ORIGINAL: GBR2
When you plug into the buddy box connector on the transmitter, it automatically prevents the RF section from operating, so you are not transmitting anything. If your transmitter has a plug in RF module and it makes you feel better, you can also remove that from the transmitter.
GBR2,
I do not believe this is correct. Otherwise, the radio connected to the buddy box could not transmit to the plane. It is safest to just remove the crystal.
Carl