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IN3218HR OPERATION MANUAL - REV. 1.0 01/04/01
©2000 - INLINE, INC.
Operation
The IN3218HR is designed to distribute / extend video signals. The unit features gain and peaking controls
which can compensate for signal loss (associated with long cable runs), extending a video signal as far as 800
feet with minimum degradation. Actual drive distance depends on the resolution of the signal and the quality
of the cable used. Typically, low-resolution video signals (15KHz) can be sent 600-800 feet, and high-
resolution signals (30 KHz and above) can be sent 200-400 feet.
NORMAL MODE / SPLIT MODE OPERATION
The IN3218HR can function in two different amplification modes (normal mode or split mode) as described
below:
Normal Mode (factory default): The unit operates as a single amplifier (the input signal drives all eight
outputs). The second connector adjacent to the input may be used as a loop output if the internal jumpers are
set properly.
Split Mode: The unit operates as two independent amplifiers (each input drives four outputs). In split mode
operation, the IN3218HR can be used to amplify two separate composite video signals or to amplify a single
S-Video signal, with the Y (luminance) signal connected to one input connector and the C (chrominance)
signal connected to the second input connector.
Please note that in split mode there is no loop output connector since the Loop Out / Input 2 Connector is used
as an input. However, if a loop output is required, the inputs can be set to High Z termination using the
internal jumpers, and an IN9003 BNC "T" connector can be used to split the signal at the input.
LOOP OUTPUT CONNECTOR
The loop output connector provides a passive loop-through signal. This can be looped through to additional
amplifiers to create a larger DA system or to drive a local monitor. In order to use the loop output, the input
termination jumper (internal) must be set to High Z (unterminated). Instructions for changing the input
termination jumper are on the following page.
GAIN AND PEAKING CONTROLS
The gain controls can be used to compensate for video signal voltage losses. Peaking may be used to re-boost
high-frequency components that have been attenuated by long cable runs. The peaking control employs an
equalization circuit, introducing an adjustable high frequency peak.
Gain Control: The gain control is used to increase / decrease the contrast of an image by adjusting the
amplitude of the video signal. The control has a range of 0.7 (30% decrease) to 1.4 (40% increase). The
factory default setting is 1.0 (unity gain). Using the IN9333 adjustment tool, gently turn the control clockwise
to increase the video gain, and counter-clockwise to decrease the gain.
Peaking Control: The peaking control enhances image detail and sharpness by boosting high frequencies.
Using the IN9333 adjustment tool, gently turn the control clockwise to increase the peaking, and counter-
clockwise to decrease the peaking.
