Maybe it's a problem with that TV's tuner? What happens if you use Ch4 instead of Ch3?
The DirecTV RF connection is only there at present because I used it while setting up the receiver, before I had unpacked the A/V cables. I will be putting the house channels on the TV tuner input when I go back there today, but I am going to have to advise him on whether to call DirecTV and request a replacement receiver at that time.jdspencer said:How does the resident switch between Directv (using RF) and the house supplied channels?
Using the composite inputs to the TV for DirecTV is the better way to do this.
I suspect that the DirecTV RF modulator is causing the problem.