Specifications

3-94 888-2857-001 5/9/13
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
Platinum VAX-C Series
Offset Delay Time offset for emission contained in the Distributed Transmission Packet for this
particular transmitter.
Delay Adjust This is a dynamic indication of the amount of delay adjustment the modulator is
computing. Nominally this should be zero. It often moves plus or minus 100 nS for
minor adjustments. Important that it is relatively stable, not wildly fluctuating.
TAD Transmitter to antenna delay. This the throughput delay, measured after the signal
leaves the exciter network delay circuit and travels to the output of the transmitter.
This delay is important if the network consists of transmitters from different
manufactures, where the output process time will change from one manufacturer to
another.
Total Delay This is the resultant total delay being managed by the timing requirements to meet
the emission time, including TAD.
# of Dly Inc Number of delay increments that the modulator has had to perform to maintain
emission timing. High or continual incrementing numbers here indicate instability
in the network's distribution of the transport stream or timing. Ideally this is zero.
# of Dly Dec Number of delay decrements that the modulator has had to perform to maintain
emission timing. High or continual incrementing numbers here indicate instability
in the network's distribution of the transport stream or timing. Ideally this is zero.
Reset Count Soft Key Pressing this soft key resets the above two counts to zero.
Softkeys
Status Displays Status screen.
Exciter Home Displays Exciter Home screen.
Figure 3-61 Xmtr Home>Exciter Home>Status>ATSC Modulator>Next (screen 2)
Field Explanation