All,
I am having problems with an RF tracking beacon designed around the CC115L. I am comparing the device against a 'golden product' based on a CC1070 set to 10dBm @ 434.050Mhz. The beacon just needs to transmit a slowly pulsed carrier wave.
I receieve the following results with the spectrum analyser.
The purple trace is from the golden product based on a CC1070. The green from my CC115L board. I have used a Johanson Technology 0433BM15A0001 balun and filter to reduce size and component count, see attached schematic. The antenna on both products is a 16.4cm wire. The gound plane on both products are similar in size. The board is being run from a 3.3v supply, not 1.8v as shown in the schematic.
0167.CC115L-Dev - Schematic.pdf
Actual PCB:
I have used the following register settings:
#define CC115L_IOCFG2_DEFAULT 0x2E
#define CC115L_IOCFG1_DEFAULT 0x0B
#define CC115L_IOCFG0_DEFAULT 0x2E
#define CC115L_FIFOTHR_DEFAULT 0x47
#define CC115L_PKTCTRL0_DEFAULT 0x32
#define CC115L_FREQ2_DEFAULT 0x10
#define CC115L_FREQ1_DEFAULT 0xB1
#define CC115L_FREQ0_DEFAULT 0xB9
#define CC115L_MDMCFG4_DEFAULT 0xF5
#define CC115L_MDMCFG3_DEFAULT 0x83
#define CC115L_MDMCFG2_DEFAULT 0x30
#define CC115L_MDMCFG1_DEFAULT 0x22
#define CC115L_MDMCFG0_DEFAULT 0xF8
#define CC115L_DEVIATN_DEFAULT 0x00
#define CC115L_MCSM1_DEFAULT 0x30
#define CC115L_MCSM0_DEFAULT 0x18
#define CC115L_RESERVED_0x20_DEFAULT 0xFB
#define CC115L_FREND0_DEFAULT 0x11
#define CC115L_FSCAL3_DEFAULT 0xE9
#define CC115L_FSCAL2_DEFAULT 0x2A
#define CC115L_FSCAL1_DEFAULT 0x00
#define CC115L_FSCAL0_DEFAULT 0x1F
#define CC115L_TEST2_DEFAULT 0x81
#define CC115L_TEST1_DEFAULT 0x35
#define CC115L_TEST0_DEFAULT 0x09
#define CC115L_PA_TABLE_DEFAULT {0xC0,0xC0,0x00,0x00,0x00,0x00,0x00,0x00}
I have tried many permutations without any success, any pointers would be greatfully received.
Arran
