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[[Image:Tek1401a-front.jpg|thumb|400px|right|Tektronix 1401A Spectrum Analyzer Module]] | [[Image:Tek1401a-front.jpg|thumb|400px|right|Tektronix 1401A Spectrum Analyzer Module]] | ||
The '''Tektronix | The '''Tektronix 1401''' is a spectrum analyzer front-end covering the frequency range | ||
of 1 MHz to 500 MHz, designed to be used with an external oscilloscope, typically a [[323]], | of 1 MHz to 500 MHz, designed to be used with an external oscilloscope, typically a [[323]], | ||
[[324]] or [[326]]. It has internal rechargable NiCd batteries and can also operate | [[324]] or [[326]]. It has internal rechargable NiCd batteries and can also operate | ||
from AC power (using an unusual power cord) or external DC from 6 V to 16 V. | from AC power (using an unusual power cord) or external DC from 6 V to 16 V. | ||
The 1401 is designed to be used with an oscilloscope with 10 horizontal | |||
divisions and 6 vertical divisions. Tektronix says it is compatible with any | divisions and 6 vertical divisions. Tektronix says it is compatible with any | ||
oscilloscope having 0.5 V/div horizontal deflection factor and 1.2 V full screen | oscilloscope having 0.5 V/div horizontal deflection factor and 1.2 V full screen | ||
| Line 19: | Line 13: | ||
initial setup and reading the scale in dBm. Also note the lack of a Z-axis | initial setup and reading the scale in dBm. Also note the lack of a Z-axis | ||
output. | output. | ||
There appear to be two variants of the 1401A, both the manual and | |||
catalog specify the resolution bandwidth selector as 1000, 100 and 3 kHz, | |||
but the later versions are 1000, 100, and 10 kHz. There is also a 1401A-1 | |||
which has a 75 Ω input impedance. The predecessor 1401 did not have | |||
the BNC "cal output" or "cal on" pushbutton switch. | |||
==Internals== | ==Internals== | ||
Operation is typical of a swept front end analyzer. The input is attenuated and | Operation is typical of a swept front end analyzer. The input is attenuated and | ||
low-pass filtered to 500 MHz. It is then mixed with the first LO, a varactor | low-pass filtered to 500 MHz. It is then mixed with the first LO, a varactor | ||