1L40: Difference between revisions

Latest revision as of 00:50, 22 September 2023

Tektronix 1L40
40 GHz Spectrum Analyzer plug-in 1L40 front Compatible with 500-series scopes Produced from 1969 to 1972 Manuals Tektronix 1L40 Manual (bad-OCR) Tektronix 1L40 Factory Calibration Procedure, March 1969 (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:

119-0097-00: 12.4 GHz to 18 GHz
119-0098-00: 18 GHz to 26.5 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.

Key Specifications

please add

Pictures

1L40 Front
Front view from catalog
Bent tooth on 1L40 tuning gear provides limit stop in both directions.
External Mixers and Adaptor
119-0097-00
119-0097-00
119-0098-00
119-0098-00
119-0099-00
119-0099-00
Front view
Threequarter view
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.
Left side view
Rear view. Note the selector switch to adapt the sweep input voltage to different models in the 500 series range.
Bottom view
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.
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.
Closeup of RF centre frequency dial. Fundamental range is at the bottom with harmonics above.
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 mainframe tuned to 2100 MHz cellular band showing signals. 5 MHz/div dispersion.
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.
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.

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

@@ Line 1: / Line 1: @@
-{{Plugin Sidebar 2 |
+{{Plugin Sidebar
-title=Tektronix 1L40 |
+|manufacturer=Tektronix
-summary=40 GHz Spectrum Analyzer plug-in |
+|series=500-series scopes
-image=Tek 1l40 cat.jpg |
+|type=1L40
-caption=1L40 front (catalog image) |
+|summary=40 GHz Spectrum Analyzer plug-in
-series=[[500-series scopes]] |
+|image=Tek 1l40 front2.jpeg
-introduced=1969 |
+|caption=1L40 front
-discontinued=(?) |
+|introduced=1969
-manuals=
+|discontinued=1972
+|manuals=
-* [http://w140.com/tek_1l40.pdf Tektronix 1L40 Manual (PDF)]
+* [[Media:070-0904-00.pdf|Tektronix 1L40 Manual]] (bad-OCR)
+<!-- [http://w140.com/tek_1l40.pdf Tektronix 1L40 Manual]] (bad scan)-->
+* [[Media:Tek 1l40 fcp march 1969.pdf|Tektronix 1L40 Factory Calibration Procedure, March 1969]]
 }}
 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.
+It covers the frequency range from 1.5 GHz to 40 GHz using four different removable front-end mixer modules.
-The front-end mixer of the 1L40 is a removable module.  By default the 1L40 comes with
+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.
-a coaxial mixer, Tek part number 119-0096-00, which works up to 12.4 GHz.
-* 12.4 GHz to 18 GHz requires the 119-0097-00.
+Higher frequencies are covered by three waveguide mixers:
-* 18 GHz to 26.5 GHz requires the 119-0098-00.
+* [[119-0097-00]]: 12.4 GHz to 18 GHz
-* 26.5 GHz to 40 GHz requires the 119-0099-00.
+* [[119-0098-00]]: 18 GHz to 26.5 GHz
+* [[119-0099-00]]: 26.5 GHz to 40 GHz
-==Specifications==
+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.
-[[Category:Specifications needed]]''please add''
+This is because the 1<sup>st</sup> 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.
+{{MissingSpecs}}
 ==Pictures==
 <gallery>
-File:Tek 1l40 front.jpg|1L40 Front
+Tek 1l40 bottom2.jpeg ‎
-File:Bent tooth gear and screw.jpg|Bent tooth on 1L40 tuning gear provides limit stop in both directions.
+Tek 1l40 front2.jpeg ‎
-File:Tek 1l40 cat.jpg|Front View from Catalog
+Tek 1l40 left2.jpeg ‎
-File:Tek 1l40 mixers.png|External Mixers and Adaptor
+Tek 1l40 rear2.jpeg ‎
-File:Tek 119-0097-00 1.jpg|119-0097-00
+Tek 1l40 right2.jpeg ‎
-File:Tek 119-0097-00 2.jpg|119-0097-00
+Tek 1l40 top2.jpeg
-File:Tek 119-0098-00 1.jpg|119-0098-00
+Tek 1l40 front.jpg             | 1L40 Front
-File:Tek 119-0098-00 2.jpg|119-0098-00
+Tek 1l40 cat.jpg               | Front view from catalog
-File:Tek 119-0099-00 1.jpg|119-0099-00
+Bent tooth gear and screw.jpg  | Bent tooth on 1L40 tuning gear provides limit stop in both directions.
-File:Tek 119-0099-00 2.jpg|119-0099-00
+Tek 1L40 1.jpg
+Tek 1L40 2.jpg
+Tek 1L40 3.jpg
+Tek 1L40 4.jpg
+Tek 1L40 5.jpg
+Tek 1L40 6.jpg
+Tek 1L40 7.jpg
+Tek 1L40 8.jpg
+Tek 1L40 9.jpg
+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
+L40_front.jpg                     | Front view
+L40_threequarter.jpg              | Threequarter view
+L40_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.
+L40_left.jpg                      | Left side view
+L40_rear.jpg                      | Rear view. Note the selector switch to adapt the sweep input voltage to different models in the 500 series range.
+L40_bottom.jpg                    | Bottom view
+L40_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.
+L40_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.
+L40_dial_closeup.jpg              | Closeup of RF centre frequency dial. Fundamental range is at the bottom with harmonics above.
+L40_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.
+L40_in_535A_2100MHz.jpg           | 1L40 in 535A mainframe tuned to 2100 MHz cellular band showing signals. 5 MHz/div dispersion.
+L40_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.
+L40_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.
 </gallery>
@@ Line 41: / Line 78: @@
 [https://drive.google.com/open?id=0B-Q3jyZPb-C1VUx2TUlObmpJdHc&authuser=0 Video of Tuning Limit Stop Mechanism]
-[[Category:Spectrum Analyzers]]
+==Components==
-[[Category:500 series plugins]]
+{{Parts|1L40}}
+[[Category:500 series spectrum analyzer plugins]]