Specifications

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WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
Platinum VAX-C Series
Figure 3-62 ATSC Modulator Status Screen (Page) 3
Figure 3-63 Xmtr Home>Exciter Home>Status>ATSC Modulator>Next>Next (screen 3)
Field Explanation
Network ID This is the Network ID entered at the distributed transmission adapter. In
the USA, is customary to use the assigned TSID for the station as the
network ID.
Lock Method ATSC's A/110 standard specified two methods to achieve timing
reference for SFN emission, they are GPS and stream locked.
In the stream locked mode, the exciter extracts it's timing from the 19.39
MHz clock embedded in the transport stream.
The exciter section only supports GPS locked mode. This mode is set by
the distributed transmission adapter. If another manufacturer's adapter is
being used and it has been set up for stream locked mode, the M2X will
not lock and a fault will be indicated.
Watermark Serial Data
Inhibited
RF Watermark is a slow speed serial data stream that can be modulated
onto each of the 8 symbol levels emitted. This enables use of specialized
test equipment in the field to figure out which transmitters are being
received in an SFN environment.
In addition to transmitter identification, the RF Watermark can be used as
a slow-speed serial communication channel. The M2X does not currently
support this channel, but the DTxA has the ability, in compliance with the
standard, to tell a downstream modulator to inhibit the modulation of this
data on the watermark or not. This is a read back of the setting of that bit
in the DTxP.