DCF77 - presny cas

[Marek Kubita]

On Wed, 23 Jul 1997, Kristof Petr wrote:

> ted se mi do rukou dostal starsi katalog Conrad Electronics,
> kde nabizi radiem rizene hodiny DCF77 za 394,90 Kc.
> [...]
> Na adrese http://www.muc.de/~hm/linux/dcf77.html jsem nasel
> odkazy na programy, ktere by s tim mohly chodit.
> 

Podle dokumentace ke xntpd by mel byt tento prijimac podporovan (generic
driver). Kdysi jsem videl nejaky prijimac od Conradu u zakaznika,
pouzivali jej na DOSovem PC a meli s nim pri spatnem pocasi problemy
(Praha, pankracky kopec, antena v mistnosti).

V dokumentaci k NTP se take pise:

... AM DCF77 receivers are running as low as $25. The accuracy is
dependent on the receiver and is somewhere between 2ms (expensive) to 10ms
(cheap). Upon bad signal reception of DCF77 synchronizations will cease as
no backup oscillator is available as usually found in other reference
clock receivers. So it is important to have a good place for the DCF77
antenna. For transmitter shutdowns you are out of luck unless you have
other NTP servers with alternate time sources available ... 

coz odpovida tomu co jsem slysel: kdyz byl spatny signal, cas se rozjel
treba o minutu.

--- Marek Kubita                       home: kubitovi na mbox.lantanet.cz
                                       work: marek na corpus.cz