Ah yet another thing: make sure you don't see any "U"s on the output; those would be underruns, which might be triggered by your block not being fast enough to keep up with 30.72 million samples per second.
Best regards, Marcus On 08.06.2016 01:39, Pavan Yedavalli wrote: > Sorry, and just as an addition, obviously I could use the "Multiply > by...." blocks in GRC, but I am trying to do a much more complex loop > involving this block, so multiplying is only part of the process, and > I'm running into issues there already. Thanks. > > On Tue, Jun 7, 2016 at 4:30 PM, Pavan Yedavalli <[email protected] > <mailto:[email protected]>> wrote: > > Hi, > > I created my own block because I wanted to multiply the source > sinusoids by weights before transmitting them out, as shown in the > attached GRC diagram (my_block.png). > > However, in my work() function for the block created, I am seeing > that simply multiplying the inputs by anything (first test was > multiply by 1 and then by complex(1.0,0.0)) completely alters the > level of the signal. Multiplying by unity should not do anything, > but instead, using a spectrum analyzer, I see the signal jump up > by 30 dBm and then fluctuate up and down for some reason, using > the code below: > > def work(self, input_items, output_items): > in0 = input_items[0] > in1 = input_items[1] > out0 = output_items[0] > out1 = output_items[1] > > out0[:] = [x * 1 for x in in1] > out1[:] = [x * 1 for x in in1] > > #did this afterward > #out0[:] = [x * complex(1.0,0.0) for x in in1] > #out1[:] = [x * complex(1.0,0.0) for x in in1] > > return len(output_items[0]) > > When I don't multiply the inputs by anything, using the code > below, the signal stays stable: > > def work(self, input_items, output_items): > in0 = input_items[0] > in1 = input_items[1] > out0 = output_items[0] > out1 = output_items[1] > > return len(output_items[0]) > > Since my intent is simply to multiply the signal by some complex > weights (eventually), I'm not sure what I am doing wrong here. > Something is clearly wrong with how/what I'm multiplying, and I > don't think I am understanding. Please keep me posted. Thank you > so much for the help! > > -- > Pavan > > > > > -- > Pavan > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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