Drake VM2860A Agile Modulator – 860 MHz - Manual (Page 5)

5 Front and Rear Panel Controls and Indicators
VM SERIES VIDEO MODULATOR
Opera Controls
All opera controls and indicators for the modulator are located on, or are accessible from the front panel.
[1] EAS/ALT INDICATOR: Lights Red when EAS/ALT is ac ve.
[2] VIDEO OVERMODULATION LED: Lights when modula
is above 87.5%.
[3] VIDEO MODULATION LEVEL: Adjusts percentage of modula .
[4] AURAL-TO-VISUAL CARRIER RATIO: Controls amplitude of aural RF carrier rela ve to visual RF carrier.
[5] AUDIO MODULATION LEVEL: Adjusts aural carrier modula
.
[6] AUDIO OVERMODULATION LED: Lights when peak devia of aural carrier is over 25 kHz.
[7] DISPLAY MODE BUTTON: Used to scroll through channel configura output level and modes.
[8] CHANNEL, CHANNEL CONFIGURATION/OUTPUT LEVEL DISPLAY
[9] UP/DOWN BUTTONS:
[10] ENTER BUTTON:
[11] STEREO INDICATOR:
Note: All c to the unit are made at the rear panel.
Figure 2 - Rear Panel (VM2860 Shown)
Figure 1 - Front Panel
[1] RF OUTPUT: + 60 dBmV
[2] IF INPUT: +35 dBmV IF Input
[3] EAS/ALT IF INPUT: Emergency Alert or Alternate IF Input
[4] IF OUT: +35 dBmV IF Output (See note #8 below)
[5] EAS/ALT IF TERMINAL:
[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 con
ty. The modulator will
not have an RF output without the IF loop installed.
[1]
[1] [2] [3]
[4]
[5]
[6]
[7]
[8]
[11]
[6] [5] [4] [3] [2]
[7] [8]
[9]
[10]
EAS/ ALT IF mode selection (see page 7)
Green LED lights when equipped with stereo (VM2862).
Used to scroll through the channel, channel configuration and output level modes.