On Tue, 12 Nov 2002 monty_v@xxxxx wrote: > Hello, > > I posted these questions about six months ago and nobody seamed to know > the answers. I was hoping if I were to repost my questions that hopefully > someone might be able to help? > > > I own a Hauppauge Wintv #401-DBX_stereo (NTSC) card. This card has a > MSP3430G audio chip on-board. I am wondering if the card itself is > capable of receiving/demodulating the Second Audio Program signal using > a subcarrier signal on some channels? > > I have been trying to locate specs on SAP like: What frequencies does it > use, what kind of modulation does it use etc... A short but complete summary is at http://www.wa2fnq.hamradios.com/btscdoc.htm In short, SAP is a frequency-modulated subcarrier centered at 78.670 Khz, which is 5 times the video's horizontal line frequency. It is combined with the rest of the audio carriers, and transmitted at 4.5Mhz above the video carrier.
