[R-390] 16kHz filter and SWL/BC listening

[Steve Byan]

On Aug 28, 2005, at 4:49 PM, Tim Shoppa wrote:

> To my ear when listening to SW and BC broadcasts (voice, music, 
> whatever)
> the 16kHz filter setting always sounds pretty much just like 8kHz just
> with more hiss.

> Is this a fundamental limitation of the AF chain, or is my hearing just
> wacky, or is there some simple technical fix?

On SW and BC broadcasts, the transmitted signal is bandwidth-limited, 
so there isn't much more bandwidth to let through with the 16 KC 
filter, especially if  the 8 KC filter is tuned off to the side a bit. 
On SW broadcast, you're lucky to get 5 KC of transmitted bandwidth.

Regards,
-Steve
--------
Steve Byan <stevebyan at mac.com>
Littleton, MA