RMS-451

Unitra ZRK, Zaklady Radiowe im. M. Kasprzaka

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  • Year
  • 1983 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 106986
    • Brand: Unitra

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

 Technical Specifications

  • Number of Transistors
  • 16
  • Main principle
  • Superheterodyne (common); ZF/IF 465/10700 kHz
  • Wave bands
  • Broadcast, Long Wave and FM or UHF.
  • Details
  • Cassette-Recorder or -Player
  • Power type and voltage
  • Line / Batteries (any type) / 220 / 6 x 1,5 Volt
  • Loudspeaker
  • 2 Loudspeakers
  • Power out
  • 2 W (undistorted)
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: RMS-451 - Unitra ZRK, Zaklady Radiowe im
  • Shape
  • Portable set > 8 inch (also usable without mains)
  • Dimensions (WHD)
  • 328 x 195 x 82 mm / 12.9 x 7.7 x 3.2 inch
  • Notes

  • Stereo-Radio-Recorder RMS-451 empfängt FM nach OIRT (65 - 74 MHz) und hat 2 eingebaute Mikrofone. Frequenzgang Kassette 60 Hz - 10 kHz. Ausgangsleistung 2x 1 Watt.

    Exportiert nach D und vertrieben von HGS Münster als RRS4050.

    Besides the discrete transistor devices handling the cassette section and FM front-end, the receiver  section uses four integrated circuits:

    • 1 x U416B FM IF/MUX and AM Receiver, by TFK (AEG-Telefunken)
    • 1 x MC1309 FM stereo decoder
    • 2 x UL1482K audio power amplifier, by UNITRA (eq. to TBA820 II on 14-QIP package)

    The U416B  IC is seen on other brand models, like the SABA Cassette Clock 5.

     

  • Net weight (2.2 lb = 1 kg)
  • 2.7 kg / 5 lb 15.2 oz (5.947 lb)
  • Literature/Schematics (1)
  • -- Original-techn. papers. (Service manual 1st Ed. dated 1983)
  • Author
  • Model page created by Franz Scharner. See "Data change" for further contributors.

 Collections | Museums | Literature

Collections

The model is part of the collections of the following members.

 Forum

Forum contributions about this model: Unitra ZRK, Zaklady: RMS-451

Threads: 1 | Posts: 3

From the UNITRA service manual it seems that there is one additional IC used for motor speed stabilization  besides the four other IC's used on the receiver section.

This is the UNITRA UL1901, installed on a small PCB attached to the motor case. It is still possible to find the datasheet for the UL1901 in the Internet, but could not find any equivalents.

I do not have this radio model, but would like to have some additional information from owners of this model concerning the motor driver. 

Thank you.

 

Jose Mesquita, 20.Dec.23

Weitere Posts (3) zu diesem Thema.