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[aprssig] APRS tone encode question

Andrew Rich vk4tec at tech-software.net
Wed Aug 25 05:32:30 UTC 2004


what is phase continuous ?


  -----Original Message-----
  From: Scott Miller [mailto:scott at 3xf.com]
  Sent: Tuesday, 24 August 2004 11:41 PM
  To: vk4tec at tech-software.net; 'TAPR APRS Mailing List'
  Subject: RE: [aprssig] APRS tone encode question


  No, it requires that the phase be continuous.  Since 2200 isn't an even
multiple of 1200 baud it wouldn't come out even anyway.  In the OpenTracker,
a pointer to the current sine value is incremented each step.  The size of
the increment depends on which tone is being sent at the moment.

  Scott
  N1VG
    -----Original Message-----
    From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Andrew Rich
    Sent: Tuesday, August 24, 2004 1:58 AM
    To: TAPR APRS Mailing List
    Subject: RE: [aprssig] APRS tone encode question


    Does Packet require the tone shift from 1200 to 2200 to occur at a zero
crossing ?

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