When I was in Chicago, I was tuned to a local station on 1530 Khz at around the time of sunset. At the same time, the digital sidebands of WCKY in Cincinnati, also at 1530 Khz could be heard on 1520 and 1540 as a loud hiss. If I was listening to a digital radio, would I hear the analog station in Chicago, or the digital station in Cincinnati? <P ID="edit"><FONT class="small">Edited by Len14043 on 01/22/06 08:09 AM.</FONT></P>
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Reception of HD-AM signal
- Thread starter Len14043
- Start date
K
k9ez
Guest
> When I was in Chicago, I was tuned to a local station on
> 1530 Khz at around the time of sunset. At the same time, the
> digital sidebands of WCKY in Cincinnati, also at 1530 Khz
> could be heard on 1520 and 1540 as a loud hiss. If I was
> listening to a digital radio, would I hear the analog
> station in Chicago, or the digital station in Cincinnati?
>
Depends on if the HD Radio could lock onto the digital signal. I am going to hae to try that at sunset as I THINK Cincy is allowed HD Radio until Sunset Sacramento and see what happens. Also there is a setting on HD Radio that wilol allow you to pick up JUST the DIgital Signal JUST the analog signal or do automatic recption.
> 1530 Khz at around the time of sunset. At the same time, the
> digital sidebands of WCKY in Cincinnati, also at 1530 Khz
> could be heard on 1520 and 1540 as a loud hiss. If I was
> listening to a digital radio, would I hear the analog
> station in Chicago, or the digital station in Cincinnati?
>
Depends on if the HD Radio could lock onto the digital signal. I am going to hae to try that at sunset as I THINK Cincy is allowed HD Radio until Sunset Sacramento and see what happens. Also there is a setting on HD Radio that wilol allow you to pick up JUST the DIgital Signal JUST the analog signal or do automatic recption.
W
westlife
Guest
> When I was in Chicago, I was tuned to a local station on
> 1530 Khz at around the time of sunset. At the same time, the
> digital sidebands of WCKY in Cincinnati, also at 1530 Khz
> could be heard on 1520 and 1540 as a loud hiss. If I was
> listening to a digital radio, would I hear the analog
> station in Chicago, or the digital station in Cincinnati?
Let me rephrase what you're saying: you can still hear the sideband "hash" of 1530 WCKY's skywave IBOC ("HD Radio") signal, even though a local station on 1530 kHz drowns out WCKY's analog signal on 1530.
I've experienced that myself many times, especially within an hour before sunset or an hour after sunrise: you can hear the sideband "hash" of an IBOC signal, but you can't hear the signal itself because other station(s) are covering it up on its main frequency.
In this situation, you won't be able to receive an IBOC digital signal from just its sidebands. The IBOC decoder needs to receive the station's main-channel signal in order to make any sense of it. Remember, unlike FM, AM radio does not have a "capture effect". If more than one signal is coming in on the same frequency, you'll just get a mix of the two signals, and unlike your human ears which can usually make some sense out of this mix, a digital signal decoder will be too confused to decode anything, so the IBOC receiver will just stay in regular analog mode.
<P ID="signature">______________
"This is the New York Emergency Broadcast System satellite channel. They took the crosstown bus."</P>
> 1530 Khz at around the time of sunset. At the same time, the
> digital sidebands of WCKY in Cincinnati, also at 1530 Khz
> could be heard on 1520 and 1540 as a loud hiss. If I was
> listening to a digital radio, would I hear the analog
> station in Chicago, or the digital station in Cincinnati?
Let me rephrase what you're saying: you can still hear the sideband "hash" of 1530 WCKY's skywave IBOC ("HD Radio") signal, even though a local station on 1530 kHz drowns out WCKY's analog signal on 1530.
I've experienced that myself many times, especially within an hour before sunset or an hour after sunrise: you can hear the sideband "hash" of an IBOC signal, but you can't hear the signal itself because other station(s) are covering it up on its main frequency.
In this situation, you won't be able to receive an IBOC digital signal from just its sidebands. The IBOC decoder needs to receive the station's main-channel signal in order to make any sense of it. Remember, unlike FM, AM radio does not have a "capture effect". If more than one signal is coming in on the same frequency, you'll just get a mix of the two signals, and unlike your human ears which can usually make some sense out of this mix, a digital signal decoder will be too confused to decode anything, so the IBOC receiver will just stay in regular analog mode.
<P ID="signature">______________
"This is the New York Emergency Broadcast System satellite channel. They took the crosstown bus."</P>
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