Tom, See page 35 of the K3 manual.
If APF is on, the SHIFT control set the audio frequency that you wish to hear. NORM restores that audio frequency to your set sidetone pitch - no other function is enabled.
The APF filter is quite narrow. While there is no downside to leaving it enabled, your tuning filters will be very narrow - good for digging signals 'out of the mud', but not good (IMHO) for tuning around to see what other signals may be present on the band.
I would suggest APF off for general tuning, and turn it on when you have to dig for a signal that otherwise might be buried in the noise or QRM.
73, Don W3FPR On 7/14/2014 5:10 PM, Tom wrote:
Hi I noticed that the dual PB function only works if the mode is cw and dual PB is set to APF in the tech mode menus. Is there a downside to always leaving this to APF as opposed to NOR? I mean you can turn APF on or off if set to APF, but not if set to NOR. Does the NOR enable another function? Thanks, Tom
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