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Graveyarders using IBOC

B

Buckeyes2001

Checking out http://topazdesigns.com/iboc/station-list.html to see who's using IBOC and when, I noticed that a few graveyarders are on IBOC including:

1230 - WCWA/Toledo, OH
WTKG//Grand Rapids, MI

1240 - WBUR/W. Yarmouth, MA

1340 - KCFR/Denver, CO

1450 - WSDV/Sarasota, FL

1490 - KCFC/Boulder, CO

An interesting test of how far a graveyard signal actually travels at night might just be to try listening for the IBOC hash on an adjacent frequency if it's clear enough. Also I'm curious to know just how close you'd have to be to one of these stations to actually get an HD lock on them at night.
 
You'd have to be able to see the tower, the TV must be off, can't be under power lines, and there can't be a thunderstorm within 100 miles for you to get a graveyard AM in HD.
 
Buckeyes2001 said:
Checking out http://topazdesigns.com/iboc/station-list.html to see who's using IBOC and when, I noticed that a few graveyarders are on IBOC including:

1230 - WCWA/Toledo, OH
WTKG//Grand Rapids, MI

1240 - WBUR/W. Yarmouth, MA

1340 - KCFR/Denver, CO

1450 - WSDV/Sarasota, FL


1340 WIZE in Springfield Oh has Real Country in HD.




1490 - KCFC/Boulder, CO

An interesting test of how far a graveyard signal actually travels at night might just be to try listening for the IBOC hash on an adjacent frequency if it's clear enough. Also I'm curious to know just how close you'd have to be to one of these stations to actually get an HD lock on them at night.
Click to expand...
 
Nick said:
You'd have to be able to see the tower, the TV must be off, can't be under power lines, and there can't be a thunderstorm within 100 miles for you to get a graveyard AM in HD.
Click to expand...

And yet some companies still rush to get these Class IV IBOCs back on the air, even directional Class IVs, when they go off for some reason. You have to believe they think they will interfere with the Class IIIs so much they'll give up and go off the air.

Sorry, I don't like the letter classes (A, B, and C) as well. Not as descriptive, like you don't know if a Class B is on a clear or regional channel, and if a Class A is a I-A or I-B. And III-A and III-B told you who had the lowest NIFs, and which were shoehorned in with a lot of interference.
 
Depending on the adjacent channel interference (or lack thereof), it isn't impossible that the IBOC range could exceed the night analog coverage of some graveyard signals. That'd be a strange twist. I have heard non-graveyard analog signals that were so riddled with co-channel interference that they were unlistenable yet the IBOC hiss on the adjacent channels was dominant--but not good enough to get a lock.
 
I get a strong signal of 1450 WSDV up here in Tampa in the daytime but I can't hear any IBOC hiss on the adjacent frequencies.
 
Is there any concensus on the order of best to worst graveyard channels with regard to nocturnal adjacent channel QRM, or would this just vary all over the place?
 
Completely depends on where you are, and probably on ionospheric conditions from night to night as well. In general, there's so much RF being aimed up at the ionosphere from so many graveyarders spaced so evenly, that I suspect you're not going to notice much variation from channel to channel at most locations.
 
Supposing that 1kW signal on 1240 kHz travels up to 750 miles at night and that you would be getting every 1240 station from within that range at night - from here in Vermilion, OH, that would total 95 stations being received at once. Compare that with a more remote location such as Riverton, WY where there are 40 1240 kHz stations within a 750 mile radius. So there may be an audible difference between the locations or there may not. Perhaps there's a point where it sounds just as jumbled as more stations are piled on top of each other. I guess someone would have to do some comparative listening on a GY channel in a congested area and compare it to a GY channel in a remote area such as WY. Someone could try it on 2 different online listening posts. Of course along the coasts, you basically have half of a 750 mile +/- radius of signals being received.

As far as the reception of different GY frequencies, as Scott said, probably not much of a difference.

I'll have to try 1240 tonight and see if I notice any hash coming from WCWA 1230. I would try 1220 instead, but that gets hash from WPHT
 
The 1960 NAB Engineering Handbook shows a method of calculating the NIF of a Class IV, using the number of stations within certain annular rings. You would have to change a few things, like making them 1 kW, multiplying the values by 2, and if you really need to make it metric, you can change that too. Use David's site to find the Handbook. It seems like stations beyond 500 miles aren't counted. Under newer rules, first adjacents would be counted. I think you have to multiply by 20 to get the NIF after adding the values up. At the edges of the Northern US, where there are few stations to the north, the NIF is actually lower, any way you calculate it.
 
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