Rob van der Putten wrote:
Hi there
Heiko Gerstung wrote:
From our DCF77 info page (http://www.meinberg.de/english/info/dcf77.htm):
"In order to increase the accuracy of the demodulated time marks, the
carrier of DCF77 is additionally modulated with a pseudo-random phase
noise. The pseudo-random sequence has a length of 512 bits which are
transmitted in the time interval between the AM marks. Due to the
pseudo-random characteristics of the sequence, the mean deviation of the
carrier phase is still zero. The phase modulated carrier can be received
with a larger bandwidth. Correlation algorithms known from satellite
techniques let PZF receivers determine the correct time with an accuracy
of some microseconds which is much superior to the accuracy achieved by
standard AM receivers."
Any more in depth info?
The PTB only provides a few sentences here:
http://www.ptb.de/en/org/4/44/442/_index.htm
But they offer to give you more detailed informations on request, so
maybe you just want to contact them directly.
AFAIK we (Meinberg) are the only vendors offering such a technology. See
for example:
NTP Time Server with PZF receiver:
http://www.meinberg.de/english/products/lanpzf.htm
Radio Clock Module
http://www.meinberg.de/english/products/pzf510.htm
(this one can be ordered as a standalone rack-mountable system with
power supply and housing)
and any other products with a "PZF" in their name :-)
Found those.
I was just wondering if there are any more.
As I said, I do not know any other vendors, but if you find any, please
let me know :-)
Regards,
Heiko
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