- HOW-TO add Memory Backup battery inside the AR-3500 radio -





- Procedure -
  1. Make backup battery circuit out of (a)Tree in line 1.5Volt standard cells,- or (b)Single 4.7/5Volt Lithium cell
  2. Remove cover (bottom side / speaker side)
  3. Locate connection at the position '5V' on the main circuit board,- Connect the Backup-battery package via the 1N4001 Diode
  4. Place Backup-battery package in sutable non-conducting cower inside the radio, Attach battery-pack to in sutable position.
  5. ReFit bottom cover. Operate the Radio as usual.
No additional adjustments needed!!

Other MODIFICATIONS and Documentation for the RANGER AR-3500
  • HOW-TO Enter 24.900MHz scanning program on the RANGER AR-3500 (in .txt format smal file)
  • HOW-TO add Memory Backup battery inside the AR-3500 radio
  • HOW-TO disable key-beep on the AR-3500 Radio.
  • AR-3500 User manual (in .pdf format 2.9Mb file)
  • AR-3500 Schematic diagram/Circuit drawing (in .jpg format 290Kb file)

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