[time-nuts] WWVB d-psk-r down conversion method...

Charles Steinmetz csteinmetz at yandex.com
Tue Sep 23 14:06:16 EDT 2014

Alex wrote:

>The old AM format was happy with cca 200Hz bandwidth to recover the 
>time information, which was utilized in many professional receivers, 
>which used a crystal filter for 60kHz, for the PSK format the 
>required bandwidth is at least five times wider, so crystal filter 
>would be problematic and much more costly, the higher required 
>bandwidth brings also more noise ....actually where is the advantage 
>of the new modulation scheme?

The changes were made to make today's consumer "atomic clocks" more 
robust, not to help any kind of "professional" receivers (whether 
time or frequency).

Best regards,


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