SV1760: Using the SV1760, I cannot reproduce audio and the video only works in a lower resolution than full HD, I have the following setup: PC (AV transmitter) --> Video Projector (AV Receiver)

The SV1760 does support FULL HD, but will set back the quality when distance is (too) big and/or there is interference from any other wireless signals.
To support audio, you should set up the right settings in PC/Notebook. When HDMI is connected often there is an option/settings how to handle audio.