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Why is 95.5 About 7 Seconds Behind?

R

RoddyFreeman

My clock radio is tuned to 750AM as it's always been. But as I'm going to listen as I nod off to sleep at night, I turn the radio on--it's at 750--and then change it to 95.5 FM. When I arrive at 95.5, I hear what I just heard seconds earlier on 750.

Just curious as to why that is.
 
RoddyFreeman said:
My clock radio is tuned to 750AM as it's always been. But as I'm going to listen as I nod off to sleep at night, I turn the radio on--it's at 750--and then change it to 95.5 FM. When I arrive at 95.5, I hear what I just heard seconds earlier on 750.

Just curious as to why that is.
Click to expand...

They added IBOC....HD radio to 95.5 about three weeks ago. So, now it has the requisite 7 to 8 seconds diversity delay.
 
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When Georgia Tech was on 106.7, I tried getting the pxp from the radio while watching the game on TV. Radio was about a full play behind the TV and was too painful to listen to.
 
jabba17 said:
When Georgia Tech was on 106.7, I tried getting the pxp from the radio while watching the game on TV. Radio was about a full play behind the TV and was too painful to listen to.
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HD Radio has a “live mode,” which essentially puts the FM signal into analog mode but still allows you to link to the digital signal(s) if you have them saved. It’s a little clunky if you’re wanting to listen to a subchannel, but it’s designed for sporting events, and most listeners to the subchannels probably tune them in directly anyway.
 
Kent said:
HD Radio has a “live mode,” which essentially puts the FM signal into analog mode but still allows you to link to the digital signal(s) if you have them saved. It’s a little clunky if you’re wanting to listen to a subchannel, but it’s designed for sporting events, and most listeners to the subchannels probably tune them in directly anyway.
Click to expand...

This was on a regular analog FM radio...
 
jabba17 said:
This was on a regular analog FM radio...
Click to expand...

When done properly, the analog signal will be delayed to correspond to the digital signal, and that would, of course, include analog radios. Because the digital signal has to link, the analog and digital signals are supposed to blend perfectly. If you've ever listened to an analog station blend to digital without a proper delay, it really hurts your ears!

When using "live mode" with HD Radio, the analog broadcast will be live, and the listener has to manually link to the HD signal if (s)he wants digital. Otherwise, the HD Radio will just air the analog signal. The only reason one would typically switch to digital in that situation would be if they wanted to listen to a subchannel that wasn't already saved as a preset. Otherwise, the main channel won't blend perfectly and will be running behind.
 
Kent said:
When done properly, the analog signal will be delayed to correspond to the digital signal, and that would, of course, include analog radios. Because the digital signal has to link, the analog and digital signals are supposed to blend perfectly. If you've ever listened to an analog station blend to digital without a proper delay, it really hurts your ears!

When using "live mode" with HD Radio, the analog broadcast will be live, and the listener has to manually link to the HD signal if (s)he wants digital. Otherwise, the HD Radio will just air the analog signal. The only reason one would typically switch to digital in that situation would be if they wanted to listen to a subchannel that wasn't already saved as a preset. Otherwise, the main channel won't blend perfectly and will be running behind.
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Kent: The issue is the top of hour tone is now 8 seconds late. An easy correction...hit the tone 8.??? seconds early. (Depends on precise amount of delay being added to analog signal to sync to HD1)

Why doesn't WSB get rid of that anyway? It has never been anywhere close to correct by NTP standards (although it has been years since I measured it.)
 
wavo said:
Why doesn't WSB get rid of [the top of the hour tone] anyway?
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OK, here's how old I am, and how easily my brain remembers the silliest of things...

I remember the late, great Bobby Harper making a big deal about the debut of the WSB tone. Probably 1990. He waited until right before the top of the hour and pretended he was reading the instruction manual on how to turn it on and activate it. Then, when it was a couple of seconds from the top of the hour, he said something like, "OK, you hit this button, and ..." BEEEEEEP! :D

Bobby Harper was one of a kind.
 
wavo said:
Kent: The issue is the top of hour tone is now 8 seconds late. An easy correction...hit the tone 8.??? seconds early. (Depends on precise amount of delay being added to analog signal to sync to HD1)

Why doesn't WSB get rid of that anyway? It has never been anywhere close to correct by NTP standards (although it has been years since I measured it.)
Click to expand...


That would be like taking the teletype sound off of WINS. Just wouldn't sound right.
 
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