Tektronix Type 1L30 Spectrum Analyzer Plug-In 25 MHz-10.5 GHz Oscilloscope

Tektronix Type 1L30 Spectrum Analyzer Plug-In 25 MHz-10.5 GHz Oscilloscope

The Tektronix Type 1L30 is a spectrum analyzer plug-in unit covering a frequency range of 25 MHz to 10.5 GHz. It is designed to plug into Tektronix 560-series oscilloscope mainframes, converting the host mainframe into a swept-frequency spectrum analyzer. The front panel provides a full complement of RF measurement controls including IF center frequency tuning, stepped IF attenuation, dispersion range selection, and a phase lock section with internal and external reference inputs.

Specifications & What's Included

• Model: Tektronix Type 1L30 Spectrum Analyzer Plug-In Unit
• Frequency Range: 25 MHz to 10.5 GHz (0.025 GHz to 10.5 GHz)
• IF Attenuation: Stepped rotary switch — Off, 1, 2, 4, 8, 16, 20 dB
• IF Center Frequency: Tunable via front-panel knob (coarse and fine)
• Dispersion Range: Selectable V/div and MHz/div ranges
• Vertical Display Modes: Log, Linear, Square Law
• Phase Lock Section: Fine tune, Lock, Check, Internal/External reference, 1 MHz Cal, Ref Freq In, Mixer Peaking controls
• RF Input: BNC connector (front panel)
• Sweep Input: BNC connector (front panel)
• Video Output: BNC connector (front panel)
• To Recorder Output: BNC connector (front panel)
• Rear Interface: 10-pin gold-contact edge connector for Tektronix 560-series mainframe mating
• Sawtooth Selector (rear panel): 100V / 150V voltage options
• Manufactured by Tektronix, Inc., Portland, Oregon, USA
• Included: Plug-in unit only — no mainframe, cables, or documentation included

Applications

The Type 1L30 is a mid-1960s Tektronix plug-in from the era when Tektronix dominated the laboratory instrument market with its modular 560-series mainframe system. The 560-series allowed a single oscilloscope chassis — such as the 561A, 564, or 565 — to be reconfigured for a wide variety of measurements by swapping plug-in modules. The 1L30 extends that platform into microwave spectrum analysis, covering frequencies from 25 MHz up through 10.5 GHz, which made it useful for RF and microwave signal characterization work in defense electronics, communications research, and university laboratories. The phase lock section allows the analyzer to lock to a stable reference frequency for precise frequency measurements, a feature important for characterizing microwave oscillators and transmitters. Today these plug-ins are sought by vintage instrument collectors, Tektronix 560-series mainframe owners who want to restore full lab capability, and engineers working on legacy RF systems that require period-appropriate test equipment.