Hi All: I have a .grc 2PSK demodulator working for the RDS subcarriers on FM radio signals. I note however that it takes a couple of minutes for the PSK demod hierarchical block to settle and give me consistent good data.
I tried fiddling with the three timing parameters in the block but lock-up time is only marginally affected. All work fine at default 2*pi/100.0, just that stabilization takes about 2 minutes. I also looked into the code for the hierarchical block as well as the generic mod demod, but I found no real insight there. Obviously my lack of theoretical foundation. Perhaps this related to the low data rate of RDS, 1187.5 bps. I have the PSK demod running at 2 sps, i.e. 2375 bps. My original sample rate is about 600k. I decimate through the chain before the demod block. gnuradio version 3.8.7.1 (from memory), Ubuntu 14.04, USRP B200, 16 GB ram, i5 processor. USB3 connection. Any advice would be appreciated! Kevin
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