hi good day to you Sir, i would like to ask help from you. i want to know how to operate RT130and RT1120. i would like you to help me to calibrate and extend the boom extension using mode 1-2-3, Auto A-B-C and Boom overide key switch. my problem is, i want to calibrate the boom but the boom will not extend. this is my first time to calibrate RT130 and RT1120. normally, i work only with RT500-1, RT670, RT780 and RT230. Los saludos,