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Sounds like you have some serious radio interference at your field. Lockout wasn't the cause of your crashes, it was the symptom. If you had a PPM system, who knows what would have happened - but you still would have lost control.
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Perhaps you need to look at the DX7 system that is on 2.4 GHz. . . . Another option for 72Mhz is the Berg or FMA receivers with digital signal processing. I know the FMA system has IR sensors that will level your wings and nose if it loses signal and goes into failsafe.
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