[time-nuts] WWVB d-psk-r down conversion method...
alexpcs at ieee.org
Tue Sep 23 14:17:35 EDT 2014
it could be that the intention was good , but there is no reliable
"atomic clock" and the company which promised the chip still no t
delivered any usable, as I learned from two of my clients which are in
the were business of making "atomic clocks"
On 9/23/2014 11:06 AM, Charles Steinmetz wrote:
> 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).
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