[Elecraft] Width of AM filter

[Steve Ellington]

Wayne
It seems odd to have to purchase an expensive filter to obtain a wider 
bandwidth doesn't it? Isn't there some way to just bypass the filter and 
rely on DSP?
I still would appreciate more bandwidth for CW. 2.7khz is far too narrow for 
comfortable monitoring while working around the shack. I know it takes some 
programing but from a layman's point of view, it seems like a simple request 
and it would certainly improve the product.
73
Steve Ellington
N4LQ at carolina.rr.com
----- Original Message ----- 
From: "wayne burdick" <n6kr at elecraft.com>
To: "Gerard Jendraszkiewicz" <jend at uchicago.edu>
Cc: <elecraft at mailman.qth.net>
Sent: Thursday, March 26, 2009 2:39 PM
Subject: Re: [Elecraft] Width of AM filter


> Jerry,
>
> The WIDTH control sets the final audio bandwidth, which is limited to 5
> kHz in AM mode. But in AM mode, the crystal filter bandwidth needed is
> 2x the audio bandwidth, or 10 kHz in this case, because it has to pass
> both sidebands. To obtain this full bandwidth, you'd have to have the
> 13 kHz FM filter installed. The AM filter is only 6 kHz wide (an
> industry standard), and if that's the widest filter you have, you're
> actually getting only a little over 3 kHz of audio bandwidth even if
> you set the WIDTH control to max (5 kHz).
>
> 73,
> Wayne
> N6KR
>
> On Mar 26, 2009, at 11:23 AM, Gerard Jendraszkiewicz wrote:
>
>> Hello,
>>
>> I have K3 with KFLA-6K. I can only adjust the width to 5.0 using the
>> width knob on the K3. I use AM to listen to the AM BCB and some SW. I
>> remember getting a wider width in the past ?? Any suggestions ?
>>
>> Thanks
>> Jerry, KE9I
>>
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>
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>
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