Kmox: analog vs. iboc
Until April
of 2000, KMOX (the Once-Mighty ‘Mox) broadcast in the
technologically advanced and near-CD quality sound of AM Stereo, using Motorola’s
proven C-QUAM system. KMOX began broadcasting in low-definition digital (as
opposed to high-def C-QUAM) in the spring of 2006. Here’s what damage the conversion
has done during the daytime on an analog receiver at
Frequency With KMOX in Analog mode (Mono/Stereo) With KMOX
in Digital mode
1070 kHz KHMO
1080 kHz WRYT
1090 kHz WCRA
1100 kHz Clear Wiped out by KMOX’s IBOC sidebands
1110 kHz Analog sidebands from KMOX Analog/digital sidebands from KMOX
1120 kHz Center frequency Center frequency
1130 kHz Analog sidebands from KMOX Analog/digital sidebands from KMOX
1140 kHz WVEL
1150 kHz WGGH
1160 kHz WYLL Chicago, IL (Poor signal) Wiped out by KMOX’s
IBOC sidebands
1170 kHz KUGT
Since KMOX
is a 50,000-watt Class A station, the potential for interference is greater.
The IBOC sidebands could also affect the reception of stations on 1050, 1060,
1180 and 1190 kHz. KMOX’s conversion to IBOC has
hampered the ability of WRYT Edwardsville, IL to be an effective radio
apostolate to the St. Louis Catholic community. Along State Road 162 near KMOX’s transmitter site in