1L40: Difference between revisions

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.

* 119-0097-00: 12.4 GHz to 18 GHz

* 119-0099-00: 26.5 GHz to 40 GHz

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 1^st 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.

Tek 1l40 front.jpg             | 1L40 Front

Tek 1l40 cat.jpg               | Front view from catalog

Bent tooth gear and screw.jpg | Bent tooth on 1L40 tuning gear provides limit stop in both directions.

Tek 1l40 mixers.png     |External Mixers and Adaptor

Tek 119-0097-00 1.jpg   | 119-0097-00

Tek 119-0097-00 2.jpg   | 119-0097-00

Tek 119-0098-00 1.jpg   | 119-0098-00

Tek 119-0098-00 2.jpg   | 119-0098-00

Tek 119-0099-00 1.jpg   | 119-0099-00

Tek 119-0099-00 2.jpg   | 119-0099-00

1L40_front.jpg                     | Front view

1L40_threequarter.jpg             | Threequarter view

1L40_right.jpg                     | 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.

1L40_left.jpg                     | Left side view

1L40_rear.jpg                     | Rear view. Note the selector switch to adapt the sweep input voltage to different models in the 500 series range.

1L40_bottom.jpg                   | Bottom view

1L40_top.jpg                       | 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.

1L40_input_closeup.jpg             | Input connector. This is the basic 1.5-12.4 GHz input, which can be removed and replaced with an extension cable to waveguide mixers for higher frequencies.

1L40_dial_closeup.jpg             | Closeup of RF centre frequency dial. Fundamental range is at the bottom with harmonics above.

1L40_dispersion_switch_closeup.jpg | Closeup of part of the dispersion range switch assembly. Note the two little fingers attached to the shaft which operate the toggle switch.

1L40_in_535A_2100MHz.jpg           | 1L40 in 535A mainframe tuned to 2100 MHz cellular band showing signals. 5 MHz/div dispersion.

1L40_2100MHz_closeup.jpg           | Tuned to 2100 MHz cellular band (5 MHz/div dispersion) showing 3 G data downlinks from various operators. From the right: Orange, T-Mobile, Plus and Play. Photo taken in Warsaw, Poland, January 2018.

1L40_IF.jpg                       | Signals displayed straight through the plugin's 150-250 MHz IF. Dispersion 5 MHz/div, centre frequency 200 MHz. The peak on the left is the local DAB radio multiplex on channel 6B, 183.648 MHz. The hump to the right of that is the local DVB-T multiplex 'Mux 8' on channel 7. Photo taken in Warsaw, Poland, January 2018.