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Quote From Radio World Sept. 13 about HD Radio

The minimum seperation rules are MUCH less stringent below 92MHz.
Click to expand...

This is false. There is no such thing, it's all contour based, which is more accurate. Commercial rules (73.215) allow contour based method to be used, as long as, a "dummy" mileage reference point can be shown.

The noncomm band does have many more stations per channel but are generally are better protected within their primary service contour.

The mileage separation table does not account for terrain, or the fact that many short spacings have occurred due to grandfathering and mutual upgrades.

The FCC's vitamin table has created a mess!
 
audiophile. said:
The minimum seperation rules are MUCH less stringent below 92MHz.
Click to expand...

This is false. There is no such thing, it's all contour based, which is more accurate. Commercial rules (73.215) allow contour based method to be used, as long as, a "dummy" mileage reference point can be shown.

The noncomm band does have many more stations per channel but are generally are better protected within their primary service contour.

The mileage separation table does not account for terrain, or the fact that many short spacings have occurred due to grandfathering and mutual upgrades.

The FCC's vitamin table has created a mess!
Click to expand...

So I used "minimum separation" instead of "contour based" to describe the situation to non-techies...I think I got the proper point acreoss.

Geez...
 
The most powerful radio stations are usually concentrated in or near the large cities. HD digital radio will create jamming "hiss zones" in the suburban areas between the metropolitan areas, and jam local stations. The digital hissing channels will overlap, creating digital intermodulation havoc. IN METROPOLITAN AREAS VIRTUALLY ALL RADIO FREQUENCIES ARE ALREADY USED. THERE ARE NO EMPTY ADJACENT CHANNELS TO BROADCAST ADDITIONAL DIGITAL HISS NECESSARY FOR HD DIGITAL RADIO, WITHOUT INTERFERING WITH OTHER LICENSED STATIONS.
 
It is possible to do it. They could have all fit within +/- 100 kHz bandwidth at the expense of SCA's.

Likewise on AM, a system like Powerside could be used to put analog on one sideband and digital on the other.

I would have no opposition to such a system.

There are a few engineering challenges to these examples but they would be possible.

I guess it was just easier to dump the trash over on the other neighbor's side of the fence and call it justified. :mad:
 
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