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Is there a complete list of HD2's and 3's that have analog FM translators?

In 'Bama we have several AMs on HD or translators, but only a few HD feeds that seem to be duplicated on FM.

In Auburn, WGZZ "Wings 94.3" carries the city's news/talker WANI on the HD-2, which feeds two translators. The HD-3 is an unbranded ESPN feed, which is carried on another translator in the Auburn area.

In nearby Montomgery, WXFX "The Fox" has just added two AMs to its HD lineup, talk WLWI and sports WBAM. One or both is expected to debut on area translators shortly.

In Birmingham, WQEN "The Q" has an HD-2 carrying rock "The Vulcan", which is heard on a translator. WERC-FM (talk radio) has an HD-2 carrying gospel "Hallelujah FM" that has just come on a translator from Red Mountain.

In Huntsville, the AM talk duo of WHOS/WBHP is carried on the HD-2 of WQRV "The River" and that's relayed on a translator atop Monte Santo Mountain.

If you're looking for purely HD feeds on translators, it's just the two Birmingham formats and the ESPN in Auburn.
 
There are a couple of reasons an AM station might designate an HD-2 or HD-3 simulcast as "primary station" for a translator:

AM translators must limit 60 dBu coverage to a 25 mile radius of the AM site, even if 2 mV/m primary coverage extends further. 25 miles is an arbitrary distance that the FCC came up with, but this rule fails to recognize that some AM stations provide 5 mV/m city grade coverage well beyond 25 miles and pay annual regulatory fees based on the total daytime 5 mV/m population. A lousy deal when you want to serve those people at night with the translator but you're forced to comply with the 25 mile circle.

Now here's the loophole: A translator rebroadcasting an FM station has no arbitrary distance limit and can provide service as far as the protected contour of the primary -- which, in the case of a Class B FM, would typically fall 35 to 40 miles out. So in some cases, there's a coverage advantage to be gained by designating the FM as primary.

Also, HD-2 or -3 can be used in lieu of an STL to feed AM program audio to the translator. Needless to say, the lossy HD codec will degrade audio quality compared with a full bandwidth 950 MHz STL (or a properly configured Barix or BRIC-Link running audio-over-IP) but I suppose it's a cheap way to make it work after you've burned up piles of money on the HD transmitter installation.
 
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