Broadcast Electronics AM-2.5E, User Manual

Page: 63 / 320

3-14
3-21.
MONO/STEREO OPERATION.
3-22. To configure the transmitter for monophonic or stereophonic operation, perform the follow
ing procedures.
3-23.
STEREO OPERATION.
To configure the transmitter for stereo operations, depress the ex
citer mode control switch to illuminate the stereo indicator on the stereo circuit board. In
addition, the ECU front-panel stereo indicator will illuminate.
3-24.
MONO OPERATION.
The transmitter can be configured to the monophonic mode by:
1) manually selecting the desired mono mode using the stereo circuit board or 2) automati
cally configuring the transmitter by removing the stereo circuit board. To configure the
transmitter for mono operations, proceed as follows:
3-25. Mono Operation - Stereo Circuit Board. To configure the transmitter for mono operation
using the stereo circuit board, depress the exciter mode control switch to illuminate the
mono L+R, mono left, or mono right indicators on the stereo circuit board. In addition, the
ECU front-panel MONO indicator will illuminate.
3-26. Mono Operation - No Stereo Circuit Board. In the event of a stereo circuit board failure,
the transmitter will automatically configure to the monophonic mode when the stereo cir
cuit board is removed from the ECU. To remove the stereo circuit board and configure the
transmitter for monophonic operation, proceed as follows:
CAUTION
CAUTION
TO PREVENT DAMAGE TO THE TRANSMITTER, EN
SURE THE TRANSMITTER PRIMARY POWER IS OPER
ATED TO OFF BEFORE REMOVING THE STEREO CIR
CUIT BOARD.
1. Operate the transmitter primary power to off.
2. Completely remove the stereo circuit board from the ECU. Do not leave the circuit
board in the ECU chassis.
3. Refer to Figure 2-5 in SECTION II, INSTALLATION and ensure the monophonic
audio channel select jumper is configured for the desired audio channel.
4. If required, adjust the single channel level by referring to SECTION II,
INSTALLATION and performing the SINGLE CHANNEL LEVEL procedure.
3-27.
PILOT CONTROL.
3-28. The pilot switch on the stereo circuit board controls the pilot tone. Operate the pilot switch
to on to enable the pilot tone. Operate the pilot switch to off to disable the pilot tone.
3-29.
EXCITER MONITOR OPERATION.
3-30. The following text presents procedures for specific exciter monitoring functions. Perform
the appropriate procedure for the type of monitor function desired.
3-31.
MONO/STEREO INDICATIONS.
The MONO and STEREO indicators display the oper
ating mode of the exciter. The MONO indicator will illuminate to indicate when the excit
er is configured for mono L+R, mono left, or mono right operation. The STEREO indicator
will illuminate to indicate when the exciter is configured for stereo operation.
3-32.
INPUT SELECTION.
Depress the L/R/L+R/L-R MODE switch/indicator to: 1) illuminate
the L/R indicator to select left and right channel information or 2) illuminate the L+R/L-R
indicator to select L+R and L-R information. The selected parameter will appear on the
EXCITER MONITOR display.