I am have a KVH dome receiving standard definition only on my motorhome. Reception is perfect with the dome on standard definition. I would like to set up either my 18 inch round or my 5lnb on a tripod. I have no audible sound on the signal meter. In the past with standard def receiver I could turn the volume up and make adjustments while outside. Is there a way to get the audible sound on the HR24?