Olson Technology OTM-4000 (PAL I) - Manual (Page 9)

025-000336 X2 Page 9
AUX IF
This LED, when on, indicates that the current IF source is the AUX input at the rear panel.
LCD DISPLAY PANEL
This displays menu and status information.
OUTPUT RF LEVEL
This control is used to set the RF output level. If the OTM-4000 I is feeding a system or network
with many channels, it is suggested that it be operated at an output level of +55dBmV minimum to
prevent degradation of the C/N ratio of that channel. If lower output levels are required, place an
in-line attenuator at the RF output.
Note that the OTM-4000 I may be capable of output levels greater than +60dBmV on some
channels. The specifications for spurious performance, etc are based on a maximum operating level
of +60dBmV. This unit may not meet it’s full specification if operated at greater that +60dBmV out.
RF ON
This LED indicates the output RF status.
5.) REAR PANEL CONNECTIONS
RF TEST
This output is approximately 20dB below the main RF output and may be used for monitoring or
test.
RF OUT
This is the main RF output connector.
REMOTE LOOP-THRU
These RJ connectors are only present when the optional remote control module is installed and it is
the remote control loop-thru for the modulator.
AUX IN
This is the AUX IF input. This input is before the SAW IF section and normally expects an IF input
level of +38 dBmV. It has AGC which will allow levels to vary as much as
± 5dB while holding the
RF output level constant.
This input may be enabled by shorting the AUX SELECT terminals on the rear panel, by front panel
control, by loss of video, or by (optional) remote control.
VIDEO IF IN
This is the video IF input to the SAW filter / output converter section. The AUX IF switch is AF-
TER this input. The video IF level at this point should be +38 dBmV.
In normally-configured applications this input is usually connected to the VIDEO IF OUT connec-
tor. The OTM-4000 I is shipped from the factory with this jumper in place.