Installation And Operation; Installation; Interconnection - Standard Communications TVM Series Owner's Manual

4

INSTALLATION AND OPERATION

INSTALLATION

Remove the TVM modulator from its shipping container and inspect it for any
physical damage.
Install the modulator into position in a 19-inch rack panel. Support the modulator
while installing the four front panel mounting screws.
The unit weighs approximately 15 pounds (6.8 kilograms). It may be neces-
sary to have two people handle the modulator while the front panel mount-
ing screws are installed.
The nameplate on the rear of the modulator contains information concerning AC
power requirements. Make sure that the power receptacle is of the same voltage
before plugging in the AC power cord.
There is no AC power On/Off switch. The POWER indicator on the front panel of
the modulator will light when the power cord is plugged in. The CHANNEL
OUTPUT numeric light-emitting diode (LED) will display the channel number
stored in the nonvolatile read-only memory (ROM). Approximately four seconds
after power is applied, the RF OUTPUT LED will light. If the selected channel
has an assigned FCC offset frequency, the FCC OFFSET indicator will also light.
When installing more than one TVM modulator into an equipment rack,
always leave at least one rack unit between each of them for ventilation.

INTERCONNECTION

These modulators are designed for a headend environment. They accept separate
left- and right-channel audio (TVM450S and TVM550S or TVM550IIS), monaural
audio (TVM450, TVM550, or TVM550II), and composite video, via separate inputs.
Each modulator provides both visual and aural IF outputs to external equipment for
signal processing. The processed signals then return to the modulator's visual and
aural IF input jacks.
For local TV applications, each modulator receives on one TV broadcast channel
and modulates on another TV broadcast channel. Baseband or IF signals can
also be used.
Any TVM modulator can be used in a supertrunking environment. One modulator
installed at a remote antenna site drives several trunking lines.
TVM450/S/TVM550/S/TVM550II/TVM550IIS
NOTE
NOTE
Owner's Manual
Installation and Operation
Page 4-1