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7L18: Difference between revisions
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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= | |image=7L18-front.jpg | ||
discontinued=1984 | | |caption=Tektronix 7L18 | ||
|introduced=1978 | |||
manuals= | |discontinued=1984 | ||
|designers=Linley Gumm; | |||
|manuals= | |||
* [http://w140.com/tek_7l18_interim_ocr.pdf Tektronix 7L18 Interim Manual (PDF)] | * [http://w140.com/tek_7l18_interim_ocr.pdf Tektronix 7L18 Interim Manual (PDF)] | ||
* [http://w140.com/tek_7l18_operators_ocr.pdf Tektronix 7L18 Operators Manual (PDF)] | * [http://w140.com/tek_7l18_operators_ocr.pdf Tektronix 7L18 Operators Manual (PDF)] | ||
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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. | ||
{{MissingSpecs}} | |||
The 7L18 covers the range from 1.5 GHz to 18 GHz with the internal mixer and 12.5 GHz to 60 GHz using external mixers. | The 7L18 covers the range from 1.5 GHz to 18 GHz with the internal mixer and 12.5 GHz to 60 GHz using external mixers. | ||
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After the YIG filter, the signal enters the RF input of the mixer assembly. | After the YIG filter, the signal enters the RF input of the mixer assembly. | ||
==Context== | |||
[[Linley Gumm]] says: | |||
<blockquote>Another disappointment was the 7L18 microwave analyzer project, one of the earliest Tek products to have a microprocessor in it. | |||
"We started work on developing this product in 1974, and finally shipped our first instrument in 1978. | |||
As I look back, it was a terribly crude microprocessor, and we made every error in the book. | |||
Of course, we didn't have any of the tools that are available today." | |||
Although the 7L18 never did sell well, Linley and his crew developed components and technologies that later were used in the [[492]]. | |||
([[Media:LinleyGumm_TW_03271987.pdf|TekWeek March 27, 1987]]) | |||
</blockquote> | |||
==Internals== | |||
The LO is a YIG tuned oscillator covering the 2 GHz to 4 GHz range. | 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. | 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 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. | ||
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[[Category:Spectrum analyzers]] | [[Category:Spectrum analyzers]] | ||
[[Category:Specifications needed]] | [[Category:Specifications needed]] | ||