wpiv926: you have ignored my question. Is it because you don't know what IBOC HD radio is, or are you being rude?
I looked it up myself. Yes, both KARN-AM and KARN-FM are equipped to do digital broadcasting. To do the approved version of digital which was designed created by Ibiquity, the program content MUST be delayed by seven seconds so that all the digital processing can take place. It is also required that the main analog channel must be synchronized by delaying it by seven seconds also. That way, as you drive down the street listening to the HD-IBOC digital signal, if the digital fades the received in your car will automatically switch to analog. And then when digital reception improves, it switches back. If the program content bounced back and forth by seven seconds every time it switched, you might get vertigo and upchuck all over your car.
I am sure the people at KARN would live for you to watch the game on TV and LISTEN on KARN and they wish it could be synchronized. Maybe someday they can convince TV to also delay 7 seconds. Then the people in towns where the radio station is NOT digital will complain.
Digital radio is very controversial right now. If you follow the conversation of station engineers on some Internet Bulletin Boards, you will find that a number of them are hoping IBOC fails and that the FCC will then turn to some other technology to improve the audio signal by digital technology.