VT30/OM Rev-A
9
4.2.3 Video Inversion Switch:
All AMP Transmitters and Receivers are standard equipped with video inversion,
selectable with a slide switch accessible through the chassis lid. When selected, the
phase of the video signal is inverted (shifted 180
o
) in the transmitter and re-inverted in
the receiver, providing a basic level of security. If an inverted video signal is detected by
a receiver not configured for inversion, the resulting picture is scrambled.
To select standard video (no inversion), position the slide switch to VIDEO STD as
indicated on the unit label. To select inverted video (phase inversion), position the slide
switch to VIDEO INV as indicated on the unit label.
The video inversion switch position on AMP’s Receivers must match that of the
transmitter or the picture will appear scrambled. If using AMP’s Transmitters with other
receivers or vice-versa, position the Video Inversion slide switch to VIDEO STD.
4.2.4 Audio On/Off Switch(es):
VT30 Series Transmitters are standard equipped with one audio subcarrier. A second
audio subcarrier is optional. Each subcarrier is individually enabled / disabled with a
slide switch accessible through the chassis lid. When enabled, the audio signal applied to
the audio input is transmitted. When disabled, the subcarrier signal is not produced, and
no audio is transmitted.
To enable audio transmission, position the corresponding slide switch to AUDIO ON as
indicated on the unit label. To disable audio transmission, position the corresponding
slide switch to AUDIO OFF as indicated on the unit label.
When two subcarriers are specified, Audio On/Off switches are designated as AUDIO-1
ON / AUDIO-1 OFF and AUDIO-2 ON / AUDIO-2 OFF on the unit label.
4.2.5 Line / Mic Audio Level Switch(es):
VT30 Series Transmitters accept either Line or Microphone Level audio inputs. Audio
level for each subcarrier is individually controlled with a slide switch accessible through
the chassis lid. When set to Line, the audio input circuitry adjusts to accept standard Line
Level (-10 dBV) audio. When set to Mic, the audio input circuitry adjusts to accept
typical Microphone Levels (-70 thru -20 dBm) with automatic level control (ALC).
To adjust the audio input to Microphone Level for either subcarrier, position the
corresponding slide switch to MIC as indicated on the unit label. To adjust the audio
input to Line Level for either subcarrier, position the corresponding slide switch to LINE
as indicated on the unit label.
When two subcarriers are specified, Audio Level switches are designated as AUDIO-1
LINE / AUDIO-1 MIC and AUDIO-2 LINE / AUDIO-2 MIC on the unit label.
