Fri_coder,
I looked thru some of the parameters in your setup and it looks like you started with a FSK settings and made some changes to get to ASK.
I recommend starting with the ASK settings in SmartRF Studio and then working from there.
Please take try the settings below.
Thomas
IOCFG2, 0x29
IOCFG1, 0x2E
IOCFG0, 0x06
FIFOTHR, 0x47
SYNC1, 0xD3
SYNC0, 0x91
PKTLEN, 0xFF
PKTCTRL1, 0x04
PKTCTRL0, 0x05
ADDR, 0x00
CHANNR, 0x00
FSCTRL1, 0x06
FSCTRL0, 0x00
FREQ2, 0x21
FREQ1, 0x62
FREQ0, 0x76
MDMCFG4, 0xF5
MDMCFG3, 0x83
MDMCFG2, 0x33
MDMCFG1, 0x22
MDMCFG0, 0xF8
DEVIATN, 0x15
MCSM2, 0x07
MCSM1, 0x30
MCSM0, 0x18
FOCCFG, 0x14
BSCFG, 0x6C
AGCCTRL2, 0x03
AGCCTRL1, 0x40
AGCCTRL0, 0x92
WOREVT1, 0x87
WOREVT0, 0x6B
WORCTRL, 0xFB
FREND1, 0x56
FREND0, 0x11
FSCAL3, 0xE9
FSCAL2, 0x2A
FSCAL1, 0x00
FSCAL0, 0x1F
RCCTRL1, 0x41
RCCTRL0, 0x00
FSTEST, 0x59
PTEST, 0x7F
AGCTEST, 0x3F
TEST2, 0x81
TEST1, 0x35
TEST0, 0x09
PARTNUM, 0x00
VERSION, 0x04
FREQEST, 0x00
LQI, 0x00
RSSI, 0x00
MARCSTATE, 0x00
WORTIME1, 0x00
WORTIME0, 0x00
PKTSTATUS, 0x00
VCO_VC_DAC, 0x00
TXBYTES, 0x00
RXBYTES, 0x00
RCCTRL1_STATUS, 0x00
RCCTRL0_STATUS, 0x00