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7L18 (view source)

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{{Plugin Sidebar |
{{Plugin Sidebar  
manufacturer=Tektronix | type=7L18 |
|manufacturer=Tektronix  
summary=18 (60) GHz Spectrum Analyzer |
|series=7000-series scopes
image=7L18-front.jpg |
|type=7L18  
caption=Tektronix 7L18 |
|summary=18 (60) GHz Spectrum Analyzer  
introduced=1977 |
|image=7L18-front.jpg  
discontinued=1984 |
|caption=Tektronix 7L18  
series=[[7000-series scopes]] |
|introduced=1978
manuals=
|discontinued=1984  
* [http://w140.com/tek_7l18_interim_ocr.pdf Tektronix 7L18 Interim Manual (PDF)]
|designers=Linley Gumm;
* [http://w140.com/tek_7l18_operators_ocr.pdf Tektronix 7L18 Operators Manual (PDF)]
|manuals=
* [[Media:070-2339-02.pdf|7L18 Operators Manual]] (OCR)
* [[Media:061-1469-02.pdf|7L18 Interim Service Manual]] (OCR)
* [[Media:Tek tracking the wild preselector 7L18.pdf|Tracking the Wild Preselector in Its Native Habitat - The 7L18]]
* [[Media:Tek tracking the wild preselector 7L18.pdf|Tracking the Wild Preselector in Its Native Habitat - The 7L18]]
* [[Media:Tek 7L18 Opt1.pdf|Digital Interfacing for the 7L18]]
}}
}}
The '''Tektronix 7L18''' is a spectrum analyzer plug-in [[introduced in 1978]] for [[7000-series scopes]].
The '''Tektronix 7L18''' is a spectrum analyzer plug-in [[introduced in 1978]] for [[7000-series scopes]].
It occupies three plug-in bays in the oscilloscope.
It occupies three plug-in bays in the oscilloscope.


The 7L18 covers the range from 1.5 GHz to 18 GHz with the internal mixer and 12.5 GHz to 60 GHz
{{BeginSpecs}}
using external mixers.
{{Spec | Frequency range     | 1.5 GHz to 18 GHz with the internal mixer, 12.5 GHz to 60 GHz using external mixers }}
Note that it will NOT do 1.5 GHz to 18 GHz in one span, it will only max span
{{Spec | Frequency span      | 0; 200 Hz/Div to 500 MHz/Div in 1−2−5 steps; Max (see note below) }}
the range selected by the BAND/HARMONIC control.
{{Spec | Resolution bandwidth | 30 Hz to 3 MHz in decade steps}}
This range is determined by the heterodyne harmonic number and sign (sideband) and
{{Spec | Vertical scale      | 10 dB/Div, 2 dB/Div, or linear }}
the range of the first LO, which is 2 GHz to 4 GHz.
{{Spec | Input attenuator    |  0 dB to 60 dB in 10 dB steps }}
{{Spec | Sweep                | 1 μs/Div to 20 s/Div, auto, ext, or manual }}
{{Spec | Digital functions    | two memory banks (A, B); Display A, B - A saved, peak hold }}
{{EndSpecs}}
''Please expand '' [[Category:Specifications needed]]


The input attenuator range is 0 dB to 60 dB in 10 dB steps and is a standard Weinschel Engineering
==Context==
product driven by a belt.  The range is encoded for the digital dBm reference level display.
[[Linley Gumm]] says:
The signal then passes through a YIG preselector filter with a 50 MHz bandwidth.
<blockquote>Another disappointment was the 7L18 microwave analyzer project, one of the earliest Tek products to have a microprocessor in it.
After the YIG filter, the signal enters the RF input of the mixer assembly.


The LO is a YIG tuned oscillator covering the 2 GHz to 4 GHz range. Its output passes
"We started work on developing this product in 1974, and finally shipped our first instrument in 1978.  
through a sampler assembly used to PLL the YIG on small resolution bandwidths.
As I look back, it was a terribly crude microprocessor, and we made every error in the book.  
The output of the sampler goes to the LO input on the mixer.  The mixer IF output
Of course, we didn't have any of the tools that are available today."
is 510 MHz.


==Specifications==
Although the 7L18 never did sell well, Linley and his crew developed components and technologies that later were used in the [[492]].
''please add''
([[Media:LinleyGumm_TW_03271987.pdf|TekWeek March 27, 1987]])
</blockquote>


==Internals==
==Internals==
The LO is a YIG tuned oscillator covering the 2 GHz to 4 GHz range. 
Its output passes through a sampler assembly used to PLL the YIG on small resolution bandwidths.
The output of the sampler goes to the LO input on the mixer.  The mixer IF output is 510 MHz.
The 7L18's components are controlled by an [[Intel 4004]] 4-bit microprocessor.
The 7L18's components are controlled by an [[Intel 4004]] 4-bit microprocessor.
The 7L18 will NOT do 1.5 GHz to 18 GHz in one span, it will only max span the range selected by the BAND/HARMONIC control. This range is determined by the heterodyne harmonic number and sign (sideband) and the range of the first LO, which is 2 GHz to 4 GHz.
The input attenuator is a standard Weinschel Engineering product driven by a belt. 
The range is encoded for the digital dBm reference level display.
The signal then passes through a YIG preselector filter with a 50 MHz bandwidth.
After the YIG filter, the signal enters the RF input of the mixer assembly.


==Links==
==Links==
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7L18-sampler.jpg|Internal of the LO sampler
7L18-sampler.jpg|Internal of the LO sampler
</gallery>
</gallery>
{{Custom ICs|7L18}}




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[[Category:Spectrum analyzers]]
[[Category:Spectrum analyzers]]
[[Category:Specifications needed]]
[[Category:Specifications needed]]
[[Category:Introduced in 1978]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/61913...81308"

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