Synthesizer AM/FM Stereo Tuner RT-840

Roland Electronics Co. Ltd., Rotel; Tokyo

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  • Year
  • 1982
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 308329

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • PLL, Phase-locked loop; ZF/IF 450/10700 kHz
  • Wave bands
  • Broadcast (BC) and FM or UHF.
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC) / 120 or 220 or 240 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Synthesizer AM/FM Stereo Tuner RT-840 - Roland Electronics Co. Ltd.,
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 430 x 66 x 304 mm / 16.9 x 2.6 x 12 inch
  • Notes

  • A synthesizer AM/FM stereo hi-fi tuner covering MW and FM with a digital frequency display. Press buttons for Standby, Mute Off/Mono, FM Manual Tuning, Memory, AM, FM, Tuning Down and Tuning Up, five preset buttons to retrieve stored radio stations, indicators for AM, FM, FM Stereo and 3 LED Signal Strength indicators. An adjustable AM ferrite bar antenna on the back, connections for AM and FM antennae, Line Output interconnect cable with phono plugs.

    Specification  
    FM Tuner Section  
    Usable Sensitivity (mono) 10.8dBf/1.9µV
    50dB Quieting Sensitivity Mono   15dBf/3.2µV
    Stereo  38dBf/45µV
    Signal-to-Noise Ratio  (at 65dBf) Mono    70dB
    Stereo  65dB
    Distortion (at 65dBf) 1 kHz 0.15% (mono), 0.6% (stereo)
    Frequency Response 10-14,000Hz ,+1.5dB, -1.5dB
    Capture Ratio 1.5dB
    Alternate Channel Selectivity (±400kHz) 60dB
    Spurious Response Rejection 78dB
    Image Response Ratio 60dB
    IF Response Ratio 75dB
    AM Suppression Ratio 50dB
    Stereo Separation 100Hz/1kHz/10kHz,
    35dB/45dB/35dB)
    Antenna 300Ω balanced, 75Ω unbalanced
    AM Tuner Section  
    Sensitivity 300µV/m
    Selectivity  30dB
    Signal-to-Noise Ratio 50dB
    Image Response Ratio 38dB
    IF Response Ratio 35dB
    Antenna Built-in ferrite loopstick antenna

    Versions/Power Requirements
    120 V AC 60Hz
    220 V AC 50Hz
    240 V AC 50Hz
    120/220/240 V AC 50/60Hz Switchable (not available in UK, Canada and Scandinavia)

    Power consumption:  8 watts

    Similar to the Rotel RT-840L LW/MW/FM model which additionally has LW.

  • Net weight (2.2 lb = 1 kg)
  • 3.1 kg / 6 lb 13.3 oz (6.828 lb)
  • Literature/Schematics (1)
  • - - Manufacturers Literature (Technical Manual for the RT-840 and RT-840L tuners dated Aug 82)
  • Literature/Schematics (2)
  • - - Manufacturers Literature (Owner's Manual for the RT-840 and RT-840L)
  • Author
  • Model page created by Howard Craven. See "Data change" for further contributors.

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