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{{Plugin Sidebar | {{Plugin Sidebar | ||
|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 | ||
|introduced=1974 | |||
|discontinued=1981 | |||
* [ | |designers=Fred Telewski | ||
* [ | |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. | |||
From 1977 on, a modified version with coverage up to 2.5 GHz was available upon request (no official option listed in the catalog). | |||
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After 1982, the 7L13 was superseded by the similar [[7L14]] which added digital storage.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. | {{Spec|Input frequency | 100 kHz – 1.8 GHz (modified version up to 2.5 GHz)}} | ||
{{Spec|Span | | {{Spec|Span | 200 Hz/Div – 100 MHz/Div}} | ||
{{Spec|Sweep | 1 μs/Div to 10 s/Div ( | {{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 | | {{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 | | {{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, | * 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] | ||
{{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> | ||
Tek 7l13 1.jpg | |||
Tek 7l13 2.jpg | |||
Tek 7l13 3.jpg | |||
Tek 7l13 4.jpg | |||
Tek 7l13 5.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: | [[Category:7000 series spectrum analyzer plugins]] |