Other Parts Discussed in Thread: CC430F5133, CC1101, CC1350
I am migrating an existing product from the CC430F5133 to the CC1310. I am having receive issues when I transmit from the CC30 to the CC1310.
I am using transmitting using RFStudio connected to my current board with the CC430. I am receiving with the CC1310 Launchpad.
The settings are as follows:
Carrier Frequency: 911.99755MHz
Symbol Rate: 2.4 kBaud
Modulation: 2-FSK
Deviation: 5KHz
RX Filter Bandwidth: 59KHz on CC1310
TX Power: 0dBm, Distance between units = 1 meter.
In the CC1310 Technical Reference Manual on pg. 1705, it states that "The bit polarity for FSK modulation is given by bBitReversal, which must be 1 for compatibility with the CC1101". If I set it to a 1 like it says in the manual, the units will not communicate at all. If I set it to a 0, I can get communication between the 2 units depending on the carrier frequency that I set for the CC1310. What must the setting be for compatibility with the CC430F5133?
I measured the CW frequency of the CC430 board and it was 911.9752MHz. I measured the CW frequency of the CC1310 Launchpad and it was 911.9978MHz. With the RX Filter Bandwidth of the CC1310 set to 59kHz, I am not able to receive any packets with the CC1310. Why can't the CC1310 receive packets from the CC430 if the carrier frequencies are only separated by 22.6kHz and the deviation is 5kHz?
I gradually reduced the carrier frequency setting of the CC1310 from the nominal frequency of 911.99755MHz until I was able to receive 100% of the packets sent by the CC430. The upper frequency of this range was 911.98517MHz and the lower frequency was 911.97032MHz. At these 2 frequencies, I could receive 100% of the packets sent by the CC430 but the RSSI was 6 dB lower than the RSSI at the center of the band. This corresponds to a RX bandwidth of only 28.5kHz. Why is the RX bandwidth so low if it is set to 59kHz?
I am concerned that I may not be able to communicate with our existing units over time and temperature even if I set the carrier frequency on the CC1310 to a value close to the actual frequency that we have been using. Are there any other parameters that I can adjust on the CC1310 to ensure compatibility with our existing CC430 units?
Thanks!
