no position
Printed From: Avidyne
Category: Avidyne General
Forum Name: IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM
Forum Description: Topics on Avidyne's IFD 5 Series and IFD 4 Series Touch Screen GPS/NAV/COM
URL: http://forums.avidyne.com/forum_posts.asp?TID=2632
Printed Date: 21 Dec 2024 at 7:10am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com
Topic: no position
Posted By: Phil_anthropist
Subject: no position
Date Posted: 17 Feb 2024 at 5:54pm
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Do others get No Position messages a lot? I have always gotten them and although the 10.3.1.2 software seems to help, I still see them. In this picture, it's happening on the ground though they happen in the air also. I've never had one happen on an approach, but I suppose one day it will. Posts on this topic seem to be mostly around 2015, ex.: http://forums.avidyne.com/gps-failure-even-with-10-1_topic760_post8229.html?KW=gps+fault+no+position#8229 with discussions of ferrite beads etc. Since this 540 is from before then, I wonder if it might suffer from whatever was improved around that time. This tag says REV 02. Does anyone know what hardware rev is current? Regards, PA   |
Replies:
Posted By: rpostmo
Date Posted: 17 Feb 2024 at 8:21pm
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I installed my 540 in 2015. I've never seen that message. Bob
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Posted By: rolfe_tessem
Date Posted: 18 Feb 2024 at 10:23am
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Likewise, I have one of the earliest units in the field and have never seen this. It seems as though most issues like this boil down to the antenna or feedline. Rolfe
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Posted By: Phil_anthropist
Date Posted: 18 Feb 2024 at 2:13pm
Posted By: Phil_anthropist
Date Posted: 18 Feb 2024 at 2:46pm
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Thanks much for the reports! Hmm. I've tried different variations on the antenna and coax. Do either of you know what hardware revision you have, or the manufacture date? Mine I think is week 46 of 2014 from MFG code in the upper picture. Does anyone know how to interpret the logs? Ex. what is TrackingState? CarrierPhaseNoise? |
Posted By: eallevato
Date Posted: 19 Feb 2024 at 2:06am
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Questions: 1) What kind of plane? 2) What is your #2 COM? 3) When you get a “No Position” message in the air, did you happen to notice if it was after transmitting on 121.xx or 131.xx xx MHz on your #2 COM? 4) Do you have a 121.5 MHz ELT? 5) If you have a 121.5 ELT, how far apart is the ELT antenna from the COM antennae? Gene ------------- Gene |
Posted By: Phil_anthropist
Date Posted: 21 Feb 2024 at 8:16pm
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Hi Gene, 1 PA-24 single Comanche 2 Narco 12D+ digital 3 #2 com is never used for transmitting 4 yes, still have a 121.5 ELT 5 about 6 feet PA
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Posted By: Phil_anthropist
Date Posted: 04 Jul 2024 at 7:34pm
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Just a follow-up on this. The unit was returned to Avidyne for repair. The work report says Reason for Return Confirmed. GPS Dropouts, Mods Will Fix R4R. Reason for Return Verified: Complaint Confirmed. Applied Mods 8,15 (R4R). Replaced CF&SD Cards. Applied mods 3-6,8-10,L2-L6,24,28,30. So Mods 8 and 15 must be mods to the GPS board. Lo and behold! For the first time ever, there are no GPS dropouts. Here ye all, Avidyne has stood behind its product and did this work under warranty. |
Posted By: MysticCobra
Date Posted: 05 Jul 2024 at 3:00pm
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Glad you got it sorted! FWIW, I see this message "frequently", but in expected/explained circumstances: For instance, while powered up inside the hangar without a clear view of the sky, or for a minute or two after powerup after being off for a while. Once a GPS fix is achieved, I don't see the message for the rest of the flight.
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