1L40

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Tektronix 1L40
40 GHz Spectrum Analyzer plug-in
1L40 front

Compatible with 500-series scopes

Produced from 1969 to 1972

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 1L40 is a spectrum analyzer plug-in for 500-series scopes. It covers the frequency range from 1.5 GHz to 40 GHz using four different removable front-end mixer modules.

By default the 1L40 comes with a coaxial mixer, Tek part number 119-0096-00, which works up to 12.4 GHz using a 1N415D detector diode.

Higher frequencies are covered by three waveguide mixers:

Note that the 1L40's display of RF signals is actually back-to-front — lower frequencies are displayed to the right, higher frequencies to the left. This is because the 1st LO is above the input signal frequency, yet the display shows the IF sweep from low to high left-to-right, so the displayed spectrum is inverted.

The 1L40 is also capable of displaying signals in its IF range of 150-250 MHz, because its input is unfiltered so everything passes straight through to the second mixer. In this case, however, the display is left-to-right.

Type 1L40 was produced for only 3 years, making it the shortest-lived letter-series plug-in.

Key Specifications

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Pictures

Video

Video of Tuning Limit Stop Mechanism

Components

Some Parts Used in the 1L40

Part Part Number(s) Class Description Used in
1N3717 152-0381-00 152-0125-00 Discrete component 4.7 mA, 25 pF tunnel diode 1L40 1S1 1S2 11B1 11B2 11B2A 147A 1470 148 21A 22A 3B4 3B5 408 432 434 453 453A 454 466 491 5T3 544 RM544 546 RM546 547 RM547 556 RM556 7B70 7B71 7D11
STD704 152-0125-00 Discrete component 4.7 mA tunnel diode 1L40 1S1 11B1 11B2 11B2A 147 R147 147A R147A 1470 148 R148 148-M 149 R149 149A R149A 21A 22A 3B4 3B5 408 432 434 453 453A 454 464 465 466 491 5T3 544 RM544 546 RM546 547 RM547 556 RM556 7B70 7B71 7D11