Larcan Inc DTT250M Manuale Utente
GENERAL
DESCRIPTION
TSM 20-275D rev 0: Jul 1, 2010
2
DTT250M
DTT250M
– 250W Digital Television Transmitter
TRANSMITTER CONTROL
The control circuitry in this solid state transmitter is simple. Interlocking consists of the enabling
circuitry necessary to ensure that any external patch panel link operation, or RF switching, can only be
done with RF turned off.
nable J5‐5.
All control wiring of the transmitter passes through a control circuit board (prefix 5B), and facilities are
provided on this board for telemetry, status, and control connections to and from a remote control
system. These are available on 15 contact D‐shell connector J5.
For local operation, simply place the LOC‐REM switch in the LOC position. For remote control
operation the LOC‐REM switch must be in the REM position. This places +12V on Remote E
The Remote Enable +12V appears as an arming signal at J5‐5, and the momentary connection of this
+12V to J5‐13 turns the transmitter ON, and momentary connection of the +12V to J5‐8 turns the
transmitter OFF.
The transmitter control and interlock wiring is also brought out on J3, which is provided with a terminal
block style of connector interface. Remote Enable, Remote On, Remote Off, and External Interlocks 1
and 2 are all brought out on J3 for connection as required.
A thermostat is provided in the PA heatsink to open the interlock chain should an unlikely overheating
condition occur.