FM/LW/MW/SW-SSB DSP Receiver PL-330

Tecsun 德生通用电器制造有限公司 Tecsun General Electric Manufacturing Co., Ltd; Dongguan (Guangdong, SC)

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  • Year
  • 2020 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 331953

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

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Main principle
  • DSP, Digital Signal Processor
  • Wave bands
  • Broadcast, Long Wave, more than 2 x SW plus FM or UHF.
  • Power type and voltage
  • Storage Battery for all (e.g. for car radios and amateur radios) / Li-ion: 3.7 / Ext DC 5 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
  • Power out
  • 0.2 W (max.)
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: FM/LW/MW/SW-SSB DSP Receiver PL-330 - Tecsun 德生通用电器制造有限公...
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Dimensions (WHD)
  • 139 x 85 x 26 mm / 5.5 x 3.3 x 1 inch
  • Notes

  • Tecsun PL-330 is a DSP radio featuring AM, SSB and synchronous detection, direct frequency entry, manual scan, auto scan, Auto Tuning Storage (ATS), Enhanced Tuning Mode (ETM+) to create time-specific memories, clock, sleep timer, alarm, and FM stereo over headphones.

    Main specifications

    • Frequency coverage
      • LW: 153-513 kHz
        • Tuning steps: 9 kHz, 1 kHz
        • Sensitivity: <10 mV/m (26 dB S/N)
        • Bandwidth: 2.5, 3.5, 9.0 kHz
      • MW: 520-1710 / 522-1620 kHz
        • Tuning steps:
          • 522-1620: 9 kHz, 1 kHz
          • 520-1710: 10 kHz, 1 kHz
        • Sensitivity: <1 mV/m (26 dB S/N)
        • Bandwidth: 2.5, 3.5, 9.0 kHz
      • SW: 1711-29999 kHz
        • Tuning steps:
          • AM: 5 kHz, 1 kHz
          • SSB (USB,LSB): 5 kHz, 1 kHz, 10 Hz
          • Sync detection: 5 kHz, 1 kHz, 100 Hz 
        • Sensitivity: <20 µV (26 dB S/N)
        • Bandwidth: 
          • AM: 2.5, 3.5, 5.0 kHz
          • SSB: 0.5, 1.2, 2.2, 3.0, 4.0 kHz
      • FM: 64-108 / 76-108 / 87-108 / 88-108 MHz
        • Tuning steps: 100 kHz, 10 kHz
        • Sensitivity: <3 µV (30 dB S/N)
    • Selectivity: >60 dB all bands
    • Sync Detection Lock Range: +/- 1 kHz
    • IF Frequency (DSP Low-IF): 
      • AM: 45 kHz
      • FM: 128 kHz
    • 850 memories.
    • Speaker: 0.25 W, 8 Ω
    • Earphone Jack: 32 to 150 Ω, 3.5 mm, Stereo
    • Power Supply:
      • 3.7V BL-5C Li-ion battery
        • Quiescent current
          • FM/MW/LW: <25 mA
          • SW: <45 mA
        • Stand-by: < 90 µA
      • External DC 5V 500 mA thru USB charging port

    Non documented features

    Owners and testers have reported publicly in the forums that "hidden features" are found, starting at firmware version 3302 and above, similar to the ones found in the "big brother" Tecsun PL-990. Depending on the firmware version and production batches, these may already be included and documented. Among them, here are some interesting ones:

    • Display Firmware version: Radio Off, press and hold "VF/VM" key and look at the upper right corner.
    • Calibrate USB/LSB SSB sidebands: Radio ON, MW/LW/SW bands, SSB mode, tune into a strong well known frequency station, press SSB USB or LSB key, adjust until zero-beat, press and hold "LSB" or "USB" key until LCD display flashes.
    • Toggle internal ferrite antenna and external socket/telescopic antenna: Radio ON, MW/LW bands, press and hold "3" key, LCD display shows CH-A (Internal antenna), CH-5 (External antenna). Selecting external antenna would show SW in addition to MW or LW bands.
    • FM De-emphasis Time Constant: Radio ON, press and hold "4" key to toggle between 75 µS and 50 µS (this one seems to be listed in the official documentation as of Aug-2021).
    • Maximum audio level: Radio ON, press and hold "7" key, adjust level with Volume button, press "7" key to store. Each band/mode has a dedicated setting. Default level is 58.
    • Add seconds to the Clock: Radio OFF, press and hold "8" key to toggle the seconds digits (this one seems to be listed in the official documentation as of Aug-2021)..
    • Muting Threshold: Radio ON, press and hold "9" key, use tuning dial to set the value at the upper left corner, press Enter to store. Each band/mode have dedicated settings. Default value is 01.
  • Net weight (2.2 lb = 1 kg)
  • 0.210 kg / 0 lb 7.4 oz (0.463 lb)
  • Mentioned in
  • - - Manufacturers Literature (Tecsun PL-330 FM Stereo/LW/MW/SW-SSB Receiver User Manual)
  • Author
  • Model page created by Jose Mesquita. See "Data change" for further contributors.

 Collections | Museums | Literature

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The model FM/LW/MW/SW-SSB DSP Receiver is part of the collections of the following members.

 Forum

Forum contributions about this model: Tecsun 德生通用电器...: FM/LW/MW/SW-SSB DSP Receiver PL-330

Threads: 1 | Posts: 1

This Tecsun PL-330 model uses two main PCB's assembled in piggyback mode:

  • The Digital PCB - Marked as PL330KZ-V4.
    • ​Public pictures shows codes like 20-18, 20-19, or 20-29 (2020 weeks 18, 19, 29 dates?).
    • The heart of the radio receiver lies on a Silicon labs Si4735-D60 chip (IC2 marked as 3560). 
    • The control and management is handled by a unknown, customized obfuscated reference, "952DZ03 0C07AA" MCU chip (IC1)
    • The MCU uses a BL24C256A 256kbit 32KByte EEPROM (IC2).  
    • One 0.22F 5.5V super-capacitor handles the backup power supply whille changing the removable battery.
    • There is a 4-pin connector at the LCD display side (KP1) whose function is not documented.
  • The Analog PCB - Marked as PL330 DT&GF - V4 2020.3.6.
    • Public pictures shows codes like 20-18 or 20-29 (2020 weeks 18, 29 dates?).
    • The Audio amplification is designed around a CD1622CB dual channel power amplifier (IC1), driving the earphones in stereo mode thru a RC series limiters/filters, and the built-in speaker is driven in Mono mode in BTL (bridge) mode. Interestingly, the PCB silkscreen is marked as CXA1622.
    • The Power Supply section takes the 3.7VDC from the BL-5C removable battery or from the 5VDC USB port, to supply regulated voltage of 2.8V, a SW voltage for the SW RF Front-End, a +V unregulated voltage, and a battery charger circuit.
    • The RF Front-End uses a BAV99 (D1) at the telescopic antenna/antenna socket to protect the RF circuits. The FM signal is passively passed  to the Digital PCB to the DSP chip using a dedicated coaxial cable with RF connectors, bypassing the piggyback connector. The AM SW signals are passed thru the LC network to a two stage front-end (1Q1 and 1Q2) and then passed to the DSP in the Digital PCB using the piggyback connector (MW/SW pin). The AM MW signal is passively passed to the DSP chip (using the same MW/SW pin).

Jose Mesquita, 03.Nov.21

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