Specifications

5/9/13 888-2857-001 3-51
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
Platinum VAX-C Series
Local Offset Delay This allows the transmitter operator to set a delay for the transmitter
locally. Its purpose is to cause the RF output to be delayed additionally by
the amount entered.
Local RF Delay This is the time delay caused by the transmitter’s high power filter and
transmission line as well the GPS delay caused by its cable length. Its
purpose is to cause the RF output to be released earlier by the amount
entered thereby nulling out the above mentioned RF delays.
IIP Renewal Flag
Cntr (counter)
Renewal Flag is a bit in the IIP packet which, on the transition from 1 to
0, indicates the information in the IIP packet is valid.
The renewal flag counter provides the operator with an indication that the
IIP information is being updated on a regular bases. Note that the Max
Delay and IIP Time Offset is only updated when the IIP Renewal Flag
changes from 1 to 0. On exciter power up, the modulator will wait for an
IIP renewal flag transition from 1 to 0, which indicates the IIP packet
data is valid.
IIP Time Offset The IIP Time Offset, in ms, allows the SFN Adapter upstream to send an
offset time to individual transmitters in the SFN network. This allows the
SFN network operator to change any of the transmitter delays in the SFN
from one central location, the SFN adapter.
IIP Max Delay This delay is sent from the SFN Adaptor to the modulator. It indicates the
time from the time stamp in the IIP packet to when the head of the
multiplexed frame is to be emitted.
Processing Delay Processing Delay, in ms, is the time required for the signal to propagate
thru the modulator during the modulation process. This time omits the
delay caused by the time interleaver.
Network Delay This time in ms is the time required for the transport stream to travel from
where the IIP packet is time stamped in the SFN adaptor until the packet
is received by the modulator.
SFN Storage Time Storage time, in ms is the Max Delay plus the local RF Delay, minus the
processing Delay, minus the Local Offset Delay, minus the IIP Offset
Delay, minus the Network Delay. SFN Storage Time is the delay buffer
incorporated in the modulator to provide the required delay for SFN
operation.
Softkeys
Setup Displays Setup screen.
Exciter Home Displays Exciter Home screen.
Table 3-26 Xmtr Home>Exciter Home>Setup>ISDB-T Modulator >Next
(screen 2)
Fields Explanation