7L18: Difference between revisions

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[[Image:7L18-front.jpg|600px|center]]
{{Plugin Sidebar|
The Tektronix 7L18 is a spectrum analyzer plug-in [[introduced in 1978]] for [[7000-series scopes]].
title=Tektronix 7L19|
It occupies three plug-in bays in the oscilloscope.
summary=18 (60) GHz Spectrum Analyzer|
It covers the range from 1.5 GHz to 18 GHz with the internal mixer and 12.5 GHz to 60 GHz
image=7L18-front.jpg|
caption=Tektronix 7L18|
years=?|
type=combined horizontal/vertical plugin|
series=[[7000-series scopes]]|
manuals=
[[List of manuals that are needed|Manual needed]] (with schematics).
[[Category:Manual needed]]
}}
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.
using external mixers.
Note that it will NOT do 1.5 to 18 in one span, it will only max span
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.
the range selected by the BAND/HARMONIC control.
This range is determined by the hetrodyne harmonic number and sign (sideband) and
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 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
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.
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.
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.
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
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.
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
The output of the sampler goes to the LO input on the mixer.  The mixer IF output
is 510 MHz.
is 510 MHz.


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


Service views:
Service views:
Line 27: Line 38:
Image:7L18-service-rightfront.jpg|Service setup for the right front panel
Image: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):
Line 46: Line 56:
</gallery>
</gallery>


The Micro Computer board has three very old Intel chips:  an Intel 4004 processor,
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
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 2Kx8 ROMs.  Note that in an earlier
interface.  The D4289 connects the 4004 to the two 2K8 ROMs.  Note that in an earlier
version of the 7L18 there were 6 ROMs.
version of the 7L18 there were 6 ROMs.


Revision as of 08:47, 4 June 2014

{{{manufacturer}}} combined horizontal/vertical plugin
18 (60) GHz Spectrum Analyzer
Tektronix 7L18

Compatible with [[7000-series scopes]]

Produced from {{{introduced}}} to {{{discontinued}}}

Manuals

Manual needed (with schematics).

(All manuals in PDF format unless noted otherwise)
[[Category:Introduced in {{{introduced}}}]]
Manuals – Specifications – Links – Pictures

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.

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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