz. The test set upholds generation of 60MHz transient bandwidth frequency-hopping signals.

RF receiving and demodulation

The test set is capable of demodulation and analysis of analog modulation like FM, AM, SSB etc., and that of digital modulation signals including BPSK, QPSK, 8PSK, GMSK and 16QAM. Demodulated parameters and waveforms can be output. The max. demodulated bandwidth of analog modulation signals reaches 300kHz and the max. symbol rate of digital modulation and signal demodulation is 5MHz. Narrow band power measurement is available.

Sweep spectrum analysis

It enjoys wide frequency band, high resolution, high sensitivity, big dynamic range and other characteristics.

Frequency-hopping signal analysis

The max. transient analysis bandwidth of frequency-hopping signals is 60MHz. The display types are three-dimensional spectrum graph, time-frequency graph and time-amplitude graph. The test set can capture, store and analyze frequency-hopping signals. You can view spectrum and modulation domain graphs at any time. When modulation domain measurement is in progress, it is capable of accumulation and display of frequency points within any time frames. Frequency-hopping points can be observed directly. Pulse signals and transient signals can also be measured.

Audio signal generation

Single and double tones are available for your choice. The max. output level reaches 7Vrms

Audio signal analysis

Audio filter is optional. The max. input level is up to 30Vrms. The test set supports measurements on frequency, level, distortion degree, SINAD and SNR, as well as audio waveform display.

Simultaneous operation on multiple windows

Support simultaneous operation of 4 windows at most, each window can be enlarged individually.

Typical Applications

4945B/C Radio Communications Test Set is extensively employed due to the powerful functions and performances, which is used for R&D, repair, maintenance and test of communication equipment.