I agree BSCO. When I am using a call, after I can see the deer, I dont do more than one call every 5 minutes or so at the max. The reason I do it like that is so they wont see me. If they are interested in your position it is more likely for them to see or smell you because they are interested in that area. I normally just use a call to stop a deer to get off a shot once they are in sight range. I am not a seasoned bow hunter though. 90% of my experience is with a rifle. I finally felt comfortable enough with a bow this year and I wont turn back to a rifle now! Makes the game that much more fun and a longer season I will admit though, I prefer ground hunting and stalking. Not only get them in, but stalking the prey is a rush!
Stryker777