Nelson-Ross PSA-011: Difference between revisions
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germanium diode. | germanium diode. | ||
The detected voltage from the diode directly drives | The detected voltage from the diode directly drives | ||
pin 3 of the scope plug-in interface connector. | pin 3 (vertical -) of the scope plug-in interface connector. | ||
Pin 1 of the scope plug-in interface connector | Pin 1 (vertical +) of the scope plug-in interface connector | ||
is fed a DC vertical position voltage by the PSA-011. | is fed a DC vertical position voltage by the PSA-011. | ||
Revision as of 08:51, 29 December 2012
The Nelson-Ross PSA-011 is a spectrum analyzer plug-in for 500-series scopes. The center frequency range is 10 Hz to 20 kHz. It can display amplitude in linear or log scale.
The input is high-impedance and is AC-coupled. The PSA-011 is a single-conversion architecture with a pair of 6BH6 tubes serving as a balanced mixer. After IF filtering and amplification, the signal is detected using a 1N34A germanium diode. The detected voltage from the diode directly drives pin 3 (vertical -) of the scope plug-in interface connector. Pin 1 (vertical +) of the scope plug-in interface connector is fed a DC vertical position voltage by the PSA-011.
The voltage-controlled local oscillator is tuned using a variable-reactance tube, V6, a 6201.
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front
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front 2
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front right
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front left
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bottom
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bottom 2
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left
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rear right
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rear
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rear 2
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rear 3
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schematic
