1L40
Template:Plugin Sidebar 2 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.
The front-end mixer of the 1L40 is a removable module. By default the 1L40 comes with a coaxial mixer, Tek part number 119-0096-00, which works up to 12.4 GHz. The 119-0096-00 contains a 1N415D detector diode.
Type 1L40 was produced for only 3 years, making it the shortest-lived letter-series plug-in.
- 12.4 GHz to 18 GHz requires the 119-0097-00.
- 18 GHz to 26.5 GHz requires the 119-0098-00.
- 26.5 GHz to 40 GHz requires the 119-0099-00.
Specifications
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Pictures
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1L40 Front
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Front View from Catalog
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Bent tooth on 1L40 tuning gear provides limit stop in both directions.
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External Mixers and Adaptor
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119-0097-00
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119-0097-00
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119-0098-00
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119-0098-00
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119-0099-00
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119-0099-00
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Front view
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Threequarter view
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Right side view. Note the housing for the removable input mixer at bottom left, and the tuned cavity for the 1st local oscillator at the top.
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Left side view.
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Rear view. Note the selector switch to adapt the sweep input voltage to different models in the 500 series range.
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Bottom view.
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Top view. Cavity for the 1st local oscillator is on the right, and the tuning mechanism is visible. IF filters and attenuators are in the can in the middle.
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Input connector. This is the basic 1.5-12.4GHz input, which can be removed and replaced with an extension cable to waveguide mixers for higher frequencies.
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Closeup of RF centre frequency dial. Fundamental range is at the bottom with harmonics above.
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Closeup of part of the dispersion range switch assembly. Note the two little fingers attached to the shaft which operate the toggle switch.
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1L40 in 535A mainframe tuned to 2100MHz cellular band showing signals. 5MHz/div dispersion.
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Tuned to 2100MHz cellular band (5MHz/div dispersion) showing 3G data downlinks from various operators. From the right: Orange, T-Mobile, Plus and Play. Photo taken in Warsaw, Poland, January 2018.
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Signals displayed straight through the plugin's 150-250MHz IF. Dispersion 5MHz/div, centre frequency 200MHz. The peak on the left is the local DAB radio multiplex on channel 6B, 183.648MHz. The hump to the right of that looks like a DVB-T multiplex on channel 7, but I can't identify it. Photo taken in Warsaw, Poland, January 2018.
