> > Will OGC be able to output arbitrary waveforms, or only video? > > If OGC can generate sine waves, square waves, triangle, etc. > > it would be very useful as a piece of test equipment. It > > could be a tracking generator for the spectrum analyzer? > > I thought it would be interesting to generate RF signals entirely in > the digital domain and use a video DAC to turn it into analog. For > instance, you can have a sine-wave generator, that's completely > digital, and it has parameters that you can use to adjust the > frequency, within a band. BOOM. You have an FM transmitter. Attach > an amplifier, and you can send audio to a nearby radio.
I forgot to mention this, but I recall reading that someone did this using a video card. I don't recall if it was AM or FM. > If the granularity of our control of the signal is 330Mhz, Ouch, that's a bit of a limitation. I don't suppose the two heads could be interlaced together somehow to get 660 Mhz? (Still low, but better than 330.) And we lose half of that to Nyquest? > can we > encode all of the information in the TV signal? Would the steps > between digital levels (1024 of them) be too noisy? Could we fix that > with a low-pass filter? Does 1024 levels imply a S/N of 30.103 dB? If so, that would be plenty for ATSC, but IIRC a bit low for good quality NTSC. I haven't seen numbers for PAL, SECAM, or DVB-T. _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
