[Elecraft] Hearing the effect of narrower roofing filter

[d.cutter at ntlworld.com]

Fine observations when you change the filter setting knob, but what makes you think you are hearing the effect of the roofing filter and not the dsp filter?  

David
G3UNA

> 
> From: "hank  k8dd" <k8dd at inbox.com>
> Date: 2008/07/08 Tue PM 02:29:08 BST
> To: "Jan Erik Holm" <sm2ekm at telia.com>
> CC: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Hearing the effect of narrower roofing filter
> 
> ----- Original Message ----- 
> From: "Jan Erik Holm" <sm2ekm at telia.com>
> Cc: <elecraft at mailman.qth.net>
> Sent: Tuesday, July 08, 2008 8:31 AM
> Subject: Re: [Elecraft] Hearing the effect of narrower roofing filter
> 
> 
> > Darwin, Keith wrote:
> >> each step.  When I step to 500 Hz and the narrow roofing filter kicks
> >> in, I can hear a distinct change, more than just the DSP narrowing I'd
> >> heard while stepping from 1000 Hz to 550 Hz.  The effect is very
> >> noticeable.
> >>
> >> - Keith N1AS -
> >> - K3 711 -
> > Keith,
> >
> > Can you describe this "change" closer.
> >
> > 73 Jim SM2EKM
> 
> Get two pieces of plastic pipe about a foot long.
> One six inches in diameter.
> One three inche in diameter.
> Close one eye and look at the mountains in the horizon and you will see a 
> wide view.  6000 Hz
> Put the six inch pipe up to the other eye.  You will see a portion of the 
> horizon - like 1000 Hz.
> Put the three inch pipe up to your eye.  500 Hz.
> The effect, as Keith says, is very noticeable!
> 
> 73    Hank    K8DD
> 
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