Dear Valued Customer, the hardware layout of the reference design in this ZIP file is designed for both 315MHZ and 433MHz operation. The only difference between the two designs is the component values related to the RF layout. If you are making a 315MHz design, please use the following bill of material (BOM) for optimum RF performance: BOM CC1101EM 315MHz Reference Design C_100N_0402_X5R_K_10 C41 C_100N_0402_X5R_K_10 C51 C_10N_0402_X7R_K_25 C111 C_10N_0402_X7R_K_25 C91 C_10N_0402_X7R_K_25 C141 C_12P_0402_NP0_J_50 C122 C_1U_0805_X7R_K_16 C1 C_220P_0402_NP0_J_50 C181 C_220P_0402_NP0_J_50 C125 C_220P_0402_NP0_J_50 C151 C_220P_0402_NP0_J_50 C124 C_27P_0402_NP0_J_50 C81 C_27P_0402_NP0_J_50 C101 C_6P8_0402_NP0_J_50 C121 C_6P8_0402_NP0_J_50 C123 C_6P8_0402_NP0_J_50 C131 CC1100 U1 L_18N_0402_J L122 L_33N_0402_J L131 L_33N_0402_J L123 L_33N_0402_J L121 L_BEAD_102_0402 L1 R_56K_0402_F R171 SMA_SMD P3 SMD_SOCKET_2x10 P2 SMD_SOCKET_2x10 P1 X_26.000/10/10/10/16 X1