The operation of major-market Class As in IBOC mode seems increasingly erratic these days, at least under reception conditions here in Western New York - with the unfortunate (for WYSL) and notable exception of WBZ. The station's upper IBOC saddlebag is utterly obliterating WYSL's nighttime coverage. For several nights WBZ has been invading a WYSL signal strength of over 18 mv/m, at a measurement point 0.9 sm from the station, with clear reception of the station often not possible until you're on the Tx site. That's a local GROUNDWAVE approaching FOUR times city-grade. Forget about Rochester which is largely within the WYSL 5.0 and 2.5 (I've been lectured by pro-IBOCers about how WYSL is "not entitled" to that coverage. The mantra chanted over and over is, "you're only entitled to your nighttime interference-free," which in WYSL's case is 13.687 mv/m. This is an utter falsehood, a typical talking-point (lie) being circulated to push HD while trying to intimidate smaller operators who may lack the in-house technical expertise to deflect the argument. BTW, this is NOT the case at WYSL.
If the only thing that matters is the NIF, why does the Commission require plotting predicted 5 and 2 contours? And the rules never envisioned a scenario where ALL COVERAGE OUTSIDE THE NIF was to be utterly worthless. If this was the FCC's intent to change the coverage rules for AM to this extent, where was the rulemaking proceeding pursuant to which broadcasters could have commented?
Essentially, HD-AM amounts to "AM spectrum eminent domain" with no compensation to stations whose coverage has been stolen by large-market stations pointlessly pursuing the hapless, clueless HD-AM experiment. And which, after four years of frantic attempts to force the market, is going down in flames THREE WEEKS after its launch....on the whopping fewer-than-100 stations which have attempted it.
Another BTW: WBZ is ignoring WYSL's interference complaint. So much for the argument that "unusual cases of IBOC interference will be dealt with on a case-by-case basis."