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#1
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Kiwa MW Air-Core Loop Antenna {In-the-News} FS / FA
IBOC is not authorized currently for night use. It is ok to turn it on
at sunrise and have it run til sunset, I believe. Sunrise and sunset are the two prime DX times on MW. The broadcasters want it at night I think - which mean the FCC will allow it eventually. They have to pretend to go through an evaluation/consideration period first. I can't see it succeeding on MW. Perhaps FM. I hope it does die a quick death on MW. |
#2
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Kiwa MW Air-Core Loop Antenna {In-the-News} FS / FA
wavetrapper wrote: IBOC is not authorized currently for night use. It is ok to turn it on at sunrise and have it run til sunset, I believe. Sunrise and sunset are the two prime DX times on MW. The broadcasters want it at night I think - which mean the FCC will allow it eventually. They have to pretend to go through an evaluation/consideration period first. I can't see it succeeding on MW. Perhaps FM. I hope it does die a quick death on MW. Just like DRM. DRM = QRM dxAce Michigan USA |
#3
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Kiwa MW Air-Core Loop Antenna {In-the-News} FS / FA
I actually have my Kiwa Air-Core Loop (bought years ago when they were
actually still being made) connected to my Yamaha RX-V4600 Home Theatre receiver which happens to be able to tune AM IBOC. It actually has a pretty good AM section. There are 3 local Detroit AM stations transmitting IBOC during the daylight hours. Two of them actually sound pretty good, the other one doesn't quite have their IBOC encoding working all that well and has lots of digital artifacts. The big problem, which kind of defeats the whole purpose is that, even with the help of the Kiwa Loop, AM IBOC cannot be received in "IBOC Mode" except for extremely strong local stations. Thus, even if I want to listen to "clear channel" digital stations at sunset or sunrise from other cities, the IBOC mode doesn't have enough digital signal to "latch on" to the digital broadcast. Thus, all the DX IBOC listener gets is a noisier, inferior AM DX signal, much worse sounding than it would have been without IBOC. I've tried tuning WBZ in Boston (an IBOC station) at sunrise, since they turn on their IBOC earlier than in Detroit (we're on the western edge of the Eastern Time Zone). They have an excellent analogue signal, but there's no hint of any detection of their IBOC signal. I also have DRM capabilities (a TenTec RX-350 receiver and computer sound card based software). As DXAce reports, the QRN from DRM transmissions to adjacent stations is JUST AS BAD OR WORSE than IBOC. However, since DRM doesn't share "bandwidth" with an analogue signal (as IBOC does), the sound quality of the received broadcasts are vastly superior -- truly FM table radio comparable. In addition, DRM is receivable over DX skywave conditions. I enjoy broadcasts from Radio Luxembourg in the early morning hours in true high fidelity stereo sound. DRM also allows vastly superior coverage with lower transmitter power. Listening to the late-afternoon DRM transmission of Radio Nederland from Bonaire with 5 kW, I get no dropouts and excellent audio quality. I doubt that shortwave broadcasting has much of a future, even with DRM. Antenna real-estate is just too expensive and environmental laws are stricter. However, those who complain about the QRN from DRM broadcasts should consider that all forms of digital transmission (RTTY, the Russian Woodpecker etc etc) produce horrible levels of interference, and DRM is really no worse. Fred E. N8UC -- Detroit wavetrapper wrote: IBOC is not authorized currently for night use. It is ok to turn it on at sunrise and have it run til sunset, I believe. Sunrise and sunset are the two prime DX times on MW. |
#4
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Kiwa MW Air-Core Loop Antenna {In-the-News} FS / FA
Byung Myung Sying wrote: I actually have my Kiwa Air-Core Loop (bought years ago when they were actually still being made) connected to my Yamaha RX-V4600 Home Theatre receiver which happens to be able to tune AM IBOC. It actually has a pretty good AM section. There are 3 local Detroit AM stations transmitting IBOC during the daylight hours. Two of them actually sound pretty good, the other one doesn't quite have their IBOC encoding working all that well and has lots of digital artifacts. The big problem, which kind of defeats the whole purpose is that, even with the help of the Kiwa Loop, AM IBOC cannot be received in "IBOC Mode" except for extremely strong local stations. Thus, even if I want to listen to "clear channel" digital stations at sunset or sunrise from other cities, the IBOC mode doesn't have enough digital signal to "latch on" to the digital broadcast. Thus, all the DX IBOC listener gets is a noisier, inferior AM DX signal, much worse sounding than it would have been without IBOC. I've tried tuning WBZ in Boston (an IBOC station) at sunrise, since they turn on their IBOC earlier than in Detroit (we're on the western edge of the Eastern Time Zone). They have an excellent analogue signal, but there's no hint of any detection of their IBOC signal. I also have DRM capabilities (a TenTec RX-350 receiver and computer sound card based software). As DXAce reports, the QRN from DRM transmissions to adjacent stations is JUST AS BAD OR WORSE than IBOC. However, since DRM doesn't share "bandwidth" with an analogue signal (as IBOC does), the sound quality of the received broadcasts are vastly superior -- truly FM table radio comparable. In addition, DRM is receivable over DX skywave conditions. I enjoy broadcasts from Radio Luxembourg in the early morning hours in true high fidelity stereo sound. DRM also allows vastly superior coverage with lower transmitter power. Listening to the late-afternoon DRM transmission of Radio Nederland from Bonaire with 5 kW, I get no dropouts and excellent audio quality. I doubt that shortwave broadcasting has much of a future, even with DRM. Antenna real-estate is just too expensive and environmental laws are stricter. However, those who complain about the QRN from DRM broadcasts should consider that all forms of digital transmission (RTTY, the Russian Woodpecker etc etc) produce horrible levels of interference, and DRM is really no worse. Well it certainly would be nice if the QRM (DRM) would migrate to a nice little band of their own instead of QRMing everything else with their excessive bandwidth. DRM = QRM Die DRM, die. Oh, by the way, I recall folks saying that SWBC was dying 40 years ago. Guess what? It ain't happened yet. dxAce Michigan USA |
#5
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Kiwa MW Air-Core Loop Antenna {In-the-News} FS / FA
I forget the Great City of Detroit Radio Station Call Sign/Lettes,but no
problem at all (WJR?) for me to pick up Detroit at night time. cuhulin |
#6
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Kiwa MW Air-Core Loop Antenna {In-the-News} FS / FA
Just a guess, but is the bandwidth big enough with the Kiwa? I'm
guessing you need 40Khz BW. IBOC should work with a wellbrook, since they are untuned. Byung Myung Sying wrote: I actually have my Kiwa Air-Core Loop (bought years ago when they were actually still being made) connected to my Yamaha RX-V4600 Home Theatre receiver which happens to be able to tune AM IBOC. It actually has a pretty good AM section. There are 3 local Detroit AM stations transmitting IBOC during the daylight hours. Two of them actually sound pretty good, the other one doesn't quite have their IBOC encoding working all that well and has lots of digital artifacts. The big problem, which kind of defeats the whole purpose is that, even with the help of the Kiwa Loop, AM IBOC cannot be received in "IBOC Mode" except for extremely strong local stations. Thus, even if I want to listen to "clear channel" digital stations at sunset or sunrise from other cities, the IBOC mode doesn't have enough digital signal to "latch on" to the digital broadcast. Thus, all the DX IBOC listener gets is a noisier, inferior AM DX signal, much worse sounding than it would have been without IBOC. I've tried tuning WBZ in Boston (an IBOC station) at sunrise, since they turn on their IBOC earlier than in Detroit (we're on the western edge of the Eastern Time Zone). They have an excellent analogue signal, but there's no hint of any detection of their IBOC signal. I also have DRM capabilities (a TenTec RX-350 receiver and computer sound card based software). As DXAce reports, the QRN from DRM transmissions to adjacent stations is JUST AS BAD OR WORSE than IBOC. However, since DRM doesn't share "bandwidth" with an analogue signal (as IBOC does), the sound quality of the received broadcasts are vastly superior -- truly FM table radio comparable. In addition, DRM is receivable over DX skywave conditions. I enjoy broadcasts from Radio Luxembourg in the early morning hours in true high fidelity stereo sound. DRM also allows vastly superior coverage with lower transmitter power. Listening to the late-afternoon DRM transmission of Radio Nederland from Bonaire with 5 kW, I get no dropouts and excellent audio quality. I doubt that shortwave broadcasting has much of a future, even with DRM. Antenna real-estate is just too expensive and environmental laws are stricter. However, those who complain about the QRN from DRM broadcasts should consider that all forms of digital transmission (RTTY, the Russian Woodpecker etc etc) produce horrible levels of interference, and DRM is really no worse. Fred E. N8UC -- Detroit wavetrapper wrote: IBOC is not authorized currently for night use. It is ok to turn it on at sunrise and have it run til sunset, I believe. Sunrise and sunset are the two prime DX times on MW. |
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