• Country
• People's Republic of China

• Manufacturer / Brand
• Unknown - CUSTOM BUILT: China

• Year
• 2023 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 356607

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, Long Wave, more than 2 x SW plus FM or UHF.

• Power type and voltage
• Batteries / addl. power jack / Li-Ion 3.7 / USB 5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)

• Material
• Metal case

• from Radiomuseum.org
• Model: Malachite DSP SDR Receiver V5 - Unknown - CUSTOM BUILT: China

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

• Dimensions (WHD)
• 162 x 74 x 29 mm / 6.4 x 2.9 x 1.1 inch

• Notes

• The Malachite DSP SDR Receiver V5 is distributed by DeepElec shop in China, and it is one of many commercial and DIY projects based on the original Malahit DSP1 project owned by Malahiteam. A few firmware variants exists, however as the Malahit DSP1 is a proprietary project, new official releases must be acquired from Malahiteam.

  Main specifications

  • Frequency range: 10 kHz - 250 MHz and 400 MHz - 2 GHz
  • Modulation type: AM, SSB, DSB, CW, NFM, WFM (Stereo RDS support)
  • Sensitivity: 0.3 µV up to 1 GHz
  • Dynamic range: 82 dB
  • Spectrum width: 160, 80, and 40 kHz
  • RF Front-End
    • Single antenna socket
    • Manual or Automatic input impedance selection (50 Ω or High-Z)
    • 20 dB LNA RF pre-amplifier
    • 0 - 31.5 dB RF attenuator controlled by software
    • Pre-selector with 10 band pass filters
  • DSP functions
    • Variable filter width
    • Adaptive squelch (NR)
    • Threshold squelch
    • Noise canceller (NB)
    • Automatic gain control(AGC)
    • Automatic notch filter (ANF)
    • Stereo FM with RDS support,
    • Audio Equalizer
  • Analog stereo output
  • 3.5" 480x320 Color LCD Touchscreen
  • USB-C port with support of CAT, IQ and audio when connected to a computer
  • Power supply: Built-in 3.7 V 5000 mAh lithium battery
  • Shipped with proprietary modified firmware version 1.10d

  Brief technical details

  The RF Tuner is divided in three sections, each one shielded by metal covers.The section 1 contains the Front-end LNA, attenuator and some pre-selector filters and RF switches. The section 2 contains the remaining pre-selector filters and RF switches. The section 3 contains the MSi001 RF Tuner chip by MIRICS (U15) and the NAU88C22 Audio CODEC and Speaker Driver chip (U1).

  A STM32H743-VIT6-V 480MHz, 32-bit ARM Cortex-M7, 1MByte Flash,, 512KByte RAM chip (U5) and a RS256B/FM25W256 32KByte F-RAM (U17) manages the radio.

  The power supply and control circuitry uses several active devices, namely a TP4056 battery charger (U20), four LDO regulator chips (U3, U32, U19, U23), and several transistors.

• Net weight (2.2 lb = 1 kg)
• 0.350 kg / 0 lb 12.3 oz (0.771 lb)

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

• Other Models

• Here you find 525 models, 503 with images and 29 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Unknown - CUSTOM BUILT: China