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GPS-ABC a device designed to support the visual observer by Tony Barry and Dave Gault Presented to International Occultation Timing Association 2012 AGM.

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Presentation on theme: "GPS-ABC a device designed to support the visual observer by Tony Barry and Dave Gault Presented to International Occultation Timing Association 2012 AGM."— Presentation transcript:

1 GPS-ABC a device designed to support the visual observer by Tony Barry and Dave Gault Presented to International Occultation Timing Association 2012 AGM Friday, 19 th October 2012 (US) Saturday, 20 th October 2012 (AU)

2 Remember the The-Good-Old-Days… When visual observations were King. All an observer would need were… A simple telescope A shortwave radio (or two) tuned to WWV, WWVH, CHU, or in Australia, VNG time broadcast A cassette tape recorder (or two) And a loud voice to make call from the telescope when the event(s) occurred. Thousands of historical observations were made using this method… Observer Hal Povenmire

3 … And still are. The Great (90) Antiope Occultation 2011, July 19th

4 Now video observations are King… Some blokes have huge visual scopes and dont want to climb the video learning curve They can make valid observations if good time-base is available…

5 time-bases for visual observations Closed in 2002 enter… GPS-ABC

6 The coded beep of GPS-ABC every second= normal beep beginning of the minute = long beep 10th, 20th, 30th, 40th and 50th seconds= short beep 55th, 56th. 57th and 58th second= brief beep 59th second = silent (no beep) GPS-ABC has a clear and static free coded time-beep Click to hear GPS-ABC and John Vetter in action Or goto YouTube -

7 GPS-ABC built on the IOTA-VTI pedigree IOTA-VTI P#4 GPS-ABC P#5

8 How to procure a GPS-ABC?

9 GPS-ABC an open-source device

10 Hand Wired Home Assembly with or without Hardware Help The cheapest method to procure a GPS-ABC is the hand-wired option because you do all the purchasing and work. About $113 worth of components and about 6 to 8 hours work. Hardware Help… Metal Chassis$12.50 Modified Case to suit$35.00

11 GPS-ABC #8 by Chris Chad

12 Printed Circuit Board Home Assembly or Ready-to-Go Option 2a; Home Assembly - owner purchases the three major components and a KIT-of-Parts - about an hours work with basic tools and a soldering iron… ……… Cost about $199 Option2B; Purchased Fully Assembled, Tested, and Ready-to-Go …………….. Price $249

13 Questions…? For more info, see


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