In the dozens of spec sheets and app notes that I've read, I've never seen a separate RF/IF Tuner Module just for NTSC. They all show a common RF/IF Tuner. <holl_ands> =================================================== Mark Aitken <maitken@xxxxxxxxxx> wrote: Because of the close integration of the demod chip with the tuner, more than likely there is a second NTSC tuner circuit, which would require a RF split... Richard Hollandsworth wrote: >I don't see how adding an NTSC/BTSC decoder chip affects the Noise Figure. >The output of the IF Amplfier strip would presumably be split to feed both the >ATSC/QAM Decoder chip and the NTSC/BTSC decoder chip. Since the IF Splitter >loss would be at the end of the IF Amplifier chain, the reduction in overall >Noise Figure would be much, much less than a dB. >Of course if the NTSC/BTSC decoder function were built into the ATSC/QAM >Decoder chip, using a common A/D Converter, there would be no need for an IF >Splitter, >for example the Broadcom BCM3520 ATSC/QAM/NTSC/BTSC Decoder chip and BCM3560 >DTV SYSTEM-ON-CHIP. > --------------------------------- Do you Yahoo!? With a free 1 GB, there's more in store with Yahoo! Mail. ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.