[Elecraft] (K3) APF and selected bandwidth

[brian]

Part of the problem with narrower bandwidths is making sure the signal 
is at the APF peak.

I had fits trying to use APF with 200-400 Hz dialed in until I launched 
Spectrogram and made sure the signal peak aligned with the APF peak.
Weak signals still show even when you have trouble hearing them.  This 
alignment helps with pulling them out.  One can tune either the K3 shift 
knob or K3 main tuning if it is set at 1 Hz steps.

Works every time.

Spectrogram can be collapsed to a small rectangle for this purpose an 
permanently left on the display.  HSDR also has a narrow bandwidth 
display.  Other spectrum display programs would work as well.

73 de Brian/K3KO




On 10/16/2016 13:03 PM, Chip Stratton wrote:
> I seem to recall a recommendation to use a 400 Hz bandwidth with APF. In my
> own exerience, narrowing DSP bandwidth much below this does not seem to
> help APF function and rather muddies it.
>
> Chip
> AE5KA
>
> On Sat, Oct 15, 2016 at 11:44 PM, Brian Hunt <huntinhmb at coastside.net>
> wrote:
>
>> On the other hand, when used in conjunction with NR a wider DSP BW is
>> desirable since NR works on uncorrelated noise. Try:
>> BW= 700-1000 Hz,
>> NR= ~ 5-3
>> APF= ON
>> Great for pulling out weak signals on an uncrowded band. The NR settings
>> of 5 and above mix processed and non-processed data so the APF has
>> something to work on.  My theory, anyway.
>>
>> 73,
>> Brian, K0DTJ
>>
>>> On Oct 15, 2016, at 19:52, Ken Arck <ken at arcomcontrollers.com> wrote:
>>>
>>> The narrower the bandwidth, the better signal to noise.
>>>
>>> That should answer your question :-)
>>>
>>> Ken
>>>
>>>
>>> At 07:39 PM 10/15/2016, Robert G Strickland wrote:
>>>> When using the APF, does it make a difference which bandwidth has been
>> selected? Or in other words, does APF work better on top of a narrow or
>> wide bandwidth, or is selected bandwidth irrelevant? Thanks.
>>>> ...robert
>>>> --
>>>> Robert G Strickland, PhD ABPH - KE2WY
>>>> rcrgs at verizon.net.usa
>>>> Syracuse, New York, USA
>>>>
>>
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