Here we go again.
Most modern transponders do not require you to go to standby when changing code.
There was a lengthy discusion about this a couple of months back, I'm not going to reiterate it. Do a search.
http://www.pprune.org/ubb/NonCGI/For...ML/000274.html
CPB
[This message has been edited by Capt Pit Bull (edited 04 August 2000).]