• Country
• People's Republic of China

• Manufacturer / Brand
• Prunus (Shenzhen Jinming Technology Co., Ltd); Shenzhen

• Year
• 2019

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 333167

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

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• DSP, Digital Signal Processor

• Wave bands
• Broadcast (BC) and FM or UHF.

• Power type and voltage
• Dry Batteries / AAA: 2 x 1.5 Volt

• Loudspeaker
• - only for Earphone!

• Power out
• 0.015 W (max.)

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Prunus FM Stereo/AM 2 Band Receiver J-982 - Prunus Shenzhen Jinming

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 42 x 83 x 17.3 mm / 1.7 x 3.3 x 0.7 inch

• Notes

• Main specifications

  • Receiver coverage
    • AM: 530 - 1600 kHz
    • FM: 87 - 108 MHz
  • Noise limit sensitivity: FM < 10 uV, AM < 1 mV/m
  • 3.5 mm earphone socket
  • Earphones (Stereo) impedance: 32 Ohm
  • AM / FM / FM Stereo selector switch
  • Power OFF / ON / BBS (bass reinforcement) selector switch

  Some technical details

  This observations were taken from a unit with a PCB identified as "MODEL:6106 REV:01 USE:FR4 T1MM 2019 01 15".

  This model was designed around the KT Micro KT0932 (U1 in the PCB) DSP AM / FM Stereo Receiver with built-in MCU and Class AB amplifiers able to drive earphones. This chip features analog-like tuning by using a 20K potentiomer (VR2 in the PCB) for band scan. On this radio model, soft-muting was enabled during station scan. 

  Available with either white or black case.

  Note: KT Micro produces two versions of the KT093x(M) series. The KT093x features FM Stereo on a SMD 20-pin package. The KT093xM features FM Mono on a SMD 16-pin package. Therefore the package pinout is incompatible between the KT0932 and the KT0932M.

  One 24C02N (U2 in the PCB) 2kbit serial EEPROM is used by the KT0932 to initialize its operation mode with configuration data stored beforehand in this EEPROM.

  The dual channel audio output of the KT0932  is then passed to audio amplifier stage with selectable BBS (bass reinforcement) supported by one 358A dual operational amplifier (IC1 on the PCB) and one LPA4809M (U4 in the PCB) unity gain stable audio power amplifier to drive the earphones.

   

   

• Net weight (2.2 lb = 1 kg)
• 0.030 kg / 0 lb 1.1 oz (0.067 lb)

• Mentioned in
• - - Manufacturers Literature (Introduced in 2019)

• Author
• Model page created by Jose Mesquita. See "Data change" for further contributors.

• Other Models

• Here you find 2 models, 1 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Prunus (Shenzhen Jinming Technology Co., Ltd); Shenzhen