[Elecraft] K3 APF/Dual PBT

[W0MU Mike Fatchett]

The APF will take signals in the noise and make them very readable. It 
is not something you will need to use all the time.

Mike W0MU

On 3/14/2015 10:47 PM, Fred Jensen wrote:
> Sounds like something is wrong Mike.  My CONFIG:DUAL PB toggles 
> between "nor" and "APF."
>
> The APF takes a little practice.  Except when I'm NCS of our traffic 
> net, I run about 250 Hz DSP BW.  I have found that the APF gets very 
> hard to tune with anything less than that and 300 Hz is even better. 
> APF performance also seems to be somewhat connected to AGC settings.
>
> Once I mastered it, mine works great, I use it all the time to pull 
> very weak SOTA guys running a few watts to a compromise antenna out of 
> the noise.
>
> 73,
>
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
> - www.cqp.org
>
> On 3/14/2015 9:31 PM, Michael Marx wrote:
>> When I go into my K3’s CONFIG menu to the Dual PB setting, The only
>> value I see in the screen is two dashes  —  Turning the knob that
>> normally will change a menu value has no effect.  I’m wondering if my
>> APF is working properly as even when I tune in a station on CW with
>> the APF, it is very, very hollow and rings a lot.  Maybe this is
>> normal.  It really does not help with a weak signal as it rings so
>> badly you can’t hear the weak signal.  I don’t think this is what is
>> supposed to happen?  The APF in my Icom IC746 works much better (and
>> probably shouldn’t).
>>
>> But it does seem that the item in the config menu doesn’t work at
>> all.  Is this normal, or is this because I’m using the latest beta
>> firmware or something is wrong.
>>
>> 73 all,
>>
>> Mike WB0SND
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