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[aprssig] 434 MHz tracker

Andrew Rich vk4tec at tech-software.net
Fri Dec 19 20:04:46 UTC 2008

He hijacked my post !

Sorry Bob, you are full of good ideas.

I have been doing alot of work with RADAR lately - they use Pulse Position Mod at 4MB


  ----- Original Message ----- 
  From: Robert Bruninga 
  To: 'TAPR APRS Mailing List' 
  Sent: Saturday, December 20, 2008 3:38 AM
  Subject: Re: [aprssig] 434 MHz tracker

  > I revisited an old project tonight.
  > 434 MHz TX and GPS, easy radio module.
  > Sending: 
  > VK4TEC-12>APRS,WIDE: <<UI>>:=2734.45S/15306.21E'SATS 03
  > RAW,27344551,S,153062152,E
  > Takes 76 ms on busy pin, or 44 ms of actual data.
  > The down side is the power out is only low, mW

  Actually that is perfect!  And all you need to send is:


  Which drops it to 4ms of data.  AND then the RECEIVING device
  which is located at the door of the clubhouse, EOC, ham radio
  store, local bar, church, jail and everywhere else in town where
  hams might be found adds the following info:

  SYMBOL for RFID tag
  Local RF Voice Channel at that location
  Comments about that location

  And then sends that packet out on the APRS channel like this:

  VK4TEC-12>APRS,WIDE1-1:=2734.45S/15306.21E'147.105MHz AARC Radio

  But the hundredths digit of LATITUDE is randomized so that
  everyone at that location will appear as a list at that location
  and not all on top of each other.

  Please see the APRS RFID web page:

  Put this in a Key Fob and all a Ham has to do  is push a button
  and he instantly is seen globally, whwere he is, what he is
  doing, and what frquency to contact him on.

  Go for it!
  Bob, Wb4APR

  aprssig mailing list
  aprssig at tapr.org


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