On Wednesday 22 December 2010 17:51:27 [email protected] wrote: > > Something I hadn't known about Clear Channel stations, apparently they > > all have this.... > > Steve > > I don't think they all do yet...or even many of them. I've yet to see any > gear installed for this at any of the stations I've visited.
I wonder if the source of the "growling"has been mis-identified. 16 Hz, after all, is pretty much below the lower limit of the human audio perception range. Since the station in question (KSL) also runs IBOC, consider the possibility that this is actually the source of the noise. The AM IBOC signal includes a pair of low frequency reference subcarriers (at +/- 182 Hz from the carrier) that are transmitted with a quadrature phase relationship so that they don't produce any audible output (in theory, at least) from an AM detector. If you tune to the signal in SSB mode, however, this relationship becomes unbalanced, and you can hear a low-frequency rumbling sound along with the program audio. Maybe this is the source of the "growling"? Barry -- Barry McLarnon VE3JF Ottawa, ON _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
