PLL FM Stereo/MW/SW/SW Sythesized World Receiver DE1105

Degen 深圳市德劲电子有限公司 Electronics Co. Ltd.; Shenzhen

Data
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  • Year
  • 2004 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 348220

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

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Superhet, double/triple conversion
  • Wave bands
  • Broadcast, more than 2 SW bands plus FM or UHF.
  • Power type and voltage
  • Batteries / addl. power jack / AA: 2 x 1.5; AA NiMH: 2 x 1.2; DC 6 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5 cm = 2 inch
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: PLL FM Stereo/MW/SW/SW Sythesized World Receiver DE1105 - Degen 深圳市德劲电子有限公司 Electronics
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Dimensions (WHD)
  • 75 x 118 x 24 mm / 3 x 4.6 x 0.9 inch
  • Notes

  • The DEGEN DE1105 is a pocket radio using PLL tuning with double heterodyne conversion on AM bands (MW and SW). FM stereo offered when using earphones.

    Specification summary:

    • FM: 70.00 - 108.00 MHz
      • Sensitivity: < 10 uV
      • Stepping 50 kHz and 100 kHz
    • MW: 522 - 1610 kHz
      • Sensitivity: < 1 mV/m
      • Stepping 1 kHz and 9 kHz
    • SW: 5.800 - 26.100 MHz
      • Sensitivity: < 20 uV
      • Selectivity: 40 dB
      • Stepping 1 kHz and 5 kHz
    • Memory presets: 1000
    • Tuning
      • ATS tuning
      • Jog dial manual fast/slow tuning
      • Memory scan tuning
      • Direct frequency entry tuning
    • 32 level digital volume with rotary control
    • Built-in smart charger circuit for Ni-MH batteries
    • Clock, sleep timer,and alarm
    • Built-in temperature monitor
    • Battery level monitor
    • 3.5mm stereo output socket
    • Power supply
      • 2 x AA dry cells
      • 2 x AA NiMH rechargeable batteries
      • 5 or 6 Volt (350mA) DC external adapter (Center Negative)

    Accessories:

    • Stereo headphones
    • External antenna
    • External power supply adapter
    • 2 x Ni-MH rechargeable batteries
    • Cloth cover.
    • Operation Manual
  • Net weight (2.2 lb = 1 kg)
  • 0.165 kg / 0 lb 5.8 oz (0.363 lb)
  • Author
  • Model page created by Jose Mesquita. See "Data change" for further contributors.

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The model PLL FM Stereo/MW/SW/SW Sythesized World Receiver is part of the collections of the following members.

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Forum contributions about this model: Degen 深圳市德劲电子有限公司: PLL FM Stereo/MW/SW/SW Sythesized World Receiver DE1105

Threads: 1 | Posts: 2

The Degen DE1105 design uses double heterodyne conversion on AM bands (MW and SW) and single conversion on FM band. The IF are:

  • FM: 10.7 MHz
  • AM 1st IF: 28.000 MHz
  • AM 2nd IF: 450 kHz

The AM 1st IF is therefore above the upper SW band limit of 26.100 MHz.

 

The radio uses two PCB assemblies:

  • MCU PCB.
    • So far only one PCB version is known 
      • DE1105S-1  REV.0.10  2005.07.04
    • At least two MCU Processor versions exist
      • DE11S-MCU  2007.05.14
      • DE11S-MCU  2009.05.27
  • Receiver PCB
    • So far only one version is known
      •  DE1105M-2  DEGEN  0120

The built-in speaker is a 12Ω 0.25W unit.

 

The two PCB assemblies are interconnect with a flexible flat cable. The silkscreen labels for each pin at the connector are:

  1.     vol
  2.     mute
  3.     ce
  4.     al
  5.     vcc
  6.     power
  7.     gnd
  8.     gnd
  9.     do
  10.     bass
  11.     st
  12.     clk
  13.     di
  14.     pwm
  15.     aga
  16.     agc
  17.     i/out
  18.     i/out    
  19.     batt (+)
  20.     batt (+)

 

The following component listings only cover the main devices.

Receiver PCB Ref. DE1105M-2 DEGEN 0120

Component side:

U3    TA7358AP  -   FM front-end 
U4    65N4    -  LDO Regulator, SOT-23-5 5-PIN IC SMD
Q9    K544E (2SK544E)    -    N-MOSFET VHF, Idss=2.5..6.0mA
Q17, Q27    YJ7 (2SK2394-7)   -     N-FET LN, HF, Idss=16..32mA, SOT-23
CF6   XTAL 27.550 MHz   -    Local 1st Oscillator for U2-AM_OSC
CF7   XTAL 28.000 MHz   -     AM 1st IF filter
CF3   CQ ZTB 456F16     -     456 kHz FILTER for U2-VCO
CF4   L10.7S    -   10.7 MHz FILTER
CF2   L10.7S    -   10.7 MHz FILTER
CF5   CQ R50I  -   450 kHz 4+1 PIN FILTER for U2-AM_IF_IN

Less Components side:

IC1    CD1622CB (EQ CXA1622M)  - Stereo power amplifier / mono BTL power amplifier;
U1     LC72122   -      PLL Frequency Synthesizer 20-pin smd 
CF1   XTAL         -      U1 Osc
U2     TA8132AF   -    3V AM / FM IF + MPX 

 


MCU PCB  Ref. DE1105S-1 REV.0.10 2005.07.04

Component side partially covered with metal shield:


U101    DE11S-MCU 2007.05.14  -  MCU Processor
U102    N14B           -  3-PIN SOT-23 SMD Voltage detector IC 1.4V, - Reset 
U103    ATMLH736  -  SOP-8 SOIC-8 Atmel 2048 x 8 (16K) SPI  EEPROM, 1.8v TO 5v, 
U104    65P 0 (also seen as 2C0)   - 5-PIN SOT-25 SMD LDO regulator 2.2V, 300mA XC62H series
Q101    NY               -  SOT-89 PNP power switching 2SA1213?  50v 2a 500mW
Q102    J6       -  SOT-23 NPN general purpose switching
Q103    J6       -  SOT-23 NPN general purpose switching
Q105    J6       -  SOT-23 NPN general purpose switching
Q106    M6      -  SOT-23 PNP general purpose switching
Q107    J6       -  SOT-23 NPN general purpose switching
D100    C3       -  SOT-323 dual fast switching diodes
D101    C3       -  SOT-323 dual fast switching diodes

Display/KB Side:

D117    LED display
D115    LED display
D120    LED keyboard
D119    LED keyboard
D118    LED keyboard
 

Note on schematic diagrams:

I could not find any complete circuit diagrams for this model. However the DEGEN DE1102 diagram is available for download and, while having different specifications namely a lower 10.7MHz 1st AM IF frequency (28MHz on the DE1105) or a manual Local/DX attenuator (Automatic attenuation adjust at the antenna input - AGA command) or a different PLL IC, is close enough to be used on the DE1105.

 

 

 

 

Jose Mesquita, 01.Aug.23

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