I am a tech and we only carry 722k 222k and 211k at our retail shop. We have ran into an issue with sometimes people only have two tv's and both only have coax input (crazy I know!). However, when we go to install a 222k (or 722k), TV2 is the only one that will display. I understand that this is because the modulator is turned off for TV1 by default. I have tried putting it in single mode and utilizing tv2 display to navigate in the menu etc for setup however, we get the common message that TV1 is using this screen an no changes can be made yadayadayada. I have yet to discover a work around other than carrying a rf modulator on the van for temporary use during installation. Anyone have better ideas?