KSDY-LD (50) and KTCD-LD (46) are both on CH. 31 so that is why you are getting interference. KSDY is on Mt. Miguel where all the other SD UHF stations are located. KSDY is currently running at 15kw and has a range of 34 miles.Starting on February 8, 2019, I started having difficulties receiving KTLA (ch 31). I suspected that some other TV station started broadcasting on channel 31 causing cochannel interference. However, I cannot identify any other channels that are planned to move to channel 31, other than KCBS, after KTLA moves to channel 35. Anyone know where the channel 31 interference source is?