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{{Plugin Sidebar 2 |
{{Plugin Sidebar
title=Tektronix 7L13 |
|manufacturer=Tektronix
summary=2.5 GHz Spectrum Analyzer |
|series=7000-series scopes
image=Tek-7l13-front-crop.jpg |
|type=7L13  
caption=Tektronix 7L13 |
|summary=1.8/2.5 GHz Spectrum Analyzer  
introduced=1974 |
|image=Tek-7l13-front-crop.jpg  
discontinued=1981 |
|caption=Tektronix 7L13  
series=[[7000-series scopes]] |
|introduced=1974  
manuals=
|discontinued=1981  
* [http://bama.edebris.com/download/tek/7l13/7l13.pdf Tektronix 7L13 Manual (31MB, PDF)]
|designers=Fred Telewski
* [http://w140.com/smb/7l13_sm.pdf Tektronix 7L13 Manual (29MB, OCR, PDF)]
|manuals=
* [[Media:070-1673-00.pdf|7L13 Instruction Manual]] (OCR)
* [[Media:Tek 7L13 factory cal.pdf|Tektronix 7L13 Factory Calibration Procedure]]
* [[Media:26AX-3582-3.pdf|FM Broadcast Measurements Using the Spectrum Analyzer]]
}}
}}
The '''Tektronix 7L13''' is a 1 kHz to 1.8 GHz Spectrum Analyzer plug-in for [[7000-series scopes]], designed by [[Fred Telewski]] who also led the [[TR502]] development.


The '''Tektronix 7L13''' is a 1 kHz to 2.5 GHz Spectrum Analyzer plug-in for [[7000-series scopes]].
From 1977 on, a modified version with coverage up to 2.5 GHz was available upon request (no official option listed in the catalog).
It is similar to the [[7L12]] but extends coverage from 1.8 to 2.5 GHz and adds a marker function.
 
The 7L13 is similar to the [[7L12]] but occupies three module bays, adds a marker function, offers resolution bandwidth down to 30 Hz, and improves sensitivity by 10 dB.  It also displays the center frequency in the [[7000 series readout system|CRT readout]] as well as on a LED display.
 
When used in a four-compartment 7000 series mainframe, it must occupy the two vertical slots and the left horizontal slot.


The [[TR502]] tracking generator is designed to work with the 7L13 up to 1.8 GHz.
The [[TR502]] tracking generator is designed to work with the 7L13 up to 1.8 GHz.
After 1982, the 7L13 was superseded by the similar [[7L14]] which added digital storage.


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec|Input frequency      | 100 kHz – 2.5 GHz}}
{{Spec|Input frequency      | 100 kHz – 1.8 GHz (modified version up to 2.5 GHz)}}
{{Spec|Span                | ? Hz/Div – ? MHz/Div}}
{{Spec|Span                | 200 Hz/Div – 100 MHz/Div}}
{{Spec|Sweep                | 1 μs/Div to 10 s/Div (1-2-5), manual, external}}
{{Spec|Sweep                | 1 μs/Div to 10 s/Div (1−2−5), manual, external}}
{{Spec|Resolution bandwidth | 30 Hz – 3 MHz in decade steps}}
{{Spec|Resolution bandwidth | 30 Hz – 3 MHz in decade steps}}
{{Spec|Sensitivity          | ? dBm at 300 Hz}}
{{Spec|Sensitivity          | −128 dBm at 300 Hz to −80 dBm at 3 MHz }}
{{Spec|Vertical scale      | 10 dB/Div, 2 dB/Div or linear}}
{{Spec|Vertical scale      | 10 dB/Div, 2 dB/Div or linear}}
{{Spec|Reference level      | ? dB<sub>m</sub> – ? dB<sub>m</sub> }}
{{Spec|Reference level      | −110 dB<sub>m</sub> – +30 dB<sub>m</sub> in 10 dB steps }}
{{Spec|Video filters        | 30 kHz, 300 Hz or 10 Hz}}
{{Spec|Video filters        | 30 kHz, 300 Hz or 10 Hz}}
{{Spec|Features            |
{{Spec|Features            |
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* CRT readout of center frequency
* CRT readout of center frequency
* UNCAL indicator  
* UNCAL indicator  
* built-in calibrator 50 MHz, -30 dBm
* built-in calibrator 50 MHz, −30 dBm
* Base line clipper
* Base line clipper
}}
}}
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==Links==
==Links==
* [https://www.radiomuseum.org/r/tektronix_spectrum_analyzer_7l13.html Tektronix 7L13 @ radiomuseum.org]
* [http://www.barrytech.com/tektronix/tek7000/tek7l13.html Tektronix 7L13 @ barrytech.com]
* [http://www.barrytech.com/tektronix/tek7000/tek7l13.html Tektronix 7L13 @ barrytech.com]
* [http://www.radiomuseum.org/r/tektronix_spectrum_analyzer_7l13.html Tektronix 7L13 @ radiomuseum.org]
{{Documents|Link=7L13}}
 
==Prices==
 
{| class="wikitable"
|-
! Year
! 1974
! 1976
! 1980
|-
! Catalog price
| align="right" |  $6,500
| align="right" |  $7,500
| align="right" | $10,500
|-
! In 2023 Dollars
| align="right" | $40,100
| align="right" | $40,100
| align="right" | $38,800
|-
|}
In [[Media:TekWeek (partial) October 10, 1975.pdf|TekWeek 10 Oct 1975]], [[Thor Hallen]] says
<blockquote>
The 7L13 is a 3-wide plug-in and is the most expensive plug-in we make. The price is $7,500.
</blockquote>
 
According to an [[Media:Tek Schottky Diodes Memo rot.pdf|internal memo]], in 1979 annual sales were estimated at 537 units.
 
==Internals==
 
The input signal passes a 0 to 60 dB step attenuator, a 1.8 GHz low-pass filter, and a 3 dB isolation pad before the 1<sup>st</sup> mixer, with a 1<sup>st</sup> LO frequency between 2.095 GHz and 3.895 GHz. At spans of 50 kHz/Div and below, the
1<sup>st</sup> LO (a YIG oscillator) is fixed (stabilized by a PLL) and the 2<sup>nd</sup> LO is swept.
 
The 1<sup>st</sup> IF filter is 10 MHz wide, centered at 2.095 GHz.  With a 2<sup>nd</sup> LO at 2.2 GHz, the signal is mixed to a 105 MHz IF, amplified, filtered again (105±1.5 MHz) and mixed down to 10 MHz (3<sup>rd</sup> LO at 95 MHz).
 
At the 10 MHz 3<sup>rd</sup> IF, resolution filters (300 kHz L/C, 30 kHz, 3 kHz or 300 Hz crystal filters) can be selected.  The detector (discrete log amplifier) and video filters follow.
The digital frequency readout is a DVM ([[Fairchild 3814]]) working off the the YIG oscillator control voltage, not a frequency counter, which is why it needs to be calibrated before use.
 
Custom integrated circuits used: [[155-0035-00|155-0035-00 quad opamp]], [[155-0042-02|155-0042-02 Miller integrator]], [[155-0056-00|155-0056-00 sweep control]], [[155-0088-00|155-0088-00 legend generator]].


==Pictures==
==Pictures==
<gallery>
<gallery>
Image:Tek 7l13 1.jpg
Tek 7l13 1.jpg
Image:Tek 7l13 2.jpg
Tek 7l13 2.jpg
Image:Tek 7l13 3.jpg
Tek 7l13 3.jpg
Image:Tek 7l13 4.jpg
Tek 7l13 4.jpg
Image:Tek 7l13 5.jpg
Tek 7l13 5.jpg
File:Two 7L13s.jpg
Two 7L13s.jpg
Tek 7l13 rear.jpg
Tek 7l13 rear.jpg
Tek 7L13 B110xxx front.jpg
Tek 7L13 B110xxx bottom.jpg
Tek 7L13 B110xxx ref level display mechanics.jpg
Tek 7L13 B110xxx right.jpg
Tek 7L13 B110xxx top.jpg
</gallery>
===Display examples===
<gallery>
Tek 7L13 display example.jpg  | 7L13 displaying a [[wikipedia:Radio-paging code No. 1|POCSAG]] FSK signal at 162 MHz (variable persistence storage on a [[7623]])
Tek 7l13 trace.jpg
Tek 7l13 trace.jpg
</gallery>
</gallery>
==Components==
{{Parts|7L13}}




[[Category:7000 series combined plugins]]
[[Category:7000 series combined plugins]]
[[Category:Spectrum Analyzers]]
[[Category:7000 series spectrum analyzer plugins]]
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