Re: Speaking of HD Radio...
> I do not think you can do three separate audio sources, as
> my understanding is that one of them is the digital version
> of the analog signal's audio... and the whole system was
> designed to have automatic fallback to analog if the digital
> has a drop out.
I am installing an HD importer in an existing HD radio system on Monday. We are starting out with one extra stereo program service, and can add up to three, but we will see how bad the companded audio sounds first before we decide how many extra program channels to add.
> I could not find anything about defeating the fallback
> feature at the iBiquity site, so am assuming that one HD
> channel must be the same content as the analog carrier.
The Kenwood Car radios can be set to receive analog only, HD only, SAC (multicast) only, or do an automatic fall back to analog as the HD signal falls apart. Which it does after being only slightly outside of the typical 70 dbu FM contour. The FCC R&O states that stations must do a simulcast of the analog broadcast on the main HD system, and the SAC (multicast system has no such requirement.
> Yes, the HD channel or channels can do texting and such...
> remember, RDS was not designed for texting; it was designed
> to automatically find the same station on multiple channels
> in accordance with the European model of being on dozens up
> to hundreds of frequencies with the same programming in a
> specific nation.
The RDS system can scroll mesages of any nature, and can be set to scroll many different mesages, streamed from a computer. That is the text feature of RDS. The new feature that is being used by many is creating dynamic messages on the ID portion of the RDS signal, which is what most car radios show when tuning into an RDS-equipped station. Some felt that it was a distraction for drivers, but it is common in Europe, and now fairly common here in the US.
What drives me crazy is the "feature" of the HD radios I have that disconnect the RDS when you install the HD tuner box. It's an either/or thing. I would rather have both.
So far, that is the way it is..