Quick backstory. 2 years ago my son bought a HR22-100 at Best Buy. We added it to my account. Now he has gotten married and had DTV installed at his house. DTV would not let him take that receiver with him and take it off my account. Since I will eventually replace the SD set with a HD,I want to keep it and not send it back. So my question is even though I know I will only have SD, will the receiver still work hooked up to a SD set?