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Nelson-Ross PSA-011: Difference between revisions
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The Nelson-Ross PSA-011 is a spectrum analyzer plug-in for [[500-series scopes]]. | 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 | The center frequency range is 10 Hz to 20 kHz. It can display amplitude in | ||
linear or log scale. The voltage-controlled local oscillator is tuned | 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 of the scope plug-in interface connector. | |||
Pin 1 of the scope plug-in interface connector | |||
(the other side of the differential input) | |||
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]]. | using a variable-reactance tube, V6, a [[6201]]. | ||