Scanning Federal With Close Call
I would forget about Close Call for this application, unless you know that you are close to your transmission source. I would just search the federal bands or enter the frequencies in the scanner sequentially. That way you can add PL/DPL/NAC codes as they are found. Also, at the risk of pointing out the obvious, many federal channels are quiet for long periods of time. It is NOT like listening to local public safety with calls being dispatched fairly often. Patience is a virtue when it comes to federal monitoring.