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><H1
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><A
NAME="RADIO-CLOCKS"
>4. $BEEGH;~7W(B</A
></H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN265"
>4.1. CHU $B$H(B $B!V(BGadget Box$B!W(B</A
></H2
><P
>CHU $B$H$O!"%*%?%o6a9Y$K$"$k%+%J%@C;GH;~Js6I(B (Canadian shortwave time station)
$B$N$3$H$G$"$j!"9g=09q$N(B WWV $B$KN`;w$7$?AH?%$G$9$,!"N><T$K$O$R$H$D$@$1=EMW$J(B
$B0c$$$,$"$j$^$9!#(BCHU $B$O1Q8l$H%U%i%s%98l$G;~Js$rDs6!$9$k$@$1$G$J$/!"(B
$B8E$$(B "Bell 103" (300 baud) $B%b%G%`%H!<%s$r;H$C$F0lJ,4V3V$G;~Js$rJ|Aw(B
$B$7$F$$$k$H$$$&E@$G$9!#$3$N%H!<%s$O%G%3!<%I$,Hs>o$KMF0W$G$"$k$?$a!"(B
Bill Rossi $B$O%b%G%`(B($B%G%3!<%@(B)$B$r;H$&$^$G$b$J$/!"C;GH%i%8%*$H%5%&%s%I%+!<%I$G(B
$B2r@O$G$-$k$3$H$rH/8+$7$^$7$?!#(BCHU $B$+$i$N?.9f$r<u?.$G$-$k$J$i!"$3$l$O(B
$B:G$b0B>e$,$j$JEEGH;~7W$H$7$F;H$($^$9!#C;GH$N<u?.>u67$O0lF|$N$&$A$K(B
$B2?EY$+JQ2=$7$^$9$,!"(BBill $B$K$h$k$H!"F|$KFs2s(B ($BD+$HM<J}(B) $B<~GH?t$rJQ$($l$P(B
$B$[$\(B 24 $B;~4V<u?.$G$-$k$=$&$G$9!#(BCHU $B$NJ|Aw$O(B 3.33, 7.335,
$B$*$h$S(B 14.670 MHz $B$G$9!#(B</P
><P
>$B>\:Y$O(B Bill Rossi $B$N%&%'%V%5%$%H(B
<A
HREF="http://www.rossi.com/chu/"
TARGET="_top"
>http://www.rossi.com/chu/</A
>
$B$r$4Mw$/$@$5$$!#%=!<%9%U%!%$%k$OCxL>$J%"!<%+%$%V%5%$%H$+$i$bF~<j$G$-$^$9!#(B
CHU $B$N;~Js%5!<%S%9$K$D$$$F$O!"(B
<A
HREF="http://www.nrc.ca/inms/time/ctse.html"
TARGET="_top"
>http://www.nrc.ca/inms/time/ctse.html</A
> $B$r8+$F2<$5$$!#(B</P
><P
>$B!V(BGadget Box$B!W$H$$$&%W%i%s$,(B NTP $B%&%'%V%5%$%H$K$"$j$^$9!#$3$l$O0B2A$J(B 300
baud $B$N%b%G%`$HE,Ev$JC;GH%i%8%*$r;H$C$F(B CHU $B$N;~Js$r%G%3!<%I$9$k$H$$$&(B
$B$b$N$G$9(B <A
HREF="http://www.eecis.udel.edu/~ntp/ntp_spool/html/gadget.htm"
TARGET="_top"
>http://www.eecis.udel.edu/~ntp/ntp_spool/html/gadget.htm</A
>$B!#(B
$B$3$N%W%i%s$G$O@lMQ$NN>LL%W%j%s%H4pHW$K4X$9$k(B PostScript $B?^$r7G:\$7$F$$$^$9(B
$B$,!"4pHW<+BN$O<+J,$G:n$i$J$1$l$P$J$j$^$;$s(B ($B$b$7$/$O!":n$C$F$/$l$k?M$r(B
$BC5$9I,MW$,$"$j$^$9(B)$B!#(B</P
><P
><TT
CLASS="FILENAME"
>ntpd</TT
> $B$K$O(B CHU $B%l%7!<%PMQ$N%I%i%$%P(B (type 7) $B$,4^$^$l$F(B
$B$$$^$9!#$3$l$O!V(BGadget Box$B!W$N$h$&$J%b%G%`$r;H$&$+!"$b$7$/$O(B Sun
SPARCstation ($B$"$k$$$O$=$N8_49%*!<%G%#%*%I%i%$%P$r;}$C$?%^%7%s(B) $B$N%^%$%/(B
$BF~NO$KD>@\2;@<$rF~NO$9$k$3$H$GF0$/$h$&$K$J$C$F$$$^$9!#(B</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN275"
>4.2. WWV $B$H!V(BMost Accurate Clock$B!W(B</A
></H2
><P
>Heathkit $B<R$N!V(BMost Accurate Clock$B!W$H$$$&$N$rJ9$$$?$3$H$,$"$kJ}$b$$$k(B
$B$G$7$g$&!#$3$l$O(B WWV $B$N;~Js$r<u?.$7$F%G%3!<%I$7!"%*%W%7%g%s$N%7%j%"%k%]!<%H(B
$B$r;H$C$F%3%s%T%e!<%?$K@\B3$9$k$H$$$&$b$N$G$9!#(BHeathkit $B$O?oJ,$^$($K(B
$B$3$N%-%C%H$NHNGd$r;_$a$F$7$^$$$^$7$?$,!"(B1995$BG/$^$G$O$3$N;~7W$N40@.IJHG$N(B
$BHNGd$rB3$1$F$$$^$7$?(B ($B8=:_$OHNGd$7$F$$$^$;$s(B)$B!#(B($B;~7W0J30$N@=IJ$r(B
$B4^$a$?(B) Heathkit $B<R$X$N%N%9%?%k%8%"$r=q$$$?%Z!<%8$,(B
<A
HREF="http://www.heathkit-museum.com"
TARGET="_top"
>http://www.heathkit-museum.com</A
> $B$K$"$j$^$9!#(BHeathkit $B<R<+BN$O(B
$B:#$b7r:_$G$"$j!"3X=,MQ$N65:`$rHNGd$7$F$$$^$9!#>\$7$/$O(B
<A
HREF="http://www.heathkit.com"
TARGET="_top"
>http://www.heathkit.com</A
> $B$r$4Mw$/$@$5$$!#(B</P
><P
>Dave Mills $B$K$h$k$H!"(BHeathkit $B<R$N!V(BMost Accurate Clock$B!W$K4X$9$kFC5v$O(B
$B$b$&$9$04|8B@Z$l$K$J$k$N$G!"$b$7$+$9$k$H$=$N%/%m!<%s$r%7%s%0%k%A%C%W(B IC
$B$H$7$FGd$j=P$92q<R$,=P$F$/$k$+$b$7$l$J$$$=$&$G$9!#(B</P
><P
>NTP $B%&%'%V%5%$%H$K$O(B DSP $B%W%m%0%i%`(B ($B$*$h$S$=$l$r2r@b$7$?(B PDF $B%U%!%$%k(B)
$B$,$"$j$^$9(B <A
HREF="http://www.eecis.udel.edu/~mills/resource.htm"
TARGET="_top"
>http://www.eecis.udel.edu/~mills/resource.htm</A
>$B!#(B $B$3$l$OC;GH%i%8%*$H(B
TAPR/AMSAT DSP-93 $B$H$$$&(B ($B8=:_$G$OHNGd$7$F$$$J$$(B) DSP $B%-%C%H$r;H$C$F(B
WWV $B;~Js$r%G%3!<%I$9$k$b$N$G$9!#$3$N%-%C%H$O(B Texas Instruments $B$N(B
TMS320C25 DSP $B%A%C%W$r%Y!<%9$K$7$?$b$N$G$9!#(BTAPR $B$N%&%'%V%5%$%H(B
<A
HREF="http://www.tapr.org"
TARGET="_top"
>http://www.tapr.org</A
> $B$K$O(B
$B<+<R3+H/$N(B DSP $B%W%m%0%i%`$K4X$9$k>pJs$,K-IY$K$"$j$^$9!#(B</P
><P
><TT
CLASS="LITERAL"
>ntpd</TT
> $B%Q%C%1!<%8$K$O(B IRIG-B $B$H(B IRIG-E $B%?%$%`%3!<%I$N(B
$B%I%i%$%P(B (type 6) $B$b4^$^$l$F$$$^$9!#(B
$B$3$l$O(B Sun SPARCstation $B$N(B <TT
CLASS="FILENAME"
>/dev/audio</TT
>
$B$rMxMQ$9$k$b$N$G$9$,!"$=$l0J30$N%7%9%F%`$K$b0\?"$,2DG=$@$=$&$G$9!#(B
WWV $B$G$O(B IRIG-H $B%?%$%`%3!<%I$,;H$o$l$F$$$^$9!#(B</P
><P
>WWV $B$O(B NIST $B$K$h$j1?1D$5$l$F$*$j!"%&%'%V%5%$%H$O(B
<A
HREF="http://www.boulder.nist.gov/timefreq/index.html"
TARGET="_top"
>http://www.boulder.nist.gov/timefreq/index.html</A
> $B$G$9!#(B
$B$3$N%5%$%H$K$O(B "Special Publication 432" $B$H$$$&J8=q$,$"$j!"$3$l$K$O(B
$B;~4V$H<~GH?t$K$D$$$F$N5-=R$,$"$j$^$9!#(B
<A
HREF="http://www.boulder.nist.gov/timefreq/pubs/sp432/sp432.htm"
TARGET="_top"
>http://www.boulder.nist.gov/timefreq/pubs/sp432/sp432.htm</A
>.
WWV $B$O(B 2.5, 5, 10, 15, 20 MHz $B$GJ|Aw$7$F$$$^$9!#(B</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN290"
>4.3. GPS $B$H!V(BTotally Accurate Clock$B!W(B</A
></H2
><P
>GPS $B?.9f$K$O@53N$J;~4V$b4^$^$l$F$$$F!"(BGPS $B%l%7!<%P$N$J$+$K$O%7%j%"%k(B
$B%]!<%H$rHw$($?$b$N$,$"$j$^$9!#(Bntpd $B$K$O3F<o(B GPS $B%l%7!<%PMQ$N%I%i%$%P$,(B
$BF1:-$5$l$F$$$^$9!#(B1PPS $B5!G=(B ("One Pulse Per Second", $B$3$l$O$+$J$j9b@:EY(B
$B$rMW$9$k>l9g$K;H$o$l$k$b$N$G$9(B) $B$O!"DL>oFCJL$J%$%s%?!<%U%'%$%9$r;H$C$F(B
$B%3%s%T%e!<%?$K7R$0I,MW$,$"$j$^$9!#(B</P
><P
>TAPR (Tuscon Amateur Packet Radio) $B$K$O(B TAC-2 ("Totally Accurate Clock" $B$N(B
$BN,(B) $B$H$$$&%$%s%?!<%U%'%$%9MQ$N%-%C%H$,$"$j$^$9!#$3$l$O%7%j%"%k%]!<%H$K(B
$B:9$79~$s$G(B GPS $B%l%7!<%P$H7R$0$?$a$N%$%s%?!<%U%'%$%9$G$"$j!"(B1PPS $B$N=PNO$r(B
$B$b$D(B GPS $B%l%7!<%P$J$i$I$s$J$b$N$G$b;H$($^$9!#$^$?$3$l$K$O2sO)4pHW$K(B
$BD>@\:\$;$k$3$H$,$G$-$k%Y%"%\!<%I%b%G%k(B (bare board model) $B$b$"$j$^$9!#(B
$B>\$7$/$O(B <A
HREF="http://www.tapr.org/"
TARGET="_top"
>http://www.tapr.org/</A
> $B$N%&%'%V%5%$%H$r$4Mw$/$@$5$$!#(B(1999$BG/(B6$B7n;~E@$G$N(B)
$BCMCJ$O!"(BGPS $B%l%7!<%PH4$-$G(B 140 $B%I%kA08e$G$9!#$3$N%-%C%H$K$Oc~BN$d2sO)4pHW(B
$B<h$jIU$1MQ$NItIJ$O4^$^$l$F$$$^$;$s!#(B</P
><P
>($BJL$N>O$G=R$Y$?(B) CHU $B!V(BGadget Box$B!W(B $B$b(B 1PPS $B?.9f$N%$%s%?!<%U%'%$%9$H$7$F(B
$B;H$&$3$H$,$G$-$^$9!#(BNTP $B%&%'%V%5%$%H$K$O$3$l$K4X$9$k@bL@$,5-:\$5$l$F(B
$B$$$^$9(B <A
HREF="http://www.eecis.udel.edu/~ntp/ntp_spool/html/pps.htm"
TARGET="_top"
>http://www.eecis.udel.edu/~ntp/ntp_spool/html/pps.htm</A
>$B!#(B</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN297"
>4.4. $BD9GH%?%$%`%7%0%J%k!'(B DCF77, MSF(Rugby), WWVB</A
></H2
><P
>$BD9GHJ|Aw6I$G$O!"%-%c%j%"$N%*%s!&%*%U@Z$jBX$($K(B
$B$h$C$F%?%$%`%7%0%J%k$rJ|Aw$7$F$$$^$9!#J|Aw6I$4$H$KFH<+$N(B
$B%3!<%IJ}<0$r;H$C$F$*$j!"$=$N35MW$O(B NTP $B%&%'%V%5%$%H$K7G:\(B
$B$5$l$F$$$^$9!#(B<A
HREF="http://www.eecis.udel.edu/~mills/ntp/index.htm"
TARGET="_top"
>http://www.eecis.udel.edu/~mills/ntp/index.htm</A
> ($B$3$N%Z!<%8$N(B
$B:G8e$N$[$&$G$9(B)$B!#%I%$%D$N(B DCF77 $B$G$O(B 77.5kHz$B!"%$%.%j%9$N(B MSF ($B$3$3$O(B
$B=j:_CO$K$A$J$s$G(B "Rugby" $B$H$b8F$P$l$F$$$^$9(B) $B$H%3%m%i%I$N(B WWVB $B$O(B
$B$I$A$i$b(B 60 kHz $B$GJ|Aw$5$l$F$$$^$9!#(B</P
><P
>WWVB $B$N<u?.46EY$O0lDj$7$F$$$^$;$s$,!"J|Aw=PNO$rCJ3,E*$K>e$2$h$&$H$$$&7W2h$,(B
$B$"$j$^$9!#$=$N?JD=>u67$K$D$$$F$O(B NIST $B$N%&%'%V%5%$%H$r$4Mw$/$@$5$$(B
<A
HREF="http://www.boulder.nist.gov/timefreq/wwvstatus.html"
TARGET="_top"
>http://www.boulder.nist.gov/timefreq/wwvstatus.html</A
> $B!#(B</P
><P
>$B%7%j%"%k%]!<%H$K@\B3$G$-$k0B2A$J%l%7!<%P$,%h!<%m%C%Q$GF~<j2DG=$@$=$&$G$9!#(B
<TT
CLASS="LITERAL"
>ntpd</TT
> $B$K$O$$$/$D$+$N(B MSF $B%l%7!<%PMQ$N%I%i%$%P$,4^$^$l$F(B
$B$$$^$9!#(B</P
><P
>$B9g=09q$NB?$/$N2q<R$,(B WWVB $B%l%7!<%P$rAH$_9~$s$@Hf3SE*0B2A$J;~7W$r(B
$BHNGd$7$F$$$^$9(B ($B$3$l$K$OJI3]$1MQ$N;~7W$b$$$/$D$+4^$^$l$F$$$^$9(B)$B!#(B
$B$7$+$7!"Cx<T$NCN$k8B$j!"%3%s%T%e!<%?$K@\B3$G$-$k$N$O(B 2 $B5!<o$7$+(B
$B$"$j$^$;$s!#(B</P
><P
>Ultralink Model 320 $B$H$$$&;~7W$O(B (1999$BG/(B6$B7n;~E@$G(B) 120 $B%I%kDxEY$G$9$,!"(B
$B$3$l$O%7%j%"%k%$%s%?!<%U%'%$%9$H(B ASCII $BJ8;z$K$h$k%3%^%s%I(B
$B%;%C%H$,;H$($k$h$&$K$J$C$F$$$^$9!#$=$l$f$(!"%W%m%0%i%`$r:n$k$N$O(B
$B$=$l$[$IFq$7$/$J$$$O$:$G$9!#$3$l$O%7%j%"%k%]!<%H$+$i(B 1 mA $B$NEE8;$r(B
$B<h$j$^$9!#%"%s%F%J$O%3%s%T%e!<%?$+$i(B 100 $B%U%#!<%H$^$GN%$9$3$H$,$G$-!"(B
$B%7%0%J%k$,F@$i$l$J$$>l9g$KHw$($FAH$_9~$_$NFbB"%/%m%C%/$G;~4V$rB,Dj$7(B
$BB3$1$k$3$H$,$G$-$^$9!#(BUltralink $B$G$O%Y%"%\!<%sHG$b(B 80 $B%I%kDxEY$G(B
$BHNGd$7$F$$$^$9!#$3$l$O(B "BASIC Stamp" $B%7%j!<%:$N%^%$%/%m%3%s%H%m!<%i$G(B
$BF0$/$h$&$K@_7W$5$l$F$$$^$9!#>\$7$/$O<!$N%&%'%V%Z!<%8$r$4Mw$/$@$5$$!#(B
<A
HREF="http://www.ulio.com/timepr.html"
TARGET="_top"
>http://www.ulio.com/timepr.html</A
>.</P
><P
>Arcron Technology $B$O!"%7%j%"%k%]!<%H$r%*%W%7%g%sAuHw$7$?Bn>e;~7W$rLs(B 80 $B%I%k(B
$B$GHNGd$7$F$$$^$9!#$3$l$K$O(B Windows $BMQ$N%=%U%H%&%'%"$b4^$^$l$F$$$^$9!#(B
$B>\$7$/$O<!$N%&%'%V%Z!<%8$r$4Mw$/$@$5$$!#(B
<A
HREF="http://www.arctime.com"
TARGET="_top"
>http://www.arctime.com</A
>.</P
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