FM/AM Modulation Meter TF2300

Marconi Instruments, Marconi-Ekco (MI, MEI)

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  • Year
  • 1969
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 366365

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • Line / Batteries (any type) / 45-500 Hz, 95 to 130 / 190-260 V or DC: 24 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: FM/AM Modulation Meter TF2300 - Marconi Instruments, Marconi-
  • Shape
  • Tablemodel, with any shape - general.
  • Dimensions (WHD)
  • 470 x 190 x 360 mm / 18.5 x 7.5 x 14.2 inch
  • Notes

  • The Marconi TF2300 is a wide‑range FM/AM modulation meter designed for laboratory, broadcast, and service‑shop applications where accurate measurement of carrier deviation and modulation depth is required. It combines a broadband RF input system with precision IF processing to provide stable, repeatable readings across a large frequency span.

    RF Input & Frequency Coverage

    • Accepts carrier frequencies from approximately 4 MHz to 1000 MHz.
    • Utilises a broadband front‑end with switched preselection to maintain sensitivity and minimise spurious responses.
    • Provides 50 Ω input impedance with calibrated input level ranges.

    FM Measurement System

    • Employs a limiter/discriminator IF chain to extract frequency deviation.
    • Offers selectable IF bandwidths to optimise performance for narrowband or broadcast‑grade FM.
    • Provides direct deviation readout with selectable scales for typical communications and broadcast standards.

    AM Measurement System

    • Measures amplitude modulation depth using a precision envelope detector.
    • Supports AM carriers up to roughly 350 MHz.
    • Includes selectable time constants for tone, voice, and telemetry applications.

    Oscillator Facilities

    • Incorporates an internal oscillator system for IF alignment and calibration.
    • Accepts an external oscillator input for specialised measurement setups or higher‑stability requirements.

    Metering & Outputs

    • Large analogue meter movement with mirrored scale for parallax‑free readings.
    • Provides audio outputs for monitoring demodulated FM or AM signals.
    • Includes test points for service alignment and external analysis.

    Applications

    • Two‑way radio servicing
    • Broadcast transmitter alignment
    • Laboratory signal analysis
    • General RF modulation measurement

    See later enhanced version TF2300B.

  • Net weight (2.2 lb = 1 kg)
  • 13.6 kg / 29 lb 15.3 oz (29.956 lb)
  • Mentioned in
  • - - Manufacturers Literature (Instruction Manual No. EB2300.)

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