[Elecraft] APF vs 10 Hz DSP, why they don't sound the same

[Jan Babinec]

 Hi there,
 the APF in TS930S is very effective too. It saved me MANY
 TopBand QSOs! Especially thru rough summer QRN, 
 switch  AGC off, wide filters plus APF allowed to hear the weak ones.
 Such a filter is VERY high on my K3 wish list.

                          Jan OM2XW 
 

> Date: Sat, 15 Aug 2009 16:03:54 -1000
> From: k9fd at flex.com
> To: olinger at bellsouth.net
> CC: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] APF vs 10 Hz DSP, why they don't sound the same
> 
> Guy, your missing the whole point of what APF is and what is does,
> has nothing to do with selectivity,   nothing to do with skirts at all,
> it is in the audio chain and there for no effect or cause with AGC
> Is rarely if ever used on a signal that is loud enough to copy,
> its mainly used for signals that are at the noise level or very weak.
> Narrow bandwidth can be the enemy of APF.  Many
> times copy at wider width is the best with APF.
> APF never drops off the signal,  it enhances it. 
> APF = Audio Peak Filter   not DSP or some other
> manipulation to try and fake it. 


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