• Country
• People's Republic of China

• Manufacturer / Brand
• Hanrongda Electronic Co. Ltd.; Shenzhen

• Year
• 2023 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 356993

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

• Number of Transistors
• Semiconductors present.

• Semiconductors

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

• Details
• HD or solid state memory

• Power type and voltage
• Batteries / addl. power jack / Li-Ion 3.7 / USB 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: FM/MW/SW/AIR/U.VHF/WB RECEIVER BT TF PLAYER HRD-757 - Hanrongda Electronic Co. Ltd.;

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

• Dimensions (WHD)
• 138.3 x 86.5 x 30.7 mm / 5.4 x 3.4 x 1.2 inch

• Notes

• The HanRongDa HRD-757 multiband receiver features a flashlight, clock, alarm, sleep timer, calendar, thermometer (Celsius or Fahrenheit), Bluetooth, TF card slot for media player and recorder, sound equalizer, and remote control via dedicated App for Android and IOS.

  Main features

  • FM: 64.0 - 108.0 MHz, 4 sub-bands, 100 kHz steps, 50/100/150/200 kHz bandwidth
  • MW: 520 - 1710 kHz, 9 or 10 kHz steps, 3 kHz bandwidth
  • SW: 3.20 - 30.0 MHz (AM). 14 sub-bands, 5 kHz steps, 5 kHz bandwidth
  • V.UHF: 25.0 - 9999.0 MHz (NFM), 23 sub-bands, 25 kHz steps, 1.70/2.0/2.5/3.0/3.75/4.0/4.25/4.5 kHz bandwidth
  • AIR: 118.0 - 138.0 MHz (AM), 7 sub-bands, 5 kHz bandwidth
  • WB: 162.400 - 162.550 MHz (NFM), 3 kHz bandwidth
  • Manual, direct entry, or automatic with store tuning
  • Memory presets: 1000 (200 per band)
  • DX/Local selector
  • 3.5mm external antenna jack
  • 3.5mm stereo earphones jack
  • TF card: Maximum 256GB (MP3, WMA, WAV, APE, FLAC)
  • USB-C charging and data port
  • Only accepts rechargeable 18650 batteries with (+) flat top type
  • 3 Watt speaker in sealed cavity

   

  Brief technical details

  The unit described here has the PCB assembly with the reference "DSP-757 V1.6  2024.03.27".  At least one older version exists with the reference "DSP-757 V1.4  2023.11.28"

  The radio is built around a AKC6958 QFN32 package, FM,TV,MW,SW,LW,WB DSP tuner chip (IC1) able to receive from 30 to 230MHz in FM and 0.15 to 30MHz in AM, using dedicated RF inputs for MW, SW, and FM. The RF front-end uses a R25/2SC3356-R25 NPN transistor (Q1) and a C3/1SS302 diode set (D15) for antenna protection. MW band reception uses a dedicated, small, internal magnetic antenna.

  An additonal piggyback  PCB with the reference "WT-MODULE1 - DSP-M9 V1.1 tuner" handles the V.UHF band. It features an unmarked IC that matches the BK4819 analog two way radio pinout with a 26.000MHz xtal, another unmarked IC that matches the 3418/AW13418QNR SP8T switch IC, a 2057/RS2057 SPDT analog switch IC, and a R25/2SC3356-R25 NPN transistor.

  The speaker is driven by a LTK5302 Boost Audio Power Amplifier (IC4). The earphones are driven by IC1.

  A CXXC14B5C BlueTooth media player by A3 (IC2) manages the radio and uses a VK2C23A for LCD driver (IC7), and a DS18B20 1-Wire Digital Thermometer (IC3) to measure the temperature inside. 

  Additional active components are used for control and power supply, like a P14C13 by Prisemi (IC6) for Over-Voltage-Protection, a F9Ha/ D45/CL4056D battery charger, a few SBWI/L regulators by MICRONE (IC8, IC9, IC11), several HM2301B P-MOSFET transistors (Q4, Q6, Q7, *1), and NPN/PNP several transistors 

   

• Net weight (2.2 lb = 1 kg)
• 0.250 kg / 0 lb 8.8 oz (0.551 lb)

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

• Other Models

• Here you find 5 models, 5 with images and 5 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hanrongda Electronic Co. Ltd.; Shenzhen