Hi
OK got it now.  
I was doing some programming of these functions looking mainly at the api and 
things didn't seem to make sense.
Thanks! 




-------- Original message --------
From: Don Wilhelm <[email protected]> 
Date: 14/07/2014  9:08 PM  (GMT-05:00) 
To: Tom <[email protected]>,Elecraft Mailing list <[email protected]> 
Subject: Re: [Elecraft] K3 Dual PB 
 
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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