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Is there a way that HD Radio could have more than 96kbps?
- Thread starter 97chris
- Start date
Yes. When FM goes all digital, I suspect there'll be about 300kbps.
Hmmm. Which will be around the same time as when pigs fly.
Haha. It could happen!
--- (i edited my post above to "300kbps" to be more clear)BTW Pigs can fly... on airplanes!!
It already does. The extended hybrid mode (which all current transmitters and receivers can support) adds four extra partitions to the digital sidebands and allows for 120 kbps total bitrate.
You're right, and we do use it at our station, but this extra bitrate can't be combined with the rest. In other words, you can't use the 24kpbs and any part of the original 96kpbs to create one higher bitrate channel. We use extended hybrid for a 24kpbs mono voice channel (HD4). There's a slightly lower coverage on the extended hybrid service because the extra partitions are closer to the station's center analog services. It's closer still in our case, because we also have a 67khz SCA analog channel as well.
We even have a Morse code service using frequency shift keying, oh my!
Ralph
KVCB-LP/HD
I was working out West on a project and discovered on an Audemat Golden Eagle back at the studio that the newly installed Nautel backup transmitter/exporter we were testing on the air was running in Extended Hybrid mode. Essentially extended mode widens the upper and lower digital sidebands closer to the analog portion of the carrier. Ralph is correct, that extra bandwidth isn't available for more bits in the HD-1 stream.
Something we noted when driving around in Extended Hybrid mode, was around reflective structures like overpasses and tall buildings closer to the site, the radio in the rental car was struggling more with reception of the analog portion of the signal. After changing the exporter settings to standard HD configuration, we re-drove that area and the analog signal was much better. Near as we could tell, the SDR tuner in the rental car was interpreting the closer-spaced digital carriers as noise, causing the tuner to mute or go into stereo blend mode.
Something we noted when driving around in Extended Hybrid mode, was around reflective structures like overpasses and tall buildings closer to the site, the radio in the rental car was struggling more with reception of the analog portion of the signal. After changing the exporter settings to standard HD configuration, we re-drove that area and the analog signal was much better. Near as we could tell, the SDR tuner in the rental car was interpreting the closer-spaced digital carriers as noise, causing the tuner to mute or go into stereo blend mode.
For us, we noticed that the analog signals, particularly the 67khz SCA, affected the MER readings for the extended Hybrid data carrier partition at 116khz to 122khz. It is still well into an acceptable level, but there is a slightly lower coverage for the HD4 channel assigned to this resource. Since the channel is a voice school and community announcement loop, it serves its purpose well.
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