On Mar 26, 1:14�pm, "mpd" wrote:
I don't see how it can signficantly block other stations. If the range
of it low as some have claimed then whats the difference from day?
As of yet the three AM ones I can get in HD haven't moved to hd at
night...now two of them are a bit out of range sometimes but one of
them is a 50kw so I guess they are deciding not to. In some reguards
it's a bit redundant because the power is such that probably a quarter
of the country could probably receive it
FM hd makes sense although I think AM definatly needs work. There's
things the IBOC can do to calm some people down...like what? how about
these for starters
1) giving a huge discount if not free transmitters for hd to college
radio, religious and non profit
2) We've seen similar content grouped with subchannels...why not the
opposite? Radio is known for some talk that definatly bends a bit to
the right...why not say attach air america as a subchannel on
something with rush?
3) *sort of combining #2 and #1 how about subchannels that act like
the community band (88-90mhz) since that can get crowded and fm
transmitters sometimes override it.
4) Making sure that local channels retain local news and events rather
than having simply interruptions for other events
First of all, go here to find out mo
http://www.radio-info.com/smf/index....ard,194.0.html
The problem is first and second adjacent-channel interference. HD/IBOC
on AM, takes up 20 - 30 khz on either side of the analog carrier (it
carries along digital sidebands). I have listened to AM-HD during the
day, and with an analog tuner, tuned to an HD-AM station from this
list:
http://www.ibiquity.com/hdradio_find_a_station
We have WTWP at 1500 HD-AM, and when I tune to 1510 and 1490 all I
hear is the sounds of rusing water - these are the digital sidebands.
Now, if there was an AM station at either 1490, or 1510, it would be
obliterated bty this digital hash. The concern, especially, is with
nighttime AM-HD, where these sidebands would be carried hundreds of
miles and interfer with local stations, or if you have a 50kw AM-HD
station locally, its digital sidebands would interfere with any
skywaves coming in from a distance. HD/IBOC has assured that fringe
listeners will be lost.