APF vs ordinary filters?

[Robert Morris]

Why is it that the APF is more effective than a narrow ordinary
DSP filter?
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Guy, K2AV]

The passband shape is that of an inverted "V" with a sharp tip.  While
this can be remarkably useless for tuning around, the regular passband
shapes being better for that, once a real weakie is discovered, tuning
the APF to it creates an immediate signal to noise improvement.  It is
so narrow though that one can tune past a weak signal and not hear it.

On Sat, Nov 6, 2010 at 11:51 AM, Robert Morris <[hidden email]> wrote:

> Why is it that the APF is more effective than a narrow ordinary
> DSP filter?
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html