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Chelton TT DGII VSGV

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dlm34077(at)q.com
Guest

Posted: Sat May 28, 2011 10:05 am Post subject: Chelton TT DGII VSGV

After the latest TT update to fix the  disintegrating display problem, I began to notice Chelton TT AP discrepancies. I  don't use the AP on many short flights so recently have noticed that the AP  always wants to "hunt" right. I have the Digiflite II VSGV on a gang switch  which switches GPS inputs and activates the TT for Arinc A/B inputs. The  selector reads AP standalone with Crossbow GPS input, Chelton Arinc A/B input  with crossbow for GPS, or GPS only from the GRT Sport backup. The main  discrepancy on the display is that the GPS track on the Cheltons (green diamond)  and the GPS track on the GRT Sport (two independent GPSs) agree. Somehow the GPS  track as passed to the AP always displays about 10 degrees "right" of the GPS  track on the Chelton and the Sport. In summary the GPS tracks on the Chelton and  GRT displays agree but the GPS track as shown on the TT AP always shows about 10  degrees right. I believe this causes the AP hunting. Any  thoughts.

   [quote][b]

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Tim Olson

Joined: 25 Jan 2007
Posts: 2881

Posted: Sat May 28, 2011 10:26 am Post subject: Chelton TT DGII VSGV

It's because of where you live....and how you have it wired to the GPS.  The signal you're sending it isn't corrected for magnetic variation the way you have it wired.

Tim





On May 28, 2011, at 1:02 PM, "DLM" <dlm34077(at)q.com (dlm34077(at)q.com)> wrote:



[quote]  After the latest TT update to fix the  disintegrating display problem, I began to notice Chelton TT AP discrepancies. I  don't use the AP on many short flights so recently have noticed that the AP  always wants to "hunt" right. I have the Digiflite II VSGV on a gang switch  which switches GPS inputs and activates the TT for Arinc A/B inputs. The  selector reads AP standalone with Crossbow GPS input, Chelton Arinc A/B input  with crossbow for GPS, or GPS only from the GRT Sport backup. The main  discrepancy on the display is that the GPS track on the Cheltons (green diamond)  and the GPS track on the GRT Sport (two independent GPSs) agree. Somehow the GPS  track as passed to the AP always displays about 10 degrees "right" of the GPS  track on the Chelton and the Sport. In summary the GPS tracks on the Chelton and  GRT displays agree but the GPS track as shown on the TT AP always shows about 10  degrees right. I believe this causes the AP hunting. Any  thoughts.

    	  Quote: 	
		  

	


[b]

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dlm34077(at)q.com
Guest

Posted: Sat May 28, 2011 11:03 am Post subject: Chelton TT DGII VSGV

my understanding is that the GPS track is always  magnetic track. My GRT is set to display  ground track and the Chelton green diamond displays ground track which both  should be magnetic. Yet the GRT display and Chelton green diamond always agree;  just the TT AP display does not agree when Chelton GPS outputs to TT. It may be  user error but I have not found it yet.

  

 ---

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