The KTech VSB-ENC-150E is an 8-VSB Modulator. This unit accepts either SMPTE-310M or DVB-ASI signals as its input, modulates the input into an 8-VSB 44.0 MHz I.F. signal, then outputs a RF 8-VSB signal between the frequency range of 55 to 858 MHz.
Baseband Processing includes Null Packet Insertion and Removal, PCR Correction and PSIP Modification. The first step in this process is Null Packet Insertion and Removal. Note: Baseband Processing only occurs for DVB-ASI Inputs less than or equal to 45 Mbps. If SMPTE-310M output is desired, the DVB-ASI Input should not exceed 19 Mbps.
An 8-VSB Modulator modulates the Parallel MPEG2 Transport Stream into an 8-VSB 44.0 MHz I.F. signal in accordance with the ATSC AC3 Document.
The Upconverter takes a 44.0 MHz I.F. signal and converts it to a higher frequency. Its RF output is frequency agile in 12.5 KHz steps over a range of 55 MHz to 858 MHz. These frequencies cover both CATV and VHF/UHF bands. PCR Correction The Program Clock Reference (PCR), embedded within the transport stream, is used to synchronize a receiver's clock with an encoder's clock. The original PCR values that were stamped into the stream by the original encoder will not be the correct PCR values for the receiver after Null Packets are inserted into or removed from the stream. As a result, PCR values need to be re stamped so that the receiver will have the correct PCR values, avoiding PCR clock jitter at the receiver's end.
PSIP VCT's Station ID and Major and Minor Channel Numbers are modified within the stream.
All settings and controls can be viewed and set using a web-based GUI or Front Panel Control.