• Country
• People's Republic of China

• Manufacturer / Brand
• Retekess Technology Co., Ltd.; Shenzhen

• Year
• 2022 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 349967

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

• Number of Transistors
• 5

• Semiconductors

• Main principle
• DSP, Digital Signal Processor

• Wave bands
• Broadcast, more than 2 SW bands plus FM or UHF.

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

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4 cm = 1.6 inch

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Wide Frequency Radio Receiver TR110 - Retekess Technology Co., Ltd.;

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

• Dimensions (WHD)
• 60 x 111 x 20 mm / 2.4 x 4.4 x 0.8 inch

• Notes

• The Retekess TR110 FM.MW.SW.AIR.CB/VHF.UHF.WX.HAM Wide Frequency Radio Receiver  is a pocket unit featurig a variety of modulation modes like AM, WFM, NFM, and SSB (USB/LSB).

  This radio is sold under other brands like Raddy model RF760 or HanRongDa model HRD-747. All share the same chassis and cabinet. At least four chassis versions are known.

  Some specification discrepancies have been noted between the radio behavior and the user guide, like the claimed ability to receive VHF on WFM modulation; the recent production batches only allows NFM. A notable non-documented feature extend the MW band to receive LW when using an external antenna.

  Main features

  • FM:
    • Coverage: 64 - 108, 76 - 108, 87.5 - 108 MHz
    • Stepping: 10.0, 50.0, 100.0 kHz
    • De-emphasis: 50, 75 uS
    • Bandwidth: 110, 84, 60, 40 kHz
    • Modulation: WFM
    • Sensitivity: 1 μV
  • MW:
    • Coverage: 
      • 520 - 1710 kHz (10, 5 kHz steps)
        • 150 - 1710 kHz (10, 1 kHz steps) on ext. antenna
      • 522 - 1710 kHz, (9, 3 kHz steps)
        • 153 - 1710 kHz (9, 1 kHz steps) on ext. antenna
    • Bandwidth: 6, 4, 3, 2.5, 2, 1.8, 1 kHz
    • Modulation: AM
    • Sensitivity: 1.5 mV/m
  • SW:
    • Coverage: 3.20000 - 30.00000 MHz continuous scan (14 sub-bands)
    • Stepping: 5, 1, 0.1, 0.02, 0.01 kHz
    • Bandwidth: 6, 4, 3, 2.5, 2, 1.8, 1 kHz
    • Modulation: AM, SSB (USB), LSB
    • Sensitivity: 10 μV
  • AIR:
    • Coverage: 118.0000 - 138.0000 MHz continuous scan (5 sub-bands)
    • Stepping: 25, 12.5, 8.3 kHz
    • Bandwidth: 6, 4, 3, 2.5, 2, 1.8, 1 kHz
    • Modulation: AM
    • Sensitivity: 1 μV
  • CB:
    • Coverage: 25.00000 - 28.00000 MHz
    • Stepping: 5, 1, 0.1, 0.02, 0.01 kHz
    • Bandwidth: 6, 4, 3, 2.5, 2, 1.8, 1 kHz
    • Modulation: AM, NFM
    • Sensitivity: 10dBμV
  • VH/UHF: 
    • Coverage: 30.0000 - 520.0000 MHz continuous scan (8 sub-bands)
      • VHF: 30.0000, 136.0000, 174.0000, 220.0000 MHz
      • UHF: 409.0000, 446.0620, 462.5620, 443.0000 MHz
    • Stepping: 25, 12.5, 7.5, 5, 1 kHz
    • Bandwidth: 4.5, 3.75, 2.5, 1.7 kHz
    • Modulation: NFM
    • Sensitivity: -9dBμV
  • WX: (North American weather band)
    • Coverage: 162.4000 162.5500 MHz (7 fixed frequencies)
    • Bandwidth: 3 kHz
    • Modulation: NFM
    • Sensitivity: -9dBμV
    • Scan abd Alert mode (NOAA)
  • Squelch with 9 levels for SW, AIR, CB, and VHF/UHF bands
  • Manual and ATS tuning
  • 1000 memory presets
  •  
  • 3.5 mm Stereo earphone jack
  • 3.5 mm External antenna jack
  • USB-C port for battery charging
  • Digital thermometer
  • Clock, Sleep timer, and Alarm

  Brief technical details

  There are at least four revisions of the PCB assembly. Please see the schematic diagrams for details:

  • BY-747 V2.6 2021.4.15
  • BY-747 V3.6 2021.9.23
  • BY-747 V4.2 2022.11.11
  • BY-747 V5.0 2023.5.18

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

• Other Models

• Here you find 6 models, 6 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Retekess Technology Co., Ltd.; Shenzhen