I've been experiencing occasional dropouts on 129. My signal readings are 63 on 119 and 64 on 110, however on 129 I'm down to 44. I noticed that if I switch the transponder from 30 to 31, the signal goes to 46 and if I switch to 32 it goes to 55. The default is 30, is there a way to change to transponder 32? Excuse my ignorance. Thanks!