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VM-7
RF Attenuation Measurement |
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| Key Features |
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The TEGAM Model VM-7 offers users great flexibility in configuring a measuring system cost-effectively. Since the VM-7 is a 30 MHz receiver, it may be easily adapted to any frequency range with the addition of an appropriate external mixer and local oscillator.
Advanced Techniques
The Model VM-7 uses advanced digital and analog techniques in a series IF substitution configuration, offering a dynamic range in excess of 100 dB. The unit is also fully bus controllable.
A combination of switched gain and attenuation stages are distributed throughout the receiver. An A/D is used in place of the classic piston attenuator to provide the receiver's unique linearity and accuracy. The unit is configured as a dual conversion receiver. A digitally controlled phase lock loop at the first conversion allows the receiver to deal effectively with less desirable signals, as well as clean, synthesised signals.
Final synchronous detection is handled digitally allowing the receiver to achieve resolution down to 0.001 dB. Variations in signal-to noise ratio are not handled by injection of noise as in previous receivers of this type. This is now handled in the post detection signal processing using a noise algorithm.
Reliability
The VM-7 has undergone extensive testing on production units so that customers will be ensured excellent reliability in service. Special attention has been paid to cooling requirements, significantly extending component life. |
