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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=4.2 GHz Spectrum Analyzer plug-in | | |series=500-series scopes | ||
image=1L20 | |type=1L20 | ||
caption=1L20 front | | |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] | * [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]]. | 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. | 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 1L20 was originally the third-party [[Pentrix L20|Pentrix L-20]]. | ||
was changed some time after Tektronix took over [[Pentrix]] in 1964. | 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}} | |||
==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== | ==Pictures== | ||
<gallery> | <gallery> | ||
Tek 1L20 front2.jpeg | |||
Tek 1L20 left2.jpeg | |||
Tek 1L20 right2.jpeg | |||
Tek 1L20 top2.jpeg | |||
Tek 1L20 bottom2.jpeg | |||
1L20 front.JPG|Front | |||
1L20 left.JPG|Left | |||
1L20 right.JPG|Right | |||
1L20 top.JPG|Top | |||
1L20 bottom.JPG|Bottom | |||
Tek 1l20 pb.jpg | |||
1L20_1.jpg | |||
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]] |