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[aprssig] PPM APRS

Andrew Rich vk4tec at tech-software.net
Thu Jul 2 05:52:17 UTC 2009


www.tech-software.net

SBS-1


  ----- Original Message ----- 
  From: Jeff King 
  To: TAPR APRS Mailing List 
  Sent: Thursday, July 02, 2009 7:45 AM
  Subject: Re: [aprssig] PPM APRS


  Andrew:

  Do you have any good web links that explain Mode S/ADS-B, the tech specs, formats etc?

  What kind of reciever are you using.

  Thanks

  Jeff  N4864S


  On Wed, Jul 1, 2009 at 5:12 PM, Andrew Rich <vk4tec at tech-software.net> wrote:

    There are heaps of cheap video tx modules around.

    Is there any reason why they can't be PulsePositionModulated ? 

    Should be enough bandwidth 

    I have been looking closely at MODE S aircraft signals - 1 MB at 8MHz bandwidth

    Sounds like a click. Sends position

    Also been looking at AIS - 9600 self organising GMSK. 

    Maybe good ole 1200 baud will be a round for a while.

    I have been using radio modules - 19k2 on air - 100 mW beef up to 30 watts.

    Andrew



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