7L18: Difference between revisions

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{{Plugin Sidebar 2 |
{{Plugin Sidebar 2 |
title=Tektronix 7L18|
title=Tektronix 7L18 |
summary=18 (60) GHz Spectrum Analyzer|
summary=18 (60) GHz Spectrum Analyzer |
image=7L18-front.jpg|
image=7L18-front.jpg |
caption=Tektronix 7L18|
caption=Tektronix 7L18 |
introduced=1978 |
introduced=1977 |
discontinued=1984 |
discontinued=1984 |
series=[[7000-series scopes]]|
series=[[7000-series scopes]] |
manuals=[http://w140.com/tek_7l18_interim_ocr.pdf Tektronix 7L18 Interim Manual (PDF)]
manuals=[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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==Specifications==
==Specifications==
''please add''
''please add''
==Links==
* [http://w140.com/tekscope_scans/Indiv_Issue_Scans/9-3_1977.pdf Tekscope Vol. 9 No. 3, 1977]


==Pictures==
==Pictures==
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Service views:
Service views:
<gallery>
<gallery>
Image:7L18-top.jpg|Top view
File:7L18-top.jpg|Top view
Image:7L18-bottom.jpg|Bottom view
File:7L18-bottom.jpg|Bottom view
Image:7L18-service-rightfront.jpg|Service setup for the right front panel
File:7L18-service-rightfront.jpg|Service setup for the right front panel
</gallery>
</gallery>


Boards within the digital card cage (from back to front):
Boards within the digital card cage (from back to front):
<gallery>
<gallery>
Image:7L18-board-crtreadout.jpg|CRT Readout board
File:7L18-board-crtreadout.jpg|CRT Readout board
Image:7L18-board-centerfreqreadout.jpg|Center Freq Readout board
File:7L18-board-centerfreqreadout.jpg|Center Freq Readout board
Image:7L18-board-sweephoriz.jpg|Sweep Horiz board
File:7L18-board-sweephoriz.jpg|Sweep Horiz board
Image:7L18-board-spanatten.jpg|Span Atten board
File:7L18-board-spanatten.jpg|Span Atten board
Image:7L18-board-phaselock-rear.jpg|Phase Lock module, rear
File:7L18-board-phaselock-rear.jpg|Phase Lock module, rear
Image:7L18-board-phaselock-front.jpg|Phase Lock module, front
File:7L18-board-phaselock-front.jpg|Phase Lock module, front
Image:7L18-board-phaselocklogicctl.jpg|Phase Lock Logic CTL
File:7L18-board-phaselocklogicctl.jpg|Phase Lock Logic CTL
Image:7L18-board-vrnoisefilter.jpg|VR Noise Filter
File:7L18-board-vrnoisefilter.jpg|VR Noise Filter
image:7L18-board-logvideoamp.jpg|Log & Video Amp
image:7L18-board-logvideoamp.jpg|Log & Video Amp
Image:7L18-board-centerfreqdvm.jpg|Center Freq DVM
File:7L18-board-centerfreqdvm.jpg|Center Freq DVM
Image:7L18-board-centerfreqdvm-front.jpg|Digital Storage, front
File:7L18-board-centerfreqdvm-front.jpg|Digital Storage, front
Image:7L18-board-centerfreqdvm-back.jpg|Digital Storage, back
File:7L18-board-centerfreqdvm-back.jpg|Digital Storage, back
Image:7L18-board-microcomputer.jpg|Micro Computer
File:7L18-board-microcomputer.jpg|Micro Computer
</gallery>
</gallery>


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Internal views of the analog parts:
Internal views of the analog parts:
<gallery>
<gallery>
Image:7L18-sampler.jpg|Internal of the LO sampler
File:7L18-sampler.jpg|Internal of the LO sampler
</gallery>
</gallery>


Revision as of 11:14, 3 July 2015

Template:Plugin Sidebar 2 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.

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. Note that it 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 range is 0 dB to 60 dB in 10 dB steps and 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.

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.

Specifications

please add

Links

Pictures

Service views:

  • Top view

    Top view

  • Bottom view

    Bottom view

  • Service setup for the right front panel

    Service setup for the right front panel

Boards within the digital card cage (from back to front):

  • CRT Readout board

    CRT Readout board

  • Center Freq Readout board

    Center Freq Readout board

  • Sweep Horiz board

    Sweep Horiz board

  • Span Atten board

    Span Atten board

  • Phase Lock module, rear

    Phase Lock module, rear

  • Phase Lock module, front

    Phase Lock module, front

  • Phase Lock Logic CTL

    Phase Lock Logic CTL

  • VR Noise Filter

    VR Noise Filter

  • Log & Video Amp

    Log & Video Amp

  • Center Freq DVM

    Center Freq DVM

  • Digital Storage, front

    Digital Storage, front

  • Digital Storage, back

    Digital Storage, back

  • Micro Computer

    Micro Computer

The microcomputer board is built using three very old Intel chips: an Intel 4004 processor, an Intel 4002 320-bit RAM and 4-bit output port, and an Intel D4289 standard memory interface. The D4289 connects the 4004 to the two 2K8 ROMs. Note that in an earlier version of the 7L18 there were 6 ROMs.

Internal views of the analog parts:

  • Internal of the LO sampler

    Internal of the LO sampler

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