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The Tektronix 1L20 is a spectrum analyzer plug-in for [[500-series scopes]].
{{Plugin Sidebar
It covers the frequency range from 10MHz to 4.2GHz.
|manufacturer=Tektronix
|series=500-series scopes
|type=1L20
|summary=4.2 GHz Spectrum Analyzer plug-in
|image=Tek 1L20 front2.jpeg
|caption=1L20 front
|introduced=1965
|discontinued=1975
|manuals=
* [[Media:070-0519-00.pdf|Tektronix 1L20 Manual]] (bad-OCR)
<!-- * [https://w140.com/tek_1l20.pdf alternate copy]-->
* [[Media:050-0348-00.pdf|RF Oscillator Tube Substitution Kit (050-0348-00)]]
* [http://ki3u.byethost3.com/Radio-PhysicsDIR/Substitute_uhf_osc_tubes_for_Tek_1L20.html Berj / KI3U's Page on 1L20 Oscillator Repair]
* [[Media:Tek 1L20 mod 139A.pdf|Tektronix 1L20 Mod 139A]]
* [[Media:Tek 1L20 mod 139B.pdf|Tektronix 1L20 Mod 139B Modification Insert]]
}}
The '''Tektronix 1L20''' is a spectrum analyzer plug-in for [[500-series scopes]].
It covers the frequency range from 10 MHz to 4.2 GHz.
 
The 1L20 was originally the third-party [[Pentrix L20|Pentrix L-20]].
The model number was changed some time after Tektronix took over [[Pentrix]] in 1964.
 
{{BeginSpecs}}
{{Spec | Frequency range | 10 MHz to 4 GHz }}
{{Spec | Sensitivity | −110 to −90 dBm }}
{{Spec | Dispersion | 15 kHz to 60 MHz, magnifier usable to 2.5 kHz }}
{{Spec | Resolution bandwidth | 1 kHz to 100 kHz, variable }}
{{Spec | Display | log, lin, square, video }}
{{EndSpecs}}


* [http://w140.com/tek_1l20.pdf Tektronix 1L20 Manual (PDF)]
==Prices==
* [http://ki3u.byethost3.com/Radio-PhysicsDIR/Substitute_uhf_osc_tubes_for_Tek_1L20.html Berj / KI3U's Page on 1L20 Oscillator Repair]
$1,995 in 1965 ($19,400 in 2023 dollars)
 
==Internals==
Originally (in SN 100-519), the UHF oscillator tubes V40 and V41 were type [[Y1506]] (Tek part #[[154-0499-00]]).
As the Y1506's became unavailable, a 1967 revision of the 1L20 changed these to [[Y1641]] (GE 16411?) tubes ([[154-0506-00]]), necessitating a slight modification of their DC filament supply circuit.


==Pictures==
<gallery>
<gallery>
File:Tek 1l20 pb.jpg
Tek 1L20 front2.jpeg
Image:1L20_1.jpg
Tek 1L20 left2.jpeg
File:1L20 block.png|Block Diagram
Tek 1L20 right2.jpeg
File:1L20 rf and phase lock block.png|RF and Phase Lock Block Diagram
Tek 1L20 top2.jpeg
File:1L20 if block.png|IF Block Diagram
Tek 1L20 bottom2.jpeg
File:1L20 schem rf section.png|RF Section
1L20 front.JPG|Front
File:1L20 schem phase lock.png|Phase Lock Circuit
1L20 left.JPG|Left
File:1L20 wideband amp and mixer.png|Wideband Amp and Mixer
1L20 right.JPG|Right
File:1L20 schem sweeper.png|Sweeper
1L20 top.JPG|Top
File:1L20 schem if attenuator.png|IF Attenuator
1L20 bottom.JPG|Bottom
File:1L20 schem if amp 70mhz osc mixer.png|IF Amp, 70MHz Oscillator and Mixer
Tek 1l20 pb.jpg
File:1L20 schem variable resolution.png|Variable Resolution Circuit
1L20_1.jpg
File:1L20 schem output amp.png|Output Amplifier
1L20 block.png|Block Diagram
1L20 rf and phase lock block.png|RF and Phase Lock Block Diagram
1L20 if block.png|IF Block Diagram
1L20 schem rf section.png|RF Section
1L20 schem phase lock.png|Phase Lock Circuit
1L20 wideband amp and mixer.png|Wideband Amp and Mixer
1L20 schem sweeper.png|Sweeper
1L20 schem if attenuator.png|IF Attenuator
1L20 schem if amp 70mhz osc mixer.png | IF Amp, 70 MHz Oscillator and Mixer
1L20 schem variable resolution.png | Variable Resolution Circuit
1L20 schem output amp.png | Output Amplifier
</gallery>
</gallery>
==Components==
{{Parts|1L20}}
[[Category:500 series spectrum analyzer plugins]]

Latest revision as of 12:45, 17 October 2023

Tektronix 1L20
4.2 GHz Spectrum Analyzer plug-in
1L20 front

Compatible with 500-series scopes

Produced from 1965 to 1975

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 1L20 is a spectrum analyzer plug-in for 500-series scopes. It covers the frequency range from 10 MHz to 4.2 GHz.

The 1L20 was originally the third-party Pentrix L-20. The model number was changed some time after Tektronix took over Pentrix in 1964.

Key Specifications

Frequency range 10 MHz to 4 GHz
Sensitivity −110 to −90 dBm
Dispersion 15 kHz to 60 MHz, magnifier usable to 2.5 kHz
Resolution bandwidth 1 kHz to 100 kHz, variable
Display log, lin, square, video

Prices

$1,995 in 1965 ($19,400 in 2023 dollars)

Internals

Originally (in SN 100-519), the UHF oscillator tubes V40 and V41 were type Y1506 (Tek part #154-0499-00). As the Y1506's became unavailable, a 1967 revision of the 1L20 changed these to Y1641 (GE 16411?) tubes (154-0506-00), necessitating a slight modification of their DC filament supply circuit.

Pictures

  • Front

    Front

  • Left

    Left

  • Right

    Right

  • Top

    Top

  • Bottom

    Bottom

  • Block Diagram

    Block Diagram

  • RF and Phase Lock Block Diagram

    RF and Phase Lock Block Diagram

  • IF Block Diagram

    IF Block Diagram

  • RF Section

    RF Section

  • Phase Lock Circuit

    Phase Lock Circuit

  • Wideband Amp and Mixer

    Wideband Amp and Mixer

  • Sweeper

    Sweeper

  • IF Attenuator

    IF Attenuator

  • IF Amp, 70 MHz Oscillator and Mixer

    IF Amp, 70 MHz Oscillator and Mixer

  • Variable Resolution Circuit

    Variable Resolution Circuit

  • Output Amplifier

    Output Amplifier

Components

Some Parts Used in the 1L20

Part Part Number(s) Class Description Used in
12AU6 154-0040-00 Vacuum Tube (Pentode) RF pentode 81 • 112 • 1L10 • 1L20 • 1L60 • 3L10 • 512 • 556 • 575 • 545 • 547 • 549 • 581 • 585 • A • B • C • G • K • H • L • ML • M • N • O • R • S • Z
Y1506 154-0499-00 Vacuum Tube (Triode) SHF cermet triode 1L20
Y1641 154-0506-00 • 154-0510-00 Vacuum Tube (Triode) SHF cermet triode 1L20 • 491
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