FOR-22 Pin-Out


The audio input / output via the DB-9 connector has a manual adjustment range via the front panel of the FOR-22 of 10dB. 
Additionally the FOR-22 output range is adjustable via an internal jumper connector for mic level, ifb level or line levels.  

  • Line level ------------------------- 0.0 dBu at 600 ohms

  • Clear-Com IFB level ------------ -15 dBu at 200 ohms

  • Microphone level ----------------- -55.0 dBu at 20 ohms

To set channel 1 for the desired level:

  1. Find jumper block JP100 on the circuit board.

  2. Move the jumper so that it connects the pair of jumper pins labeled

with the desired level (Line, IFB, or Mic).
To set channel 2, repeat the above procedure using JP200.
Attached below is a PDF with additional FOR-22 information.

FOR-22 White Sheet


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