Johnny, Yes, that is an excellent suggestion, especially if the K3 power supply is a switcher. 73, Don W3FPR On 7/6/2011 9:05 PM, Johnny Siu wrote: > Hello Don, > > I would even play a more safe game to distinguish whether it is a true birdie. How about using a 12v battery instead of a power supply unit during the test? > > TNX& 73, >