I have a two-channel signal conditioning block based on noc_block_addsub between the radio and a DDC. The entire flowgraph is radio(2 channels out)->addsub(2 channels in and out)-> two separate ZMQ Push Sinks. I'm using the DDC as an integrator/decimator because a pair of FIRs or moving average blocks followed by a pair of keep-one-in-n blocks won't fit on the FPGA image. Those streams are intercepted on the host side and displayed. The system works as intended until I try to change the frequency with the XMLRPC client, or if I even include the provision for changing the frequency in the block on the host side. Most of the time (but not always) the two channels go out of sync by at least one sample until I reset the program on the E310 side. I don't think that the radio itself is capable of sending the two channels out of sync so the issue must be somewhere in the addsub block. Peeking at the debug file suggests that the system is trying to change the channel frequencies independently. I wonder if that's the issue, and something like a timed command would help. Any ideas?
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