Shure SCM800 User Manual page 10

CHANGE LIMITER THRESHOLD
All three threshold settings (+16, +8 and +4 dBm) can be changed. To
shift the threshold down by 6 dB, resistor R will be 82 kΩ. To shift the
limiter thresholds up by 6 dB, R will be 330 kΩ.
LOCAL AUX OPERATION
With linked mixers, the Aux input from a modified mixer does not link.
SEND/RETURN (INSERT) TO DIRECT OUT
Changes a channel's ¼-inch insert jack to a Direct Out jack.
SEND/RETURN TO DIRECT OUT POST-FADER
A channel's Insert phone jack can be changed to Direct Out, post-fader.
REMOTE VOLUME CONTROL OF CHANNELS
The channel, aux, or master levels can be controlled remotely by a
dc voltage via an external VCA (Voltage Controlled Amplifier). An
example of an external VCA is the ST-VCA1 from Radio Design Labs
(1–800–281–2683 or www.rdlnet.com).
Procedure:
1. Remove resistors R9177 and R9180.
2. Install new resistor R at jumper X907.
Procedure:
Remove resistor R9024.
Procedure:
1. Remove resistors at X101, X102, X105 and X106, and X808 if
modifying channel 8.
2. Short jumpers R1011 and R1020.
Procedure:
1. Remove resistors at X101, X102 and X105.
2. Short jumpers at R1020.
Procedure:
For channel control:
1. Connect the tip of a ¼-in. connector to the line input of the VCA,
and the sleeve to the ground of the VCA.
2. Connect the ring to the line output of the VCA.
3. Plug the ¼-in. connector to the Insert jack of the SCM800.
4. Set the channel level control should be set to 5.
For Aux In control:
1. Connect the external source to the VCA line input.
2. Connect the VCA line output to the tip and sleeve of the SCM800
Aux input.
3. Set the Aux control to 5.
For Master control:
1. Connect SCM800 Line output to the VCA line input.
2. Connect the VCA line output to the external device (amplifier,
tape recorder, etc.).
3. Set Master control to 5.
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