> And, amongst other things, the man who commented on the radiation aspects= makes > satellites !!! :-) And I had this woman as a colleague for a while ... http://www2.physics.ox.ac.uk/contacts/people/aplin Under the Research tab, note the last bullet point ... Now look at this page ... http://en.wikipedia.org/wiki/Snowdon to get the h= eight, and you will see that it is lower than where you are placing your eq= uipment. Others may be correct in that it is electrical problems getting you with br= ownout, but you need to be aware of the cosmic ray problem as well. It may = be doing similar things as the brownout does. --=20 Scanned by iCritical. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .