7L13: Difference between revisions

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{{Plugin Sidebar 2 |
{{Plugin Sidebar 2 |
title=Tektronix 7L13 |
title=Tektronix 7L13 |
summary=1.8 GHz Spectrum Analyzer |
summary=1.8/2.5 GHz Spectrum Analyzer |
image=Tek-7l13-front-crop.jpg |
image=Tek-7l13-front-crop.jpg |
caption=Tektronix 7L13 |
caption=Tektronix 7L13 |
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}}
}}


The '''Tektronix 7L13''' is a 1 kHz to 1.8 GHz Spectrum Analyzer plug-in for [[7000-series scopes]].
The '''Tektronix 7L13''' is a 1 kHz to 1.8 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 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.
It 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.
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{{BeginSpecs}}
{{BeginSpecs}}
{{Spec|Input frequency      | 100 kHz – 1.8 GHz}}
{{Spec|Input frequency      | 100 kHz – 1.8 GHz (modified version up to 2.5 GHz)}}
{{Spec|Span                | 200 Hz/Div – 100 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}}
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1<sup>st</sup> LO (a YIG oscillator) is fixed (stabilized by a PLL) and the 2<sup>nd</sup> LO is swept.
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).  
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.
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.
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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.
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]].
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==
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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 POCSAG FSK signal at 162 MHz (variable persistence storage on a [[7623]])
Tek 7l13 trace.jpg
Tek 7l13 trace.jpg
</gallery>
</gallery>

Revision as of 06:15, 21 February 2021

Template:Plugin Sidebar 2

The Tektronix 7L13 is a 1 kHz to 1.8 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 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 CRT readout as well as on a LED display.

The TR502 tracking generator is designed to work with the 7L13 up to 1.8 GHz.

Key Specifications

Input frequency 100 kHz – 1.8 GHz (modified version up to 2.5 GHz)
Span 200 Hz/Div – 100 MHz/Div
Sweep 1 μs/Div to 10 s/Div (1−2−5), manual, external
Resolution bandwidth 30 Hz – 3 MHz in decade steps
Sensitivity −128 dBm at 300 Hz to −80 dBm at 3 MHz
Vertical scale 10 dB/Div, 2 dB/Div or linear
Reference level −110 dBm – +30 dBm in 10 dB steps
Video filters 30 kHz, 300 Hz or 10 Hz
Features
  • Automatic phase lock
  • CRT readout of center frequency
  • UNCAL indicator
  • built-in calibrator 50 MHz, −30 dBm
  • Base line clipper

Links

Prices

Year 1974 1976 1980
Catalog price $6,500 $7,500 $10,500
2020 Dollars $34,100 $34,100 $33,000

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 1st mixer, with a 1st LO frequency between 2.095 GHz and 3.895 GHz. At spans of 50 kHz/Div and below, the 1st LO (a YIG oscillator) is fixed (stabilized by a PLL) and the 2nd LO is swept.

The 1st IF filter is 10 MHz wide, centered at 2.095 GHz. With a 2nd 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 (3rd LO at 95 MHz).

At the 10 MHz 3rd 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 quad opamp, 155-0042-02 Miller integrator, 155-0056-00 sweep control, 155-0088-00 legend generator.

Pictures

Display examples