Specifications

International Radio and Electronics Corporation
25166 Leer Drive Elkhart, Indiana 46514 • 574–262–8900 • www.irec1.com
3
-
2
3.2 Controls and Display
Before operating the transmitter, take time to become familiar with the controls and
indicators.
3.2.1 Front Panel
Audio Processor Input Display : Two vertical bar graphs for the left and right channels
indicate the relative audio levels, in 1.5 dB steps, at the input of the audio processor.
Under normal operating conditions, the left and right Audio Processor indicators will be
active, indicating the relative audio input level after the input sensitivity setting.
Modulation Display : A 20–segment, vertical peak-and-hold, bar graph displays the
peak modulation percentage. A reading of “100” coincides with 75 kHz deviation. The
display holds briefly (about 0.1 seconds) after the peak. The “Pilot” indicator illuminates
when the transmitter is in the stereo mode. To verify the actual (or more precise)
modulation percentage, connect a certified modulation monitor to the RF monitor jack on
the rear panel.
Carrier Switch : This switch controls power to the RF amplifiers and supplies a logic
high to the voltage regulator board, which enables the supply for the RF driver. In
addition, the Carrier Switch controls the operating voltage needed by the switching power
regulator. A “Lock Fault” or a low pin 12 (/Carrier Off) on the Remote I/O connector will
hold the carrier off.
Main Power Switch : The main on/off power switch controls both the 120/240 VAC and
the DC battery power input.