Matrix: What audio levels are affected by the JP100 / JP200 jumper blocks internally on the FOR-22 interface card
Question: What audio levels are affected by the JP100 / JP200 jumper blocks internally on the FOR-22 interface card?
Answer: The audio output is transformer isolated and affected by the JP100 / JP200 jumper settings for each channel. There is a jumper field for each channel that allows three basic operating levels depending on what type of external input is being driven (2-way radios, mixing consoles, IFBs, PCs etc). The following levels can be produced by each channel:
• 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.
See PCB drawing below for location of JP100 and JP200:
Answer: The audio output is transformer isolated and affected by the JP100 / JP200 jumper settings for each channel. There is a jumper field for each channel that allows three basic operating levels depending on what type of external input is being driven (2-way radios, mixing consoles, IFBs, PCs etc). The following levels can be produced by each channel:
• 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.
See PCB drawing below for location of JP100 and JP200:
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