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AM-HD 'on the list' but not in use?

J

JohnnyElectron

I've noticed a fair number of stations on 'the list' (from iBiquity saying who has AM-HD 'on the air') that don't use HD at all at night, and never have since the September 14th night turn-on date. Among them, I count the 50KW station on 1530 from Cincinnati and 1000 from Chicago. Any other 'offenders'? Can any of the locals confirm it they use it during the day, as I don't even get a flashing "HD" while I have a very decent analog signal?
 
AM 1000 in Chicago is not using HD, and I haven't ever heard them testing it.
As I am only using continuous tuned radios, it would be impossible to miss.
 
Here is the more accurate list.

http://topazdesigns.com/iboc/station-list.html

iBiquity's list reflects stations which have licensed and installed IBOC... but are not necessarily using it. Some AM stations have installed IBOC but are purposely not using it due to the lack of receivers in the marketplace and the anticipated complaints about how it would negatively affect their analog signal.
 
JohnnyElectron said:
I've noticed a fair number of stations on 'the list' (from iBiquity saying who has AM-HD 'on the air') that don't use HD at all at night, and never have since the September 14th night turn-on date. Among them, I count the 50KW station on 1530 from Cincinnati and 1000 from Chicago. Any other 'offenders'? Can any of the locals confirm it they use it during the day, as I don't even get a flashing "HD" while I have a very decent analog signal?
Click to expand...

I'm pretty sure that WCKY-1530 still runs it during the day. I think the same is true of WMVP-1000, but I'm less sure about that one. WMVP reportedly has serious pattern bandwidth issues with their nighttime directional array, and won't be running HD at night anytime true. WCKY may have similar issues... I dunno for sure. It would be interesting to see WMVP fire it up at night, as its potential interference to CFRB-1010 is one of the nastier scenarios I've come across.
 
Come to think of it, I have been checking 1550 in the past few months as it's not used in Chicago, and I once had my pt 15 there, so I'd been comparing it to 1620 and 1630.
I have heard the WCKY 1530 HD sidebands on 1550, but only a little and only at critical hours.
 
I've noticed that CFRB is getting hammered by WBZ's IBOC in eastern Ontario....there's a really loud hiss...it's not as bad as KDKA which is pretty much gone here now.
 
"Reliable sources" inside Citadel report that critical tuning networks in the WMVP 1000 phasing system to produce very deep nulls do not produce the necessary pattern bandwidth for "successful" implentation of HD-AM. ("Successful" in IBOC terms means....well....never mind.) The sideband amplitudes are asymmetrical so there is at least potentially severe self-interference with the analog signal.

We had a similar report about WINS 1010 in NYC. And KDKA's Franklin NDA antenna.

These stations would have to rebuild their entire directional systems to be able to use HD-AM, costing millions of dollars. They could go through all that and it still might not work very well.
 
Savage said:
"Reliable sources" inside Citadel report that critical tuning networks in the WMVP 1000 phasing system to produce very deep nulls do not produce the necessary pattern bandwidth for "successful" implentation of HD-AM. ("Successful" in IBOC terms means....well....never mind.) The sideband amplitudes are asymmetrical so there is at least potentially severe self-interference with the analog signal.

We had a similar report about WINS 1010 in NYC. And KDKA's Franklin NDA antenna.

These stations would have to rebuild their entire directional systems to be able to use HD-AM, costing millions of dollars. They could go through all that and it still might not work very well.
Click to expand...
For several weeks in a row, WINS was recently going off the air in the early AM hours on weekends. They claimed it was part of their process of "upgrading to HD", but it was likely exactly what you said: testing and measuring the directional array to see if it'll handle IBOC... and as anyone who has heard the horribly distorted nulls that WINS has all across New Jersey can tell you, the answer is likely no. Of all the 50 kW NYC AM signals, WINS and WQEW have the worst daytime signal quality in NJ.

Adding HD would just make an already marginal analog AM signal even worse. I'm about 25 miles away from WINS's transmitter, and lately at night the signal from CFRB in Toronto is murdering them, worse than I've ever heard before. (Likewise, 1050 CHUM is often doing a number of WEPN's nighttime signal.)
 
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