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7L13: Difference between revisions
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{{Plugin Sidebar 2 | | {{Plugin Sidebar 2 | | ||
title=Tektronix 7L13 | | title=Tektronix 7L13 | | ||
summary=1. | 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 | 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> | ||