KWMU: Analog vs. IBOC

Frequency Without IBOC With IBOC

90.4 MHz clear Wiped out by digital sidebands from KWMU

90.5 MHz WSCT Springfield, IL (good signal) Wiped out by digital sidebands from KWMU

90.6 MHz Analog sidebands from KWMU Analog and digital sidebands from KWMU

90.7 MHz center frequency center frequency

90.8 MHz Analog sidebands from KWMU Analog and digital sidebands from KWMU

90.9 MHz WILL-FM Urbana, IL (fair signal) Wiped out by digital sidebands from KWMU

91.0 MHz Analog sidebands from WIBI Wiped out by digital sidebands from KWMU

91.1 MHz WIBI Carlinville, IL (semi-local signal) WIBI Carlinville, IL (good signal)

In the case of KWMU, it not only cuts into the coverage of WIBI, but near their transmitter site near Oakville, MO, the digital sidebands severely reduce or wipe out the signal of KBGM Park Hills, MO, which simulcasts WIBI Carlinville, IL. It also wipes out signals from WSCT in Springfield, IL (another relay for WIBI) and WILL-FM in Urbana, IL at this location. The digital sidebands from KWMU also cuts into WIBI’s signal coverage in much of northern St. Louis County, MO and Madison County, IL.

Remember that these measurements were taken using analog receivers.