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See Illustration 6–9 and accompanying schematic for the socket pin-out. 7 Display Circuit Board The front-panel LEDs, the numeric display, the slide switches, and the processing and RF level controls are mounted on the display circuit board. To access the component side of the board, remove the front panel by removing 12 screws. The board contains circuits for the digital panel meter, modulation peak detector, and LED display drivers, as well as indicators and switches mentioned above. Illustration 6–10 and accompanying schematic complement this discussion.
If the audio source is already processed, and further processing is not desired, use the Normal mode instead of Bypass and turn the Processing control on the front panel to “0”. If it is necessary to provide resistive terminations at the audio inputs (either lineto-line or line-to-ground), you may place resistors directly into the 8–pin DIP socket, A501, located between the XLR input connectors. See Illustration 6–9 and accompanying schematic for the socket pin-out. 7 Display Circuit Board The front-panel LEDs, the numeric display, the slide switches, and the processing and RF level controls are mounted on the display circuit board.
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. 4 Input Gain Switches The “+6 dB” and “+12 dB” slide switches set audio input sensitivity according to the following table. Nominal Input Sensitivity +10 dBm +4 dBm -2 dBm -8 dBm Switches +6 dB +12 dB Down Down Up Down Down Up Up Up Table 3–1 Input Gain Switches Find, experimentally, the combination of Input Gain switch settings that will bring the Wideband gain-reduction indicator to mid scale for “normal” level program material.