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CC1125 needs at least 4 bit preamble to settle the AGC. If you have a 30 bit sync word and no sync I would program the chip to 16 or 24 bit sync and let the chip settle the AGC on the first bits of the sync word.
From what I could find POSSAG uses a 572 bit long preamble.
If you actually have no preamble and only 8 bit sync you have to use synchronous serial more.
Hi
I'm working with CC1101 to receive POCSAG messages (f=452.6MHz, Baud=1200, Ch=25KHz, Dev=4.5KHz).
CC1101 is configured with 2-FSK, FREQ=452.599792MHz, CHANSPC=25.39KHz, DRATE=1.19948kBaud, DEVIATN=4.364KHz, CHANBW=58KHz, FREQ_IF=457KHz.
RX FIFO and Important Status registers are polled at nearly 4-times the baud rate and sent to a serial port on a PC. During the whole packet reception, RX FIFO=0xFF, FREQEST=0x09, LQI=0x80, RSSI~0xE2.
What's the problem with the data? Which configuration is wrong?
Thank you in advance