The WQM-860SL is a professional quality, digital headend component providing QAM TS and RF upconversion functions in a single module.
The QAM modulator then applies cable environment FEC to the transport stream and remodulates using QAM modulation to an IF QAM signal.
In RF upconverter, the IF QAM signal is SAW filtered and then upconverted to the desired output channel. Any standard CATV output channel may be selected in the range of 54 to 860 MHz. Bandpass flatness and phase noise are closely controlled in the WQM860 to ensure a high MER output signal. This ensures that the Qam modulator will not introduce a source of errors into the distribution process. Because the MPEG2 transport stream information is not modified by the QAM modulator, all encryption, authorization, and program guide information are passed on to the CATV set top box, without any changes.