HDTV

[archived]

I have an avermedia 180 qam capable tuner I am having problems getting any reception. I currently have it hooked up to my comcast digital cable from vernon ct. I have  tried  3, 3000000 and 231 or 231000000 for transports and then tried to scan for channels. What is the format for frequency. Titantv says
ABC DT should be 231 how do I enter that under transport. I have followed instructions for mythtv .20 and cant get any reception. Please advise.