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no position

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Phil_anthropist View Drop Down
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    Posted: 17 Feb 2024 at 5:54pm
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




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rpostmo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rpostmo Quote  Post ReplyReply Direct Link To This Post Posted: 17 Feb 2024 at 8:21pm
I installed my 540 in  2015.  I've never seen that message.
Bob
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rolfe_tessem Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2024 at 10:23am
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil_anthropist Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2024 at 2:13pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil_anthropist Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2024 at 2:46pm
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?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote eallevato Quote  Post ReplyReply Direct Link To This Post Posted: 19 Feb 2024 at 2:06am
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
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil_anthropist Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 2024 at 8:16pm
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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Post Options Post Options   Thanks (1) Thanks(1)   Quote Phil_anthropist Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jul 2024 at 7:34pm
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.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote MysticCobra Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jul 2024 at 3:00pm
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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