> > You can try a free program called "Dimension 4", which you can download > > at http://www.thinkman.com/dimension4/index.html No special hardware > > needed, just a dial up connection! > > I use Dimension 4; works very well at home & at work. > I looked at its web site - it's the first of several I looked at that promises 0.1 second accuracy or better over the web. Others have stated that even with two-way communication, the www delay cannot be accurately measured, since it may be different for send/receive. I have a (cheap) radio clock receiving Frankfurt, Germany. It seems reliable, but it has always been off by 0.6 to 1.2 seconds from the new Swedish telephone speaking clock, which claims 0.01 (or 0.001) s accuracy. We used to have a public service on dial-up (direct modem-to-modem) connection, which DID measure round trip time, adjusted the PC clock to 1/18 s , and kept a log of all adjustments made. It was converted to a private service at about $0.65 per call, and I don't know if it still operates. There is a program which does low-level (BIOS?) adjustments to keep the PC clock accurate for days after a synchronization, available at SeeSat or Clifford's or McCants' or ... ( RighTime, AccuRite, KeepTime ...?) -- bjorn.gimle@tietotech.se (office) -- -- b_gimle@algonet.se (home) http://www.algonet.se/~b_gimle -- -- COSPAR 5919, MALMA, 59.2576 N, 18.6172 E, 23 m -- -- COSPAR 5918, HAMMARBY, 59.2985 N, 18.1045 E, 44 m -- ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Wed Jan 17 2001 - 11:15:17 PST