7L18: Difference between revisions

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[[List of manuals that are needed|Manual needed]] (with schematics).
[[List of manuals that are needed|Manual needed]] (with schematics).


Boards within the digital card cage:
Service views:
<gallery>
Image:7L18-top.jpg|Top view
Image:7L18-bottom.jpg|Bottom view
Image:7L18-service-rightfront.jpg|Service setup for the right front panel
</gallery>
 
 
Boards within the digital card cage (from back to front):
<gallery>
<gallery>
Image:7L18-board-crtreadout.jpg|CRT Readout board
Image:7L18-board-crtreadout.jpg|CRT Readout board
Line 27: Line 35:
Image:7L18-board-sweephoriz.jpg|Sweep Horiz board
Image:7L18-board-sweephoriz.jpg|Sweep Horiz board
Image:7L18-board-spanatten.jpg|Span Atten board
Image:7L18-board-spanatten.jpg|Span Atten board
Image:7L18-board-phaselock-rear.jpg|Phase Lock module, rear
Image:7L18-board-phaselock-front.jpg|Phase Lock module, front
Image:7L18-board-phaselocklogicctl.jpg|Phase Lock Logic CTL
Image:7L18-board-vrnoisefilter.jpg|VR Noise Filter
image:7L18-board-logvideoamp.jpg|Log & Video Amp
Image:7L18-board-centerfreqdvm-front.jpg|Center Freq DVM, front
Image:7L18-board-centerfreqdvm-back.jpg|Center Freq DVM, back
</gallery>
</gallery>


 
Internal views of the analog parts:
<gallery>
<gallery>
Image:7L18-sampler.jpg|Internal of the LO sampler
Image:7L18-sampler.jpg|Internal of the LO sampler
Image:7L18-top.jpg|Top view
Image:7L18-bottom.jpg|Bottom view
Image:7L18-service-rightfront.jpg|Service setup for the right front panel
</gallery>
</gallery>

Revision as of 17:42, 10 May 2013

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 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 to 18 in one span, it will only max span the range selected by the BAND/HARMONIC control. This range is determined by the hetrodyne 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 Wenschel 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. It's 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.

Manual needed (with schematics).

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, front

    Center Freq DVM, front

  • Center Freq DVM, back

    Center Freq DVM, back

Internal views of the analog parts:

  • Internal of the LO sampler

    Internal of the LO sampler

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