• Année
  • 2002 ?
  • Catégorie
  • Radio - ou tuner d'après la guerre 1939-45
  • Radiomuseum.org ID
  • 327762

Cliquez sur la vignette du schéma pour le demander en tant que document gratuit.

 Spécifications techniques

  • No. de transistors
  • 8
  • Principe général
  • Super hétérodyne, conversion double ou triple
  • Gammes d'ondes
  • PO, plus que 2 x OC et FM
  • Tension / type courant
  • Batteries / Alim. BT séparée avec fiche / AA: 2 x 1.5 / DC 3 Volt
  • Haut-parleur
  • HP dynamique à aimant permanent + bobine mobile / Ø 4.5 cm = 1.8 inch
  • Puissance de sortie
  • 0.15 W (qualité inconnue)
  • Matière
  • Plastique moderne (pas de bakélite, ni de catalin)
  • De Radiomuseum.org
  • Modèle: Short Wave Dual Conversion R-9710 - Tecsun 德生通用电器制造有限公...
  • Forme
  • Portable, appareil de poche. Taille < 20cm
  • Dimensions (LHP)
  • 118 x 75 x 29 mm / 4.6 x 3 x 1.1 inch
  • Remarques
  • The Tecsun R-9710 is a small portable analog radio offering FM stereo (when listening with earphones), MW (AM), and eight SW bands featuring dual conversion where the first discrete local oscillator uses eight crystals for improved stability, one per SW band.

    Frequency coverage

    • FM: 87 - 108 MHz (IF: 10.7 MHz)
    • MW: 525 - 1710 kHz (IF: 455 kHz)
    • SW: 5.95 - 21.85 MHz (1st IF: 10.7 MHz; 2nd IF: 455 kHz)
      • SW1: 5.90 - 6.20 MHz
      • SW2: 7.10 - 7.30 MHz
      • SW3: 9.50 - 9.90 MHz
      • SW4: 11.65 - 12.05 MHz
      • SW5: 13.60 - 13.80 MHz
      • SW6: 15.10 - 15.60 MHz
      • SW7: 17.55 - 17.90 MHz
      • SW8: 21.45 - 21.85 MHz

    Sensitivity

    • FM: <10 uV
    • AM: <1 mV/m
    • SW: <30 uV

    Selectivity: >20dB

    Included accessories

    • Stereo earphones
    • Carrying pouch
    • External FM/SW soft antenna (13 ft)
    • English manual

    Some technical details

    The design is built around the TA2111F AM/FM radio tuner IC1 and the CXA1622M dual channel audio power amp IC2.

    The MW band uses a large antenna ferrite bar to improve the reception, as it is connected to the TA2111F AM RF input without front-end amplification.

    The FM band uses a 2SC9014 Si transistor VT8 and a LC band pass filter L1/C4 as RF front-end to improve the reception.

    The SW bands uses a 2SK544 FET VT2 as RF front-end/mixer where the 1st local oscillator is handled by a 2SC9018 VT5 and 8 x Crystals, one per band. The 1st IF runs at 10.7MHz and is passed thru T1 transformer to be amplified by a 2SC9018 VT1 and then passed to the IC1 via CF3 10.7 MHz ceramic filter.

    The radio can operate from a external 3V DC power adapter using a 3.5mm jack, where the positive pole is on the outside and negative pole on the center. To protect the internal  components against inadequate or malfunctioning power adapters, one 1N4737 7.5V 1 Watt Zenner diode VD6 is configured in parallel with the Vcc line.

  • Prix de mise sur le marché
  • 24.00 USD
  • Auteur
  • Modèle crée par Didier Tholomier. Voir les propositions de modification pour les contributeurs supplémentaires.

 Collections | Musées | Littérature

Collections

Le modèle Short Wave Dual Conversion fait partie des collections des membres suivants.

 Forum

Contributions du forum pour ce modèle: Tecsun 德生通用电器...: Short Wave Dual Conversion R-9710

Discussions: 1 | Publications: 1

In my Tecsun R-9710 with PCB Rev. R-9710V13 with production date of 2014.10.20, the indicated integrated circuits in the schematic diagram have been replaced with Chinese equivalents, as follows:

Component Original schematic diagram R-9710V13 2014.10.20 production
IC1 Toshiba TA2111F Silan SA2111CB
IC2 Sony CXA1622M Huajing CD1622CB

 

Jose Mesquita, 04.Nov.21

Weitere Posts (1) zu diesem Thema.