Originally Posted by dattier
The question is not why they discontinued it but why they ever had it, and why WTTW had had it, and why WXFT and WYCC still do.
That's without counting LiveWell (Trip reported an explanation for that) or MundoFox (I mentioned a wild-rump guess theory for that).
There was a time when Univisión had SD simulcasts of WXFT and WGBO on each other's channels as backups after an incident where one's transmitter went out; but they stopped that of WGBO and moved WXFT's to the same frequency and signal as WXFT-HD, where it doesn't help in case of a transmitter failure.
WYIN initially had simulcasts for testing purposes (when they upgraded to HD), with the intention of offering separate programming on the subchannels. They also wanted to run dual HD, which didn't work out too well for them (still doesn't work too well for ABC, since Livewell in HD looks horrible). For WYIN, they only got one channel programmed that isn't a simulcast. For now, their simulcast is done, & they simply decided to go 1080i on the main channel, though it might not have been needed.
Since I never watched much DTV before April 2009 (when I got the outdoor antenna hooked up, & hooked up the converter boxes, though 1 TV was replaced with an HDTV last year), I never knew WTTW had a simulcast. The TV tuner card I was using on an old Compaq Presario (card was bought in 2006) with a crappy antenna made for semis, did not pick up many channels from Chicago. With that crappy antenna, I only got RF 17, 19, 29 (sometimes), 36 (though it pixelated a lot), 51, & out of core channels 53 & 59, since they were on enough power to decode. I do know that WYIN was simulcasting the former Create subchannel, after WYIN dropped Create for cost reasons (not sure which subchanel it was, since the tuner card didn't list channels at all, just what stations called their channels. Once that same tuner card was hooked to a real outdoor antenna (the old-fashion element antenna), it picked up all full power stations, including WBBM-TV on RF 3. Supposedly, Univision will end the simulcast on 60.2 when they start carrying Get TV. Not sure what it would take for WYCC to end their SD simulcast.