VT15/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 (250 mW Models Only):
VT15 Series Transmitters with 250 mW RF output may be equipped with one Line / Mic
selectable audio subcarrier or two Line-Only subcarriers. An Audio On/Off slide switch,
accessible through the chassis lid, is provided only when two Line-Only subcarriers are
specified and enables / disables both subcarriers together. When enabled, the audio
signal(s) applied to the audio input(s) is transmitted. When disabled, the subcarrier
signal(s) 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.
4.2.5 Line / Mic Audio Level Switch (250 mW Models Only):
VT15 Series Transmitters with a single audio subcarrier accept either Line or
Microphone Level audio inputs controlled by 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, position the slide switch to MIC as
indicated on the unit label. To adjust the audio input to Line Level, position the slide
switch to LINE as indicated on the unit label.
