filter settings and hearing

[John Wiener]

Hi,

I have an odd question for the group.

As hams age, we begin to notice that our hearing decreases in  
sensitivity in the higher registers.
In a K2, one can easily change the Spot audio frequency downward to  
accommodate this process.

Is it straightforward to adjust the filters so their center  
frequencies are lower, too?

Or am I way off the charts on this one?

John
AB8O
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[David A. Belsley]

Yes, John, both the variable filters and the DSP filters may be  
adjusted for center frequency.  However, while we older folk may lose  
our abilities to hear, say, above 4000 Hz, there is not likely to be  
a significant loss differential in the range for typical side tones,  
say 550-1000 Hz.  This is, after all, roughly in the octave range of  
C'-C'' on the piano, and isn't really all that high.

best wishes,

dave belsley, w1euy


On Sep 18, 2006, at 8:39 PM, John Wiener wrote:

> Hi,
>
> I have an odd question for the group.
>
> As hams age, we begin to notice that our hearing decreases in  
> sensitivity in the higher registers.
> In a K2, one can easily change the Spot audio frequency downward to  
> accommodate this process.
>
> Is it straightforward to adjust the filters so their center  
> frequencies are lower, too?
>
> Or am I way off the charts on this one?
>
> John
> AB8O
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
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> Elecraft web page: http://www.elecraft.com

-------------------------------------
david a. belsley
professor of economics

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[Don Wilhelm-3]

John,

Not an odd question at all:

Certainly it is possible (and desirable) to center the CW filters at your
chosen sidetone pitch.
Adjust the BFO frequencies to do just that.  Spectrogram is the tool of
choice for most folks to adjust the passband positioning.  If you have not
used it before, I refer you to the info on my website
http://w3fpr.qrpradio.com in the K2 dial calibration article, and also to
the information that Tom Hammond has on his website www.n0ss.net .  Yes it
is a straightforward procedure - do not be intimidated by the number of
words used to tell folks how to do it - just follow the steps one time
through and you will be a pro.

73,
Don W3FPR

> -----Original Message-----
>
> I have an odd question for the group.
>
> As hams age, we begin to notice that our hearing decreases in
> sensitivity in the higher registers.
> In a K2, one can easily change the Spot audio frequency downward to
> accommodate this process.
>
> Is it straightforward to adjust the filters so their center
> frequencies are lower, too?
>
> Or am I way off the charts on this one?
>
> John
> AB8O
>

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[Tom Hammond-3]

Hi John:

I suspect several (probably many) have already beat me to the punch
on this one, but...

Yes, it's quite easy to change the sidetone and filters to a
different frequency. However, it's best (and most easily)
accomplished with Spectrogram and your PC sound card connected to the
K2. With that combination (and the docs), you can realign the filters
in a matter of a few minutes.

Spectrogram v5.1.7 (shareware), and the docs are available at www.n0ss.net

73,

Tom Hammond    N0SS

At 07:39 PM 9/18/2006, John Wiener wrote:

>Hi,
>
>I have an odd question for the group.
>
>As hams age, we begin to notice that our hearing decreases in
>sensitivity in the higher registers.
>In a K2, one can easily change the Spot audio frequency downward to
>accommodate this process.
>
>Is it straightforward to adjust the filters so their center
>frequencies are lower, too?
>
>Or am I way off the charts on this one?
>
>John
>AB8O
>_______________________________________________
>Elecraft mailing list
>Post to: [hidden email]
>You must be a subscriber to post to the list.
>Subscriber Info (Addr. Change, sub, unsub etc.):
>http://mailman.qth.net/mailman/listinfo/elecraft
>
>Help: http://mailman.qth.net/subscribers.htm
>Elecraft web page: http://www.elecraft.com

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[Darwin, Keith]

When I did my filter alignment with spectrogram I found the perceived
tone center lowered progressively as I went from wide to narrow.  I went
back and redid the alignment with spectrogram in logarithm display mode
and the tone center became consistent from wide to narrow.

- Keith KD1E -
- K2 5411 -

-----Original Message-----

>Is it straightforward to adjust the filters so their center frequencies

>are lower, too?
>
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