• Pays
• Japon

• Fabricant / Marque
• Sony Corporation; Tokyo

• Année
• 1997–2002 ?

• Catégorie
• Radio - ou tuner d'après la guerre 1939-45

• Radiomuseum.org ID
• 329028

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

• No. de transistors
• Semi-conducteurs présents

• Semi-conducteurs

• Principe général
• Super hétérodyne (en général); Appareillage spécial ? Renseignements souhaités SVP.

• Gammes d'ondes
• PO et FM

• Tension / type courant
• Piles sèches / AA 1.5 Volt

• Haut-parleur
• - Seulement pour écouteur

• Puissance de sortie
• 0.0036 W (sans distorsion)

• Matière
• Plastique moderne (pas de bakélite, ni de catalin)

• De Radiomuseum.org
• Modèle: FM/AM Walkman FM Stereo SRF-49 [North America] - Sony Corporation; Tokyo

• Forme
• Portable, appareil de poche. Taille < 20cm

• Dimensions (LHP)
• 63 x 92.9 x 26.2 mm / 2.5 x 3.7 x 1 inch

• Remarques

• The Sony SRF-49 offered two major variants, one being the Canadian / E models (aka North America), and the other being the AEP / UK / Australian models, differing in several specifications and features, like AM band coverage, output power and headphones impedance, and FM Mode vs FM Sensitivity. See details below.

  Specifications

  • Receiver Bands
    • FM: 87.5 - 108 MHz, Stereo output
    • AM: 530 - 1701 KHz (North America)
    •         526.5 - 1606.5 KHz (Italy)
    •         530 - 1605 KHz (Other Countries)
  • Audio output
    • North America and UK: 3.6mW+3.6mW at 10% HD on 32 Ohm headphones
    • Other Countries: 4.3mW+4.3mW at 10% HD on 16 Ohm headphones
  • Battery life: Approx. 40 hours (North Ameriac and UK), 35 hours (Other Countries

  Special technical features

  The SRF-49 shares the very special and proprietary Sony CXA1129N-T4 30-pin radio integrated circuit (IC1) with several other Sony pocket radios, like the 1992 SRF-39, the 1992 SRF-85 (Sports edition), the 1999 PSY-03, the 2001 SRF-59, and more recent radios like the SRF-S80, SRF-S83, SRF-S84, and SRF-87.

  In 1992 Sony released a technical paper entitled "Advanced Low Voltage Single Chip Radio IC", published on IEEE, describing unconventional techniques at the time to be able to offer excellent AM and FM Stereo sensitivity (S/N 6dB @ 10 dBuV AM, S/N 30 dB @ 10 dBuV FM), sensitivity (40 dB FM, 35 dB AM), image rejection (39 dB FM, 41 dB AM), S/N ratio (50 dB AM, 60 dB FM), low distortion (THD 0.3% AM, THD 0.1% FM), using a working very low power supply voltage at around 0.95 Volt for a new integrated circuit design requiring minimal external parts without compromising the performance.

  A complex image cancelling design using two double balanced mixers in quadrature and phase shift network offers very effective image cancelling, using very low IF values without image interference and therefore allowing to use internal active low Q filters (<20).

  AM IF is specified at 55KHz. 

  FM uses Double Conversion, where the 1st IF is specified at 30MHz, and the 2nd IF at 150KHz.

  Additional technical details

  The CXA1129N-T4 (IC1) is complemented with one LA4537M Stereo Audio Power Amplifier integrated circuit (IC2).

  One single PNP Si 2SA733 transistor (Q1) is used on the Canadian and E models variants as a battery power regulator, while the other models variants uses a bypass conductor (Q1).

  See also SRF-39.

   

• Auteur
• Modèle crée par Jose Mesquita. Voir les propositions de modification pour les contributeurs supplémentaires.

• D'autres Modèles

• Vous pourrez trouver sous ce lien 4071 modèles d'appareils, 3928 avec des images et 976 avec des schémas.
  Tous les appareils de Sony Corporation; Tokyo