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)