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HD Radio
On Sep 11, 5:09?pm, wrote:
Your old radios will still work; the high-definition (HD) signal that's currently in use is compatible with good old-fashioned AM receivers. This is because the digital information is placed (in frequency) above and below the analog signal. There are couple of HD stations here in the Washington DC area, and on any AM receiver I've used so far, including my antique tube radios, this digital "hash" has not bleed through to the audio stages. When accurately tuned to an HD station, the voice and music sound just as it always has. The Ibiquity website has information on how this all works, and at one time, you could download a couple of conference papers describing how the HD signal is formatted. Go to the following link and start fishing around: http://www.ibiquity.com/hd_radio/hdr...w_does_it_work There's concern that HD signals cause interference because the digital information is placed in what are often referred to as "guard bands," essentially the blank space on the dial between local stations. Indeed, when you tune across an HD signal you hear hash, then clean audio, then hash again. Consequently, to date the FCC has only allowed HD signal to be broadcast during daytime when AM radio signals travel shorter distances. However, this restriction may have been lifted recently. Perhaps other posters can comment on this. Personally, I'm indifferent as whether HD radio is here to stay or ultimately proves to be a wash. If it does gain a foothold, and the public enthusiastically buys new receivers to hear it, then it could breathe new life back into AM radio, which has been moribund for years. Right now, I'm not inclined to cough up $200 for a new AM radio, but if the price were a third of that, I might be interested. Finally, if HD radio becomes a permanent presence on the AM band, I imagine it will be decades before a completely digital version is adopted, if at all. AM broadcasting has been with us since 1922 and there are millions of analog-only receivers out there. I therefore imagine broadcasters much favor the current backward-compatible HD format, because adopting it won't mean shutting out entire audiences. -Dave Drumheller Did you notice that WTWP has had their IBUZZ exciter off for days ? Now, I can hear WTRI without buzzing again ! |
HD Radio
On Sep 11, 6:57 pm, IBOCcrock wrote:
Did you notice that WTWP has had their IBUZZ exciter off for days ? Now, I can hear WTRI without buzzing again ! Yeah, I've heard the buzz on some of the DC stations, but thought is was probably due to some noise source local to my neighborhood. There's lots of stray noise on the AM band these days, so I simply ignored the buzz as best I could. If a station was (or stations were) responsible for this, shame on the engineers running the equipment. -Dave Drumheller |
HD Radio
On Sep 11, 8:45?pm, wrote:
On Sep 11, 6:57 pm, IBOCcrock wrote: Did you notice that WTWP has had their IBUZZ exciter off for days ? Now, I can hear WTRI without buzzing again ! Yeah, I've heard the buzz on some of the DC stations, but thought is was probably due to some noise source local to my neighborhood. There's lots of stray noise on the AM band these days, so I simply ignored the buzz as best I could. If a station was (or stations were) responsible for this, shame on the engineers running the equipment. -Dave Drumheller The IBUZZ is from 630 and 980 AM. - tune 10 and 20Khz away from the main channels, to see what I mean... |
HD Radio
On Sep 11, 5:45 pm, wrote:
On Sep 11, 6:57 pm, IBOCcrock wrote: Did you notice that WTWP has had their IBUZZ exciter off for days ? Now, I can hear WTRI without buzzing again ! Yeah, I've heard the buzz on some of the DC stations, but thought is was probably due to some noise source local to my neighborhood. There's lots of stray noise on the AM band these days, so I simply ignored the buzz as best I could. If a station was (or stations were) responsible for this, shame on the engineers running the equipment. -Dave Drumheller DD - The Engineers are doing the best that they can with the IBOC Transmission Scheme; which uses reduced Analog Bandwidth and Extended Digital Side Bands. It is the IBOC Technology that is the Problem especially when you are using an Analog AM/MW Radio to listen to and Analog Signal coming from an "HD" {IBOC} AM/MW Radio Station that also has an "HD" {IBOC} AM/MW Radio Station on both Adjacent Channels : one 10 kHz above; and one 10 kHz below. You will notice the Digital Hash. When this happens and it will for many AM/MW Radio Listeners in the future. Your 'choices' are : 1 - Tune to a different AM/MW Radio Station 2 - Change to FM Radio Listening. 3 - Buy an "HD" {IBOC} Radio and then Listen to your Favorite AM/MW Radio Station in "HD". The AM/MW Radio Stations using the IBOC Technology 'hope' that you will do # 3. FWIW - A couple of the posts that I have read else where have basically said that when the Poster had the Digial Hash problem with their favorite AM/MW Radio Station; and went out and bought a "HD" Radio; the "HD" Radio reception was as good as and usually better sounding than the 'old' Analog AM/MW Radio Station prior to IBOC. - - - Sounds like back to Square-One at a higher cost. For the common {average} AM/MW Radio Listener : at Home; in their Car; or at Work in an Office. Who lives in an Urban Area with good Signal Levels : IBOC as a Mass Media Technology may provide a better Radio Listening Experience. But for those AM/MW Radio Listeners in the Suburbs and Rural Areas with limited Listening Choices and weak Signal Levels : IBOC as a Mass Media Technology may prove to be a Radio Listening Experience they find lacking. FM "HD" Radio and the FM Radio Band Plan are a different matter. For the common {average} FM Radio Listener : IBOC and "HD" FM Radio should provide them a better Radio Listening Experience in all areas : Urban; Suburban and Rural as IBOC is fully adopted and the HD Signal Level is increased to fill-in the Gaps of the Digital Broadcast Signal Coverage. that's my assessment ~ RHF |
HD Radio
RHF wrote:
On Sep 11, 5:45 pm, wrote: On Sep 11, 6:57 pm, IBOCcrock wrote: Did you notice that WTWP has had their IBUZZ exciter off for days ? Now, I can hear WTRI without buzzing again ! Yeah, I've heard the buzz on some of the DC stations, but thought is was probably due to some noise source local to my neighborhood. There's lots of stray noise on the AM band these days, so I simply ignored the buzz as best I could. If a station was (or stations were) responsible for this, shame on the engineers running the equipment. -Dave Drumheller DD - The Engineers are doing the best that they can with the IBOC Transmission Scheme; which uses reduced Analog Bandwidth and Extended Digital Side Bands. It is the IBOC Technology that is the Problem especially when you are using an Analog AM/MW Radio to listen to and Analog Signal coming from an "HD" {IBOC} AM/MW Radio Station that also has an "HD" {IBOC} AM/MW Radio Station on both Adjacent Channels : one 10 kHz above; and one 10 kHz below. You will notice the Digital Hash. When this happens and it will for many AM/MW Radio Listeners in the future. Your 'choices' are : 1 - Tune to a different AM/MW Radio Station 2 - Change to FM Radio Listening. 3 - Buy an "HD" {IBOC} Radio and then Listen to your Favorite AM/MW Radio Station in "HD". The AM/MW Radio Stations using the IBOC Technology 'hope' that you will do # 3. FWIW - A couple of the posts that I have read else where have basically said that when the Poster had the Digial Hash problem with their favorite AM/MW Radio Station; and went out and bought a "HD" Radio; the "HD" Radio reception was as good as and usually better sounding than the 'old' Analog AM/MW Radio Station prior to IBOC. - - - Sounds like back to Square-One at a higher cost. For the common {average} AM/MW Radio Listener : at Home; in their Car; or at Work in an Office. Who lives in an Urban Area with good Signal Levels : IBOC as a Mass Media Technology may provide a better Radio Listening Experience. But for those AM/MW Radio Listeners in the Suburbs and Rural Areas with limited Listening Choices and weak Signal Levels : IBOC as a Mass Media Technology may prove to be a Radio Listening Experience they find lacking. FM "HD" Radio and the FM Radio Band Plan are a different matter. For the common {average} FM Radio Listener : IBOC and "HD" FM Radio should provide them a better Radio Listening Experience in all areas : Urban; Suburban and Rural as IBOC is fully adopted and the HD Signal Level is increased to fill-in the Gaps of the Digital Broadcast Signal Coverage. that's my assessment ~ RHF . RHF: HD radio is going to have to do much better than present to get me to listen to it. As I told Eduardo I went to the local Radio Shack for a demo, and receiver couldn't decode it. That was the Rhapsody $100 set. The stations were the local 1kw stations (1400 and 1450 KHZ) and all that was shown is the blinking Blue light. The transmitters are localed about 5 and 10 miles from the Radio Shack location. Now I regularly decode the Radio New Zealand DRM signal with few drop outs using my TEN TEC 320D, as well as the Sackville relay in CANADA which includes Radio Netherlands, Canada, Vatican radio, and TPD Radio which is sent out in 20KHZ stereo! This is at my QTH in Tucson using my home made 25 foot inverted vee. However, DXing from 5 miles away is not a good sign. Plus there are no truly portable HD radios for sale yet. I do most of my listening while hiking or biking. I use a Sony radio to also receive sw while on the go also. I won't be tether to my home or car for local radio. I go to satellite radio first. I have stopped regularly listening 1400 and 1450 because in analog there signal sound terrible due to the 5kHz bandwidth. It reminds me of listening to the telephone music while you are put on hold. In my car (JEEP) I have a Infinity Gold AM stereo and FM stereo and the 1400 station used to sound great in AM stereo, but since they switched to HD I can here the HASH and reduced sound, and have stopped listening. I can't tell any difference on the FM, but I don't have to DX FM to receive it. Ken I |
HD Radio
On Sep 12, 12:57 am, RHF wrote:
On Sep 11, 5:45 pm, wrote: On Sep 11, 6:57 pm, IBOCcrock wrote: Did you notice that WTWP has had their IBUZZ exciter off for days ? Now, I can hear WTRI without buzzing again ! Yeah, I've heard the buzz on some of the DC stations, but thought is was probably due to some noise source local to my neighborhood. There's lots of stray noise on the AM band these days, so I simply ignored the buzz as best I could. If a station was (or stations were) responsible for this, shame on the engineers running the equipment. -Dave Drumheller DD - The Engineers are doing the best that they can with the IBOC Transmission Scheme; which uses reduced Analog Bandwidth and Extended Digital Side Bands. It is the IBOC Technology that is the Problem especially when you are using an Analog AM/MW Radio to listen to and Analog Signal coming from an "HD" {IBOC} AM/MW Radio Station that also has an "HD" {IBOC} AM/MW Radio Station on both Adjacent Channels : one 10 kHz above; and one 10 kHz below. You will notice the Digital Hash. When this happens and it will for many AM/MW Radio Listeners in the future. Your 'choices' are : 1 - Tune to a different AM/MW Radio Station 2 - Change to FM Radio Listening. 3 - Buy an "HD" {IBOC} Radio and then Listen to your Favorite AM/MW Radio Station in "HD". The AM/MW Radio Stations using the IBOC Technology 'hope' that you will do # 3. FWIW - A couple of the posts that I have read else where have basically said that when the Poster had the Digial Hash problem with their favorite AM/MW Radio Station; and went out and bought a "HD" Radio; the "HD" Radio reception was as good as and usually better sounding than the 'old' Analog AM/MW Radio Station prior to IBOC. - - - Sounds like back to Square-One at a higher cost. For the common {average} AM/MW Radio Listener : at Home; in their Car; or at Work in an Office. Who lives in an Urban Area with good Signal Levels : IBOC as a Mass Media Technology may provide a better Radio Listening Experience. But for those AM/MW Radio Listeners in the Suburbs and Rural Areas with limited Listening Choices and weak Signal Levels : IBOC as a Mass Media Technology may prove to be a Radio Listening Experience they find lacking. FM "HD" Radio and the FM Radio Band Plan are a different matter. For the common {average} FM Radio Listener : IBOC and "HD" FM Radio should provide them a better Radio Listening Experience in all areas : Urban; Suburban and Rural as IBOC is fully adopted and the HD Signal Level is increased to fill-in the Gaps of the Digital Broadcast Signal Coverage. that's my assessment ~ RHF . Too bad, RHF - Klsham is not buying into the HD Radio farce, despite your pathetic plees: http://hdradiofarce.blogspot.com/ |
HD Radio
On Sep 12, 12:57 am, RHF wrote:
On Sep 11, 5:45 pm, wrote: On Sep 11, 6:57 pm, IBOCcrock wrote: Did you notice that WTWP has had their IBUZZ exciter off for days ? Now, I can hear WTRI without buzzing again ! Yeah, I've heard the buzz on some of the DC stations, but thought is was probably due to some noise source local to my neighborhood. There's lots of stray noise on the AM band these days, so I simply ignored the buzz as best I could. If a station was (or stations were) responsible for this, shame on the engineers running the equipment. -Dave Drumheller DD - The Engineers are doing the best that they can with the IBOC Transmission Scheme; which uses reduced Analog Bandwidth and Extended Digital Side Bands. It is the IBOC Technology that is the Problem especially when you are using an Analog AM/MW Radio to listen to and Analog Signal coming from an "HD" {IBOC} AM/MW Radio Station that also has an "HD" {IBOC} AM/MW Radio Station on both Adjacent Channels : one 10 kHz above; and one 10 kHz below. You will notice the Digital Hash. When this happens and it will for many AM/MW Radio Listeners in the future. Your 'choices' are : 1 - Tune to a different AM/MW Radio Station 2 - Change to FM Radio Listening. 3 - Buy an "HD" {IBOC} Radio and then Listen to your Favorite AM/MW Radio Station in "HD". The AM/MW Radio Stations using the IBOC Technology 'hope' that you will do # 3. FWIW - A couple of the posts that I have read else where have basically said that when the Poster had the Digial Hash problem with their favorite AM/MW Radio Station; and went out and bought a "HD" Radio; the "HD" Radio reception was as good as and usually better sounding than the 'old' Analog AM/MW Radio Station prior to IBOC. - - - Sounds like back to Square-One at a higher cost. For the common {average} AM/MW Radio Listener : at Home; in their Car; or at Work in an Office. Who lives in an Urban Area with good Signal Levels : IBOC as a Mass Media Technology may provide a better Radio Listening Experience. But for those AM/MW Radio Listeners in the Suburbs and Rural Areas with limited Listening Choices and weak Signal Levels : IBOC as a Mass Media Technology may prove to be a Radio Listening Experience they find lacking. FM "HD" Radio and the FM Radio Band Plan are a different matter. For the common {average} FM Radio Listener : IBOC and "HD" FM Radio should provide them a better Radio Listening Experience in all areas : Urban; Suburban and Rural as IBOC is fully adopted and the HD Signal Level is increased to fill-in the Gaps of the Digital Broadcast Signal Coverage. that's my assessment ~ RHF . "When this happens and it will for many AM/MW Radio Listeners in the future" Won't last for long - AM-HD is DOA: http://hdradiofarce.blogspot.com/ |
HD Radio
David wrote: On Tue, 11 Sep 2007 14:09:05 -0700, wrote: Your old radios will still work; the high-definition (HD) signal that's currently in use is compatible with good old-fashioned AM receivers. This is because the digital information is placed (in frequency) above and below the analog signal. There are couple of HD stations here in the Washington DC area, and on any AM receiver I've used so far, including my antique tube radios, this digital "hash" has not bleed through to the audio stages. When accurately tuned to an HD station, the voice and music sound just as it always has. That's total BS. All the highs are gone. I seem to have noticed that to some extent on WLS 890 out of Chicago. Perhaps Mr. Maus, who is closer in can give us his experience with that. |
HD Radio
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HD Radio
On Sep 12, 8:54 am, dxAce wrote:
I seem to have noticed that to some extent on WLS 890 out of Chicago. Perhaps Mr. Maus, who is closer in can give us his experience with that. That's most likely because you're trying to squeese "hi-fi" into +/- 5 khz worth of bandwith. It's why your audio's going to sound like a crunched up Real-Audio stream. http://www.nrscstandards.org/DRB/Non...tal_Report.pdf Stephanie Weil New York City, USA |
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