View Single Post
  #46   Spotlight this post!  
Unread 02-04-2012, 19:51
rbtying rbtying is offline
Team 846 Chief Software
AKA: Robert Ying
FRC #0846 (Funky Monkeys)
Team Role: Programmer
 
Join Date: Jan 2012
Rookie Year: 2011
Location: San Jose, CA
Posts: 9
rbtying is an unknown quantity at this point
Re: Intermittent connection on field only

Team 846 had similar problems at New York Regional, which were resolved by swapping the power distribution board. Though it will not pass inspection, you can try mounting a spare PDB as a custom circuit off of one of the 40A breaker slots, and powering the radio off of that.

We will likely have more data on this phenomena later, as we plan to scope out the failed power distribution board under load. It is perhaps notable that we have measured large ripple voltages (up to 0.6v on a WORKING board) on the 5v supply output, and that this is likely a marginal condition for the D-Link, which expects 5v +/- 5%.