Could be just about anything.  If you have re-positioned your GPS antennae,
I'd move them back.  I'd also check the connections on the antennae and see
that they are snug and fitting properly and weren't pulled out of place when
you were working on the nearby screen.  If they are snug, I'd even go to the
extent of trying a new antenna and mounting it high up (temporarily for
testing) in the canopy to see if the problem disappears.

By the way, GPS interference tests do occur.  The East Coast has one
planned.  You may want to see if there is a GPS notam in your area (or was).
https://www.faasafety.gov/files/notices/2011/Nov/CSFTL_11-06_GPS_Flight_Advi
sory.pdf  


Good luck!


David Powell CRFA
superdmp@sonic.net
(386) 868-5858
 

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Dr.
Weinsweig
Sent: Wednesday, November 30, 2011 6:23 AM
To: lml@lancaironline.net
Subject: [LML] cheltons losing gps signal

hi all,  

since installing an overdue software update to my cheltons as well as
sending out 1 screen to be "overhauled" by cobham (both of which may be
totally incidental), my cheltons lose gps signal intermittently usually
about 10-15 minutes into the flight then about half an hour later regain the
gps signal though there doesn't seem to be a lot of rhyme or reason behind
when/where the signal is lost or reappears.  the ahrs works fine and it
tries to calculate where i am on the moving map but not accurately enough.  

i have tried calling cobham tech support but have been unable to get my
calls returned which is unusual as in the past they have been responsive.

any great ideas on where to troubleshoot or has anyone else had this issue
before?  is it the antennae/receiver?

thanks,

david weinsweig
304-633-5221
weinsweigd@gmail.com
n750dw propjet still for sale with a lower price(asking 475k or will take a
5+place on partial trade)


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