ANALOG VS. IBOC: WIL 92.3 St. Louis, MO

 

Frequency            Before IBOC Activation                                                     After IBOC Activation

92.0 MHz               Very minor sidebands from WIL/K220HT                       IBOC Sidebands from WIL

92.1 MHz               Primarily KMFC Centralia, MO                                          Wiped out by IBOC Sidebands from WIL

92.2 MHz               Analog sidebands from WIL                                             Analog and digital sidebands from WIL

92.3 MHz               Center frequency                                                                 Center frequency

92.4 MHz               Analog sidebands from WIL                                             Analog and digital sidebands from WIL

92.5 MHz               Primarily WKIO Urbana, IL                                                 Wiped out by IBOC sidebands from WIL

92.6 MHz               Very minor sidebands from WIL                                       IBOC sidebands from WIL

 

This illustrates the fact that WIL’s IBOC operation wipes out 600 kHz of spectrum space. By contrast, analog takes up less than 200 kHz of space, and produces superior audio quality over IBOC. The audio quality of WIL was already CD-quality before they made the illogical step of switching to a spectrally inefficient technology that has no technical integrity. In addition, K220HT Webster Groves, MO, relaying KTBJ 89.3 Festus, MO on 91.9 MHz, suffers from interference to the Stereo pilot from WIL’s IBOC sidebands; the mono signal is also affected, impairing the ability of KTBJ to perform their ministry outreach in the St. Louis area. This was measured at Hazelwood, MO using a modified Kenwood AR-304 AM/FM/FM Stereo receiver with a selectivity modification by Dr. Bruce Elving at FM Atlas, with an Antenna Performance Specialties APS-9B nine-element FM yagi antenna at 26 feet (7.9 meters) above ground level.