[Elecraft] Hearing the effect of narrower roofing filter

[hank k8dd]

----- 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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