5
Front and Rear Panel Controls and Indicators
Operating Controls
All operating controls and indicators for the modulator are located on, or are accesible from the front panel.
[1] EAS/ALT INDICATOR:
Lights Red when EAS/ALT is active.
[2] VIDEO OVERMODULATION LED:
Lights when modulation is above 87.5%
[3] VIDEO MODULATION LEVEL:
Adjusts percentage of modulation.
[4] AURAL-TO-VISUAL CARRIER RATIO:
Controls amplitude of aural RF carrier relative to visual RF carrier.
[5] AUDIO MODULATION LEVEL:
Adjusts aural carrier modulation.
[6] AUDIO OVERMODULATION LED:
Lights when peak deviation of aural carrier is over 25 kHz.
[7] DISPLAY MODE BUTTON:
Used to scroll through channel configuration, output level and modes.
[8] CHANNEL, CHANNEL CONFIGURATION/OUTPUT LEVEL DISPLAY
[9] UP/DOWN BUTTONS:
Used to scroll through the channel, channel configuration and output level modes.
[10] ENTER BUTTON:
Evokes the current settings in the channel/output display when depressed.
[11] STEREO INDICATOR:
Not Used
Note: All connections to the unit are made at the rear panel.
[1] RF OUTPUT:
+60dBmV
[2] IF INPUT:
+35 dBmV IF Input
[3] EAS/ALT IF INPUT:
Emergency Alert or Alternate IF Input
[4] IF OUT:
+35 dBmV IF Outpout (See note #8 below)
[5] EAS/ALT IF TERMINAL:
EAS/ALT IF mode selection (see page 7)
[6] AUDIO INPUT:
Audio input (standard)
[7] VIDEO INPUT:
1 Volt PP video input
[8] IF LOOP CABLE:
The IF loop cable (supplied) must be installed to provide RF continuity. The modulator will not have
an RF output without the IF loop installed.
[1] [6] [5] [4] [3] [2]
[7]
[8]
[9]
Figure 1 - Front Panel
[11]
[12]
[1]
[2]
[3]
[4]
[6]
[7]
[5]
Figure 2 - Rear Panel
[8]
