Loading ...
Sorry, an error occurred while loading the content.

RE: [aprsisce] DF Object

Expand Messages
  • Fred Hillhouse
    Nothing to remember. It already points at the source of the object. This is right. The triangle shaped sector does not narrow down and point towards the DF
    Message 1 of 16 , Apr 4, 2011
    • 0 Attachment
      Nothing to remember. It already points at the source of the object. This is right.
       
      "The triangle shaped sector does not narrow down and point towards the DF object icon to describe the fox location, but rather the DF object icon shows where the report was initiated"
       
      Best regards,
      Fred, N7FMH

      From: aprsisce@yahoogroups.com [mailto:aprsisce@yahoogroups.com] On Behalf Of Lynn W Deffenbaugh (Mr)
      Sent: Monday, April 04, 2011 13:32
      To: aprsisce@yahoogroups.com
      Subject: Re: [aprsisce] DF Object

       

      I'll try to remember that when I finally figure out how to rotate the symbol bitmaps.

      Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

      On 4/4/2011 12:23 PM, Fred Hillhouse wrote:
      I hate these "DOH" moments. Thanks James for pointing me in the right direction!
       
      I liked the 'triangle shaped sector' idea that is pointing to the DF object location.
       
      Best regards,
       
      Fred, N7FMH


      From: aprsisce@yahoogroups.com [mailto:aprsisce@yahoogroups.com] On Behalf Of James Ewen
      Sent: Friday, April 01, 2011 21:08
      To: aprsisce@yahoogroups.com
      Subject: Re: [aprsisce] DF Object

       

      On Fri, Apr 1, 2011 at 1:46 PM, Fred Hillhouse <fmhillhouse@...> wrote:

      > Isn't the DF object (the fox) and DF report object (still the fox) really the same?

      Absolutely not... the fox is your target. The DF vector report is an
      instantaneous heading towards the strongest signal source. The target
      will be a point at some unknown location. Three DF vector reports
      taken at the same time from different locations will all have
      different lat/long values, and different vectors, but all *should*
      point to the target location.

      > At least I see it that way since I am pointing at the fox. Once the fox is found
      > then it becomes an 'object' from a collection of 'DF objects'. We are probably
      > splitting hairs at the moment.

      No, not splitting hares (that would be a bunny hunt!)... it is true
      that we are all pointing at and describing the same target, but arrows
      pointing at the target are not the target. If that were the case,
      driving past a sign on the highway saying "Grande Canyon --->" would
      be the same as actually being at the Grande Canyon.

      > I will agree that '...' is better than '000' for course and speed since '000'
      > implies it is known to be motionless. Once a series of readings are taken,
      > then the calculated course and speed could be added to maybe determine
      > an intercept course for the hunter(s).

      Again, the course and speed reported in the DF object report is the
      course and speed of the DF object (that's the signpost on the side of
      the road), not the course and speed of the target. The DF report is
      simply a direction and quality report, and the object used to describe
      it is required to describe to the remote observer where the measured
      directional and quality report was taken from.

      Are you looking at these reports backwards? The triangle shaped sector
      does not narrow down and point towards the DF object icon to describe
      the fox location, but rather the DF object icon shows where the report
      was initiated, and the directional expands away from there towards the
      direction that the signal was heard from, where if all goes well, the
      fox will be located within.

      James
      VE6SRV


    Your message has been successfully submitted and would be delivered to recipients shortly.