NCS -C250C Instruction Manual page 16

Transmit Audio Adjustment Procedure
i. Adjust each radio for proper operation using it's standard microphone.
ii. Connect NCS Radio Cables between the C250C and each radio.
iii. Preset the Mic Level control to minimum (clockwise from inside,
counterclockwise from the bottom, of the C250C ).
iv. Preset all Radio level controls to midrange (clockwise from inside,
counterclockwise from the bottom, of the C250C ).
v. Adjust the Mic input level as follows:
vi. Select each radio in turn, press the Mic PTT, and adjust the respective output
level control for proper transmitter operation.
10.2 Receive Audio
If C250C is setup for VOX, adjust the volume control on each radio so that the Busy light
on the C250C associated with that radio lights with the lowest level normal received
audio.
10.3 User Programmable Functions
The NCS-C250C has four user programmable functions. To turn functions on or off,
perform the following:
1. Deselect all radios.
2. Press and hold the Mic PTT Button and the UNSEL MUTE button until both the
PA (green) and RPT (red) indicators above the PA/RPT button are illuminated.
The unit is now in User Programming Mode.
3. The SEL (red) indicators above RAD1-RAD4 buttons show the current status of
the functions. Red Indicator ON = Function On.
4. Momentarily press the desired Function button to toggle the function on or off.
5. Momentarily press the UNSEL MUTE button to exit the User Programming Mode.
To reset the unit to the factory settings, press and hold the SEL MUTE button while in
User Programming Mode. When the PA (green) and RPT (red) indicators turn off, the
unit has been reset.
DTMF Microphone – Function 1
If the DTMF buttons on a DTMF microphone are to be used to control the unit, turn
Function 1 ON. If DTMF tones received over a speaker cause false activation of unit
functions, turn off the DTMF function. The factory default for this function is OFF.
Sidetone – Function 2
This function is a Factory Installed Option. If the Sidetone Option is installed in
the unit at the factory, this button turns Sidetone On and Off. The Sidetone function
NCS-C250C Instruction Manual Rev J
Connect the microphone to the connector on the front or rear panel.
Turn the C250C on and, while speaking into the microphone, adjust the
Mic Level control until the Mic Level LED lights on voice peaks. If the mic
level will not adjust low enough, add an Impedance Jumper in the 600 or
200 Ohm location.
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