Olson Technology OTM-4000 - Manual (Page 6)

025-000331 REV B Page 6
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 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 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
HOST IN
This RJ connector is only present when the optional remote control module is installed and it is the
remote control input for the modulator.
NEXT OUT
This RJ connector is only present when the optional remote control module is installed and it is used
to connect a “next” modulator in a site with a group of remotely-controlled OTM-4000’s.
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
connector. The OTM-4000 is shipped from the factory with this jumper in place.