Re: [TenTec] PBT and other issues.

[Jim Brown <k9yc@audiosystemsgroup.com>]

On 10/29/2014 8:24 AM, Rick - DJ0IP / NJ0IP wrote:
> Although we speak of filters as being 2.4 kHz or 500 Hz bandwidth, that is only 
> a small part of the story.
> The bandwidth we state here is the "6dB bandwidth".  Perhaps more important is the 
> "60dB bandwidth".
Also important is the amplitude and phase response WITHIN the passband. 
Poor design can produce poor phase response, which degrades speech 
intelligibility. This was a major shortcoming of the Elecraft K2 -- it 
sounded fine listening through the full bandwidth TX filter, but when 
the multipole CW filter was realigned for narrow SSB it was hard to 
listen to.
73, Jim K9YC