491: Difference between revisions

1 byte removed ,  5 July 2019
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NOTE: Due to severe performance limitations, it was replaced by the completely redesigned 492 in 1980
NOTE: Due to severe performance limitations, it was replaced by the completely redesigned 492 in 1980


The '''Tektronix 491P''' is a spectrum analyzer with a frequency range of 10 MHz to 40 GHz.  The minimum resolution bandwidth is 1 kHz, and provides measurement resolution proportional to the frequency accuracy or span.   
The '''Tektronix 491''' is a spectrum analyzer with a frequency range of 10 MHz to 40 GHz.  The minimum resolution bandwidth is 1 kHz, and provides measurement resolution proportional to the frequency accuracy or span.   


Front panel inputs/outputs are: RF INPUT (A) [[BNC connector]] (50Ω, 10 MHz to 275 MHz); RF INPUT (B) [[N connector]] (50Ω, 275 MGHz to 2 GHz); WAVEGUIDE (C) [[N connector]] (50Ω; 12.4 GHz to 40 GHz); and a dual function 1 MHz MARKERS OUT [[BNC connector]] (With the INT REF FREQ in the ON position a 1 MHz marker outputs to this connector.  With the INT REF FREQ in the OFF position EXT REF FREQ IN “same” [[BNC connector]] accepts an external signal between 1 MHz and 5 MHz (1 to 5 V peak to peak) applied to the connector becomes the reference frequency for the phase lock operation).
Front panel inputs/outputs are: RF INPUT (A) [[BNC connector]] (50Ω, 10 MHz to 275 MHz); RF INPUT (B) [[N connector]] (50Ω, 275 MGHz to 2 GHz); WAVEGUIDE (C) [[N connector]] (50Ω; 12.4 GHz to 40 GHz); and a dual function 1 MHz MARKERS OUT [[BNC connector]] (With the INT REF FREQ in the ON position a 1 MHz marker outputs to this connector.  With the INT REF FREQ in the OFF position EXT REF FREQ IN “same” [[BNC connector]] accepts an external signal between 1 MHz and 5 MHz (1 to 5 V peak to peak) applied to the connector becomes the reference frequency for the phase lock operation).
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