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#31
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|GG| Dpreview wants to cater to the simple people
On Wed, 17 Dec 2008 22:01:53 +0200, "Tzortzakakis Dimitrios"
wrote in : Ο "HEMI-Powered" έγραψε στο μήνυμα . .. To have set the clock automatically would have required a computer, or a more capable computer, than the early VCRs had OR some means of communicating with a cable or satellite system to actually pick up the time. In Europe, there is such a system. From a central long wave transmitter, in Frankfurt/Main (germany) the time is being transmitted. I have a "weather station" with such a clock, even in Crete I can receive the signal and the clock shows (usually) the correct time There is such a system here too, but radio clocks only became affordable more recently, and have their own issues (signal strength, time zone). http://en.wikipedia.org/wiki/WWV_(radio_station) -- Best regards, John [Please Note: Ads belong *only* in rec.photo.marketplace.digital, as per http://bobatkins.photo.net/info/charter.htm http://rpdfaq.50megs.com/] |
#32
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|GG| Dpreview wants to cater to the simple people
Tzortzakakis Dimitrios wrote:
Ο "HEMI-Powered" έγραψε στο μήνυμα ... John Navas added these comments in the current discussion du jour ... But tell me this, Jerry: why is it that kids have the reputation of being able to operate all these gadgets? Unlike us they don't have better things to do with their time than read arcane manuals? See my longer reply to David on this, John. You are certainly right, though. If young people can't find it on the Web they aren't interested in it. Try and get a young person to actually sit down and read ANY book! The video recorder flashing 12:00 used to be the classic example. The clock can now be set automatically, which should have been done from the beginning. To have set the clock automatically would have required a computer, or a more capable computer, than the early VCRs had OR some means of communicating with a cable or satellite system to actually pick up the time. In Europe, there is such a system. From a central long wave transmitter, in Frankfurt/Main (germany) the time is being transmitted. I have a "weather station" with such a clock, even in Crete I can receive the signal and the clock shows (usually) the correct time The US has had time signals from the Bureau of Standards (now "NIST") station WWV available since 1923. The first edition of the Radio Amateur's Handbook I ever saw told how to use those signals to obtain a frequency reference. For some reason (possibly the difficulty of effective testing when the signals were not available in Japan, and possibly the need for an additional receiver) the Japanese decided not to make use of them. Clocks which use those signals are readily available in the US--I have a Casio watch that charges itself off of any available light and sets itself by the time signals, and an alarm clock and a couple of wall clocks that all use the signals. Most such devices sold in the US are using the signals from WWVB, though, which transmits on higher frequencies and which went online in 1956 with major power boost in 1999 (which it needed badly to cover the whole country). Of course there is also worldwide coverage now using the GPS satellites. Current US VCRs though set their clocks using a signal transmitted by PBS stations on the broadcast television bands and so have no need for a separate receiver. This system works well when they are connected to an OTA antenna and less well if they are connected only to cable. Our current age is such that few under 30 can even imagine what it was like to play with the first Betamax and some can't even fathom the first commercial digital cameras, and NONE have any clue what an Apple ][ or Imsai 8080 was! -- -- -- --John to email, dial "usenet" and validate (was jclarke at eye bee em dot net) |
#33
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|GG| Dpreview wants to cater to the simple people
On Wed, 17 Dec 2008 16:46:34 -0500, "J. Clarke"
wrote in : The US has had time signals from the Bureau of Standards (now "NIST") station WWV available since 1923. The first edition of the Radio Amateur's Handbook I ever saw told how to use those signals to obtain a frequency reference. For some reason (possibly the difficulty of effective testing when the signals were not available in Japan, and possibly the need for an additional receiver) the Japanese decided not to make use of them. Clocks which use those signals are readily available in the US--I have a Casio watch that charges itself off of any available light and sets itself by the time signals, and an alarm clock and a couple of wall clocks that all use the signals. Most such devices sold in the US are using the signals from WWVB, though, which transmits on higher frequencies and which went online in 1956 with major power boost in 1999 (which it needed badly to cover the whole country). WWVB is actually lower frequency, 60 kHz. WWV is on 2.5 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz. WWVH is on the same frequencies, except for 20 MHz. http://tf.nist.gov/timefreq/stations/wwvb.htm WWVL, broadcast from 1963-1972, was even lower than WWVB, 20 kHz. Discontinuance of WWVL facilitated the higher power of WWVB. -- Best regards, John [Please Note: Ads belong *only* in rec.photo.marketplace.digital, as per http://bobatkins.photo.net/info/charter.htm http://rpdfaq.50megs.com/] |
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