1L20
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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 is the successor of the originally third-party Pentrix L-20.
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 |
Links
Documents referencing 1L20
| Document | Class | Title | Authors | Year | Links |
|---|---|---|---|---|---|
| Tek interpreting spectrum analyzer displays.pdf | Article | Interpreting Spectrum Analyzer Displays | Morris Engelson | 1966 | Spectrum Analyzers • 1L10 • 1L20 • 1L30 |
| Service Scope 41 Dec 1966.pdf | Article | Interpreting Spectrum Analyzer Displays | Morris Engelson | 1966 | Spectrum Analyzers • 1L10 • 1L20 • 1L30 |
| Service Scope 48 Feb 1968.pdf | Article | Spectrum Analyzer Techniques for Frequency Stability Measurements | 1968 | 491 • 1L20 • 1L30 |
Patents that may apply to 1L20
| Page | Title | Inventors | Filing date | Grant date | Links |
|---|---|---|---|---|---|
| Patent US 3321712A | Phase lock system for spectrum analyzer | Arnie Frisch • Gordon D. Long | 1965-08-16 | 1967-05-23 | Spectrum Analyzers • 1L20 • 1L30 • 1L40 • 7L18 • Sampling |
Prices
| Year | Catalog price | In 2026 dollars |
|---|---|---|
| 1965 | $1,995 | ~$20,900 |
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
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Front
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Left
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Right
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Top
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Bottom
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Block Diagram
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RF and Phase Lock Block Diagram
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IF Block Diagram
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RF Section
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Phase Lock Circuit
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Wideband Amp and Mixer
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Sweeper
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IF Attenuator
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IF Amp, 70 MHz Oscillator and Mixer
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Variable Resolution Circuit
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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 • 1L30 • 1L40 • 1L60 • 3L10 • 512 • 532 • 535A • RM35A • 544 • 546 • 545 • 547 • 549 • 556 • 575 • 581 • 585 • A • B • C • CA • G • K • H • L • ML • M • N • O • R • S • Z • Pentrix L20 • Pentrix L30 |
| 152-112 | 152-112 • 152-0112-00 | Discrete component | step recovery diode | 4S2 • 1L20 • 1L30 |
| 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 • 1L40 • 491 |