MP1-4166
Adjust the frequency from the VCT to ensure it is compatible with BDA tuners.
ATSC/SCTE physical channels are 6 MHz wide (ie. bandwidth = 6 MHz). The conventional reference is the centre frequency. So, if the channel is 500..506 MHz the conventional reference would be 503 MHz.
The BDA framework and BDA compatible ATSC tuner drivers do not use the centre frequency either. Due to historical factors and conventions the analog video carrier frequency (which is 1.75 MHz below the centre frequency) is used. In the previous example that would be 501.25 MHz.
The frequency carried in broadcast VCT is the centre frequency. This must be converted for compatiblity with BDA tuners.