MFJ-784B Instruction Manual
Installation Error! Main Document Only.-4
Setting Receive Audio Level (Input Level)
When first connecting the DSP filter and whenever the receiver audio level
changes, you should check the Input Level indicator. This LED indicates the
input signal level. As a signal is received, the Input Level LED will flash from
"off" to either green or red.
If the indicator flashes:
Mostly Green (never red) the input level is adjusted correctly.
Any Red the input level is too high.
Stays Off (or barely green) the input level is too low.
To set Receive Audio Adjust:
1. Tune your radio to the mode you will be operating most.
2. Set your
radio's
volume control to a normal level.
3. Use a screwdriver to adjust the Receive Audio Adjust (on the back panel
of the DSP) until the Input Level LED (on the front panel) flashes mostly
green and never red.
Note:
Some compromise may be required if the receiver does not maintain
the same audio level on different modes. Set the Receive Audio
Adjust on the DSP for the most common mode, and use the receiver's
volume knob to properly adjust the level when switching modes.
Increasing Headphone Audio Level
The MFJ-784B headphone level is attenuated as it comes from the factory. If
the speaker audio is at a comfortable level and the headphone audio is too
quiet, the headphone volume can be raised by using jumpers JMP 9 and JMP
10 (next to the headphones jack).
Warning: Do not short JMP 10 when using a mono phone plug or
damage to your unit will result.
To raise the headphone audio level for mono headphones, put a 470 ohm or
smaller resistor on JMP 9. For stereo headphones, put
another
470 ohm or
smaller resistor on JMP 10.
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