FM/AM Walkman Sports SRF-85

Sony Corporation; Tokyo

Data
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Collections

  • Year
  • 1992 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 235163

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

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Superheterodyne (common)
  • Wave bands
  • Broadcast (BC) and FM or UHF.
  • Power type and voltage
  • Dry Batteries / 1 x 1,5 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: FM/AM Walkman Sports SRF-85 - Sony Corporation; Tokyo
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Dimensions (WHD)
  • 65 x 97 x 24 mm / 2.6 x 3.8 x 0.9 inch
  • Notes

  • The Sony FM/AM Walkman FM Stereo-AM Radio Model Sports SRF-85 was releaased in two major variants, distributed between at least four identified models:

    • US Model
    • Canadian Model
    • AEP Model
    • E Model

    Major technical variants:

    • North America (US Model, Canadian Model)
      • FM: 87-6-108 MHz  
      • AM: 530-1710 kHz
      • Band selector: AM, FM Local, FM DX
    • Other Countries (AEP Model, E Model)
      • FM: 87-6-107.5 MHz  
      • AM: 531-1602 kHz
      • Band selector: AM, FM Mono, FM Stereo

    Water-resistant design with water-resistant stereo headphones.
    AVLS (Auto Volume Limiter System).
    Belt clip and combination swivel mount arm band/hand grip supplied.

    This model uses a special high performance Sony CXA1129N radio IC, For additional technical details, please see the Sony SRF-49 model.

     

  • Net weight (2.2 lb = 1 kg)
  • 0.096 kg / 0 lb 3.4 oz (0.211 lb)
  • Author
  • Model page created by Franz Scharner. See "Data change" for further contributors.

 Collections | Museums | Literature

Collections

The model FM/AM Walkman Sports is part of the collections of the following members.

 Forum

Forum contributions about this model: Sony Corporation;: FM/AM Walkman Sports SRF-85

Threads: 1 | Posts: 1

This radio unit was sold as in good order, however the AM (MW) band was defective. I could only hear some background noise with a constant level across the band frequencies.

Initially the unit did not work at all, but a quick inspection revealed that the headphone plug was loose in the three contacts that should be soldered on the PCB. Additionally, the cabinet had signs of heavy falls, showing a few dents and hairlines.

Being such a small circuit with minimal components, the fault would be easy to find. Indeed, the ferrite antenna two coils were broken at the support terminals (small PCB piece), again confirming the heavy falls that this unit was subjected to.

A quick and dirty fix was to remove the ferrite antenna to solder thin tinned copper wires over the broken PCB traces, and then reinsert the set into the main PCB. 

The original wax was reheated to spread on the support of the antenna, as it was before.

The AM reception was restored, where the radio showed very high sensitivity and excellent selectivity as it is expected for radios using the Sony high performance CXA1129N tuner IC.

 

Jose Mesquita, 14.May.21

Weitere Posts (1) zu diesem Thema.