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

[Dave or Debbie Metz]

If my recollection is right, the reason for the 16 KC was to copy the 
mulit-channel broadcast which had 16  channels that could be broken down in 
the "black" and then sent to individual TTY decryption machines such as the 
KWR 37's. Each channel could have it's own keycard depending upon the use, 
Hicom, Intelligence, broadcast, supply, security group, etc. Never used for 
voice, only data.
dave




At 09:03 AM 8/29/2005, Steve Byan wrote:

>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
>
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