lynnh@tekfdi.FDI.TEK.COM (Lynn C. Hurd) (04/05/91)
Does anyone know the format of the digital audio (DATS) on Satcom F1R transponders 3,15 and 21? Can I build or buy an inexpensive decoder if I'm willing to throw away error correction or anything else to simplify it? Thanks, Lynn Hurd (503) 627-4643 W. (503) 649-9152 H. or reply via email.
stevewa@upvax.UUCP (Steve Ward) (04/07/91)
The demod units for digital audio on F1R cost about $10k each. The format used is very high density (on each transponder there are 20 15KHz bandwith channels or 40 7.5KHz channels) and without error correction you end up out of sync with the uplink and lose what channel you're decoding. I don't have the specifics any more, but I can probably find them out... PS, the current audio transponders on F1R are 3, 15, 23, and 9 (9 is the emergency backup transponder). Transponder 23 is used exclusively by ABC, 3 and 15 are split up among CBS, NBC/Mutual/Westwood One, Unistar, and more. In the next couple years, ABC and CBS will both co-exist on transponder 23, and will be using a new audio format which will use data compression to fit 3 20KHz channels in the space of 2 15KHz channels. Steve -- | Steve Ward Jr. appears courtesy of | stevewa@upvax.UUCP | | Univ. of Portland, Portland, OR | !tektronix!upvax!stevewa | | (insert disclaimer here) | upvax!stevewa@tektronix.TEK.COM | | --If all else fails, try: tektronix.TEK.COM!upvax!stevewa@uunet.uu.net |