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Daniel Contarino
02/13/12 17:44
Modified:
  02/13/12 18:57

Read: 213 times
Quilmes
Argentina


 
#185914 - Yes, There is AM!
Responding to: Neil Kurzman's previous message
From http://www.nist.gov/pml/div688/grp40/wwvb.cfm
The carrier power is reduced and restored to produce the time code bits. The carrier power is reduced by 17 dB at the start of each second, so that the leading edge of every negative going pulse is on time. Full power is restored 0.2 s later for a binary 0, 0.5 s later for a binary 1, or 0.8 s later to convey a position marker. The binary coded decimal (BCD) format is used so that binary digits are combined to represent decimal numbers.

Anyway, I think that, probably and without too much analysis, a dedicated hardware is easier to manage than ADC and all the software needed, only to detect 17 dB of signal strength change (a lot, by the way).

Daniel

List of 14 messages in thread
TopicAuthorDate
Help! Doing a WWVB Radio-Synchronized Clock with MCP3004      Armin Kashahyah      02/10/12 12:46      
   Difficult to find resources...      Daniel Contarino      02/10/12 13:46      
      MCP3004 is a Microchip A/D Converter!!      Andy Neil      02/11/12 05:00      
      We use a peak detector to convert signals from the radio...      Armin Kashahyah      02/11/12 14:25      
         RE: I have no idea how to start      Andy Neil      02/11/12 14:58      
      We use a peak detector to convert signals from the radio...      Armin Kashahyah      02/11/12 14:27      
         Why?      Neil Kurzman      02/13/12 14:47      
            Yes, There is AM!      Daniel Contarino      02/13/12 17:44      
               Ok But      Neil Kurzman      02/13/12 22:57      
               Comparator      Per Westermark      02/14/12 05:19      
   Strong Suggestion        Michael Karas      02/10/12 17:54      
      Is it still available?      Andy Neil      02/11/12 04:42      
         Maybe EOL      Michael Karas      02/11/12 07:10      
   Really??!      Andy Neil      02/11/12 04:39      

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